Avalanche Activity

Northern Madison
Big Sky Resort
Skier triggered wind slab, Big Sky
Big Sky Resort
SS-ASu-R2-D1.5-O
Caught: 0 ; Buried: 0
 
"Today a partner and I dropped in on a  ne facing chute just out of big resort boundry,  1 by 1 we both put a series of cuts in  the top half of the chute, which had about a foot of snow on top of a firm surface, the snow was  slightly wind  affected but not firm or slabby feeling. As we advanced we discussed another series of slope cuts was smart as we approached the second rollover. My partner again dropped first lightly cutting the slope, when he reached a safe spot under some rocks and away from the rollover. Next  I delivered some hard slope cuts and on my first I cut loose  a 7ft acrossx5ft about 12-14in deep chunk of soft slab which then triggered a slab just below about 40ft across x20 same depth which continued the second half  of the chute. We did not go out thinking there's gonna be slabs and we will deal them, we we're on our toes thats what kept us from going for a ride but  I would say a bad situation to get in. The runout was clean and the debris seemed not to be deeper than 2 ft maybe."

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Cooke City
Sheep Mountain
Partial Burial on Sheep Mtn.
Incident details include images
Sheep Mountain
SS-ASu-R3-D2-I
Elevation: 10,400
Aspect: NE
Coordinates: 45.0723, -109.9280
Caught: 1 ; Buried: 1; Killed: 0

From the email:

"At around 11 we ascended the slope north of sheep mountain and dug a pit at around 10,300’ on a NE aspect. Our pit was unresponsive. We skinned up to the summit of sheep mountain and dropped into the ENE spines directly off the summit. 3 turns into the slope, the entire 40° slope I was skiing propagated 12-18” deep and 250’ wide. I tried traversing out to skiers left to a clean slope but that slope then propagated even deeper, 18-20” and another 150’ wide. Once the larger slab started pulling my tips down I tried to point my skis downhill to gain some control and steer off the slope. Near the bottom of the face I had traversed onto there was a couple rocky outcroppings that I had to turn around, and the force of the liquid soft slab took me off my feet. I deployed my airbag pack, got hit with a couple waves of snow, and ended up on top with my skis and upper body/airbag above the snow. My partner above me had eyes on me for the entirety as well as a large group of sledders nearby, but it was still a scary experience. The bed surface was a hard crust that was not as obvious on the slightly more north aspect."


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Northern Gallatin
Elephant Mountain
Wind slab on Elephant
Incident details include images
Elephant Mountain
SS-ASc-I
Elevation: 9,500
Aspect: N
Coordinates: 45.4401, -110.9890
Caught: 0 ; Buried: 0; Killed: 0

From an email: "...went up the Ribbon on the north shoulder of Elephant Mountain.  Overall found a pretty stable snowpack, but did find some reactive layers where it had been wind loaded.  Attached picture was near the top where the wind was loading the upper bowl of the chute off the ridge line.  There was a variable 1-4” thick windslab that broke and propagated easily on the denser snow below."


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Cooke City
COOKE CITY
Small, deep avalanche near Cooke City
Incident details include images
COOKE CITY
SS-AMu-R2-D1.5-O
Caught: 0 ; Buried: 0

Avalanche was triggered by fifth rider on the slope (2/19/2019). Avalanche broke 2-6' deep, 50 ft wide.


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Lionhead Range
Lionhead Ridge
Large Avalanche, Lionhead Range
Incident details include images
Incident details contain video
Lionhead Ridge
HS-AM-R3-D2.5-G
Elevation: 9,000
Aspect: NE
Coordinates: 44.7135, -111.3160
Caught: 0 ; Buried: 0; Killed: 0

The crown on this slide ranges from 4-6' deep. It occurred on a heavily wind loaded slope and broke on facets near the ground. It's a clear reminder that large avalanches are possible in the mountains near West Yellowstone.  Photo: GNFAC


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Northern Gallatin
Hyalite - main fork
Skier-triggered soft slabs in Hyalite
Incident details include images
Hyalite - main fork
SS-AS-R1-D1-I
Elevation: 9,000
Aspect: NE
Coordinates: 45.4879, -110.9810
Caught: 0 ; Buried: 0

Skiers reported triggering soft wind slabs in Hyalite on NE aspect at 9000'. Photo: T. Chingas


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Southern Madison
Ernie Miller Ridge
Naturals on Ernie Miller
Incident details include images
Ernie Miller Ridge
SS-N-R3-D2-O
Elevation: 9,200
Aspect: SE
Coordinates: 44.9464, -111.1350
Caught: 0 ; Buried: 0; Killed: 0

Two large avalanches on Ernie Miller ridge. One failed in thin trees, the other was the second time the bowl had slid large this season. Photos: F. Madsen


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Cooke City
Crown Butte
Avalanche on Crown Butte
Incident details include images
Crown Butte
HS-R1-D2-G
Coordinates: 45.0520, -109.9590
Caught: 0 ; Buried: 0; Killed: 0

This avalanche on Crown Butte failed after multiple sleds had crossed the slope. From the email: "This one broke about 10 minutes after we’d been sledding below and across it. You can see our tracks going into it. Spooked us. The crown up top looked pretty deep, maybe 3 or 4 ft". Photo: S. Strenge


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Southern Gallatin
Specimen Creek
Large collapses in S. Gallatin
Specimen Creek
Caught: 0 ; Buried: 0

From an email: " While skinning...we felt many large collapses in shallow, wind-affected snow. On the ridge crest, we found a ~3cm crust on the surface with massive (~6mm+), striated facets underneath. After skiing down an east-facing, 400', low angle slope, we felt a large collapse that traveled at least 60 feet, but continued rumbling for several seconds and may have propagated back up the slope that we skied. The collapse was triggered in shallow snow in the flats. This weak snow structure near the surface was not present in the next drainage east."


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Southern Madison
McAtee Basin
Snowmobile triggered Avalanche near Buck Ridge
Incident details include images
Incident details contain video
McAtee Basin
HS-AMu-R2-D2-O
Elevation: 9,600
Aspect: NE
Coordinates: 45.1731, -111.4450
Caught: 0 ; Buried: 0; Killed: 0

Snowmobile - triggered avalanche in the McAtee Basin area near Buck Ridge. The avalanche was triggered unintentionally from the runout zone and propagated all the way up to the ridge above the riders. Luckily, nobody was caught or buried. Photo: J. Stoner


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Southern Madison
Buck Ridge
Snowmobile-triggered avalanche on First Yellowmule
Incident details include images
Incident details contain video
Buck Ridge
HS-AMu-R3-D2-O
Elevation: 9,300
Aspect: SE
Coordinates: 45.1595, -111.3350
Caught: 0 ; Buried: 0; Killed: 0

This avalanche failed on the ground up on Buck Ridge near the First Yellowmule. It was human-triggered, but nobody was caught or buried. Photo: N. James


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Cooke City
Miller Ridge
Natural Avalanche on Miller Ridge
Incident details include images
Incident details contain video
Miller Ridge
SS-N-R3-D2-I
Elevation: 9,700
Aspect: NE
Coordinates: 45.0425, -109.9650
Caught: 0 ; Buried: 0

We saw this avalanche from the groomed trail to Daisy Pass. It looked as though it was triggered by snow sluffing off the cliffs. It seems to be confined to the new snow from this week.


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Bridger Range
The Throne
Skier-Triggered Avalanches at the Throne
Incident details include images
The Throne
SS-ASc-R2-D2.5-I
Elevation: 8,400
Coordinates: 45.8821, -110.9520
Caught: 0 ; Buried: 0; Killed: 0

Skiers reported intentionally triggering multiple avalanches failing up to a foot deep at the Throne. From the email: "We dug a pit above the top of the throne (ENE aspect, 8400’, 28°) and got an ECTP17. The pit broke below 55cm of new snow, on top of an old wind slab. Bailed on our objective (the ruler) and skied the main ESE chutes on the throne. Ski cut the top of all 3 chutes and got them all to break out 8-12” deep, 100-200’ wide and they all ran 500-700’ into the trees at the bottom of the gullies. The runout hit the trees at the bottom with enough force to snap 3” trees and piled up debris up to 5’ deep." Photo: M. Cohen


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Southern Madison
Taylor Fork
Small snowmobile triggered slide, Taylor Fork
Incident details include images
Taylor Fork
SS-AM-R1-D1-O
Elevation: 8,800
Caught: 0 ; Buried: 0
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Cooke City
COOKE CITY
Natural Avalanche near Cooke City
Incident details include images
COOKE CITY
N-R2-D2-I
Elevation: 9,400
Aspect: SE
Caught: 0 ; Buried: 0; Killed: 0

This avalanche failed naturally sometime between Feb 13-15 after recent wind and storm loading. SE aspect, 9400 ft elevation, 2-4' deep. Photo: B. Fredlund


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Bridger Bowl
Fresh Soft slabs, Big Sky and Bridger Ski Patrols
Bridger Bowl
Caught: 0 ; Buried: 0

Soft slabs 6-12" deep triggered during control work. 


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Southern Madison
Taylor Fork
Large natural avalanche, Taylor Fork
Incident details include images
Incident details contain video
Taylor Fork
C-R2-D2-O
Elevation: 8,800
Caught: 0 ; Buried: 0
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Northern Madison
Beehive Basin
Natural activity in Beehive
Incident details include images
Beehive Basin
SS-N-R2-D1.5
Caught: 0 ; Buried: 0

On Saturday (2/16) skiers in Beehive observed "Lots of natural avalanches from Friday nights snow. Notice the large cornice sections at the base of the slope. We were impressed with the size of the cornices on the ridge. We noted no collapsing or cracking on the skin up or ski down."


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Cooke City
Henderson Bench
Deep slab on Henderson
Incident details include images
Incident details contain video
Henderson Bench
HS-NC-R3-D3-O
Elevation: 10,200
Aspect: NE
Coordinates: 45.0524, -109.9440
Caught: 0 ; Buried: 0

Forecaster Note: We saw this crown at 1545 on 2/15/19 after viewing this slope at least twice earlier in the day. We went to the avalanche on 2/16. It appeared to be triggered by a cornice fall and broke 4-8' deep.


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Cooke City
COOKE CITY
Small fresh slabs near Cooke
Incident details include images
COOKE CITY
SS-AMc-R1-D1-S
Elevation: 9,000
Coordinates: 45.0260, -109.9310
Caught: 0 ; Buried: 0

Saw natural slabs in the cliffs on Mineral peak south of Silver Gate and triggered a few small test slopes. 6-12" deep. 10-30' wide.


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Centennial Range
Hellroaring Creek
Natural avalanche near Hellroaring Hut
Hellroaring Creek
SS-N-S
Elevation: 8,700
Aspect: W
Caught: 0 ; Buried: 0

e-mail from folks staying at Hellroaring Hut: "...we saw the west facing slope above the Hut around 8700’?? had a new slide with a 2-3 foot crown, possible 200 yards in length running up and over a ridge. "


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Cooke City
Mineral Mountain
Small natural avalanches near Cooke
Incident details include images
Mineral Mountain
SS-N
Coordinates: 45.0297, -109.9980
Caught: 0 ; Buried: 0
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Out of Advisory Area
Other place
Snowmobile Triggered Slide - Gravelly Range
Incident details include images
Other place
HS-AMu-R3-D2.5
Caught: 1 ; Buried: 0

A large snowmobile triggered avalanche in the Gravelly Range (Outside of advisory area) on February 10th, 2019.

From email: "One rider was involved in the incident and was fortunate to be on the upper left side of the bowl when he saw the slide start. ... the crown was about 325 wide and varied in depth from 1 to 4 or 5 feet.  The ridge line was wind loaded and this was an issue we had discussed as a group and wanted to avoid.  We had read the reports for the day and knew that wind loading as well as a persistent week layer were both concerns. .... The rider involved entered the area from around where the road switchbacked and did not realize what was above him due to reduced visibility."


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Southern Gallatin
Specimen Creek
Collapsing in Specimen Creek
Specimen Creek
SS
Caught: 0 ; Buried: 0

From e-mail: " Large collapses on any slope with HS of <1m, one pit at 7500 on W aspect and 19 degrees HS 100 cm, yielded ECTP22 sudden collapse on advanced depth hoar 45cm from the ground. Overall just terrible structure. We had collapsing on both E and W aspects. Large shooting cracks. No other avalanche activity apart from large slide on Ernest Miller from several days ago."


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Cooke City
Mt. Abundance
Snowmobile triggered on Mt. Abundance
Incident details include images
Mt. Abundance
HS-AMu-R3-D2.5-O
Elevation: 9,900
Aspect: S
Coordinates: 45.0681, -110.0150
Caught: 0 ; Buried: 0

Avalanche triggered by snowmobiler on 2/9/19 on south face of Mt. Abundance near Cooke City (9,500’). One rider was on the slope and another was at the bottom. Both were able to get out of the way and not caught.


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Northern Gallatin
Mt Blackmore
Skier triggered on Mt. Blackmore
Mt Blackmore
HS-ASr-R2-D2.5
Elevation: 10,000
Aspect: E
Coordinates: 45.4440, -111.0030
Caught: 0 ; Buried: 0

From e-mail: "Reporting avalanche on Mt Blackmore, east face. I a skier, remote triggered a wind slab avalanche from about 300 feet above I while skiing the face. I was the 2nd skier. Crown was slightly below ridge line ranging from 6 inches to 2 feet. After noticing the slab breaking under my feet I skied right to safely. Avalanche traveled ~700 feet. Elevation ~10,000 feet."


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Northern Gallatin
Mt Blackmore
Avalanches on Mt. Blackmore
Incident details include images
Mt Blackmore
N-R2-D2
Aspect: E
Coordinates: 45.4445, -111.0000
Caught: 0 ; Buried: 0

From an email, "Lots of wind slab activity... tough to tell exactly what happened here with everything filling back in so fast. A few quickly-disappearing crowns on ridge line and throughout E face, good debris pile."


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Northern Madison
Beehive Basin
Cracking on wind slabs in Beehive
Incident details include images
Beehive Basin
Coordinates: 45.3267, -111.3870
Caught: 0 ; Buried: 0

Skiers got 4-6" wind pockets to propagate in the trees at lower elevations in Beehive Basin. Wind slabs were thicker in more exposed areas and likely more reactive at higher elevations.


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Centennial Range
Centennials - Idaho
Snowmobiler caught and buried in Centennials
Incident details include images
Centennials - Idaho
SS-AMu-R2-D2-O
Caught: 1 ; Buried: 1

This was shared with me from one of our Fremont County Search & Rescue members. I have no further information.

Video URL

https://www.facebook.com/nate.nygard.5/videos/2347244235309969/


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Lionhead Range
Lionhead Ridge
Snowmobile triggered at Lionhead
Incident details include images
Incident details contain video
Lionhead Ridge
HS-AMu-R3-D2.5-O
Elevation: 9,000
Aspect: E
Caught: 0 ; Buried: 0
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Southern Madison
Taylor Fork
Collapse south facing slope Taylor Fork
Incident details contain video
Taylor Fork
Caught: 0 ; Buried: 0

Large collapse on facets near the ground. The snowpack on this slope was less than 3' deep. 


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Centennial Range
Centennials - Idaho
Natural Avalanche on Sawtelle Peak
Incident details include images
Centennials - Idaho
Coordinates: 44.5609, -111.4400
Caught: 0 ; Buried: 0

From an email, "Observed this large avalanche while driving north from Jackson Hole today.  (on the E, NE aspect of Sawtell Peak, in the Centennial Mountains)"

Likely released in the last day or so with the Avalanche Warnings on Sun, Mon and Tuesday.


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Lionhead Range
Lionhead Ridge
Natural avalanches at Lionhead
Incident details include images
Incident details contain video
Lionhead Ridge
SS-N-R2-D2
Elevation: 9,000
Caught: 0 ; Buried: 0

GNFAC forecasters' observation: On 2/8/19 we observed 3 recent avalanches with unknown triggers (assumed natural) and one snowmobile triggered avalanche (listed separately as AMu on 2/6/19) along Lionhead Ridge. Three of them, including the snowmobile triggered slide, broke 3-4+ feet deep on sugary weak snow in the lower 1/3 of the snowpack. One avalanche broke 2' deep in the recent storm snow.


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Southern Madison
Bacon Rind
Collapse, cracking, and avalanche in distance at Bacon Rind
Incident details include images
Bacon Rind
SS-N-R2-D2
Elevation: 9,600
Aspect: NE
Coordinates: 44.9428, -111.1360
Caught: 0 ; Buried: 0

From an email, "My partner and I skied up bacon rind with plans on skiing the <30 degree run on the east face of Ernest miller ridge. On our way out there we had a large collapse, and saw shooting cracks.  We dug a pit at 9,150 ft on a E facing slope and got a ECT P16Q1 about 90 cm down.  Before this off in the distance (photo) we saw a massive avalanche in a 35 degree wind loaded NE slope at 9,600. It appeared to be about 1 - 1.5 m deep and 100 ft across."


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Cooke City
Pebble Creek - YNP
Collapsing Cooke City, Pebble Creek
Pebble Creek - YNP
Coordinates: 45.0389, -110.0220
Caught: 0 ; Buried: 0

From an email, "Performed a stability test on a South facing slope, 9400', 190HS, Ectp21, SC 85 cm deep on MFcr rounding facets. We had a very large collapse while in pit and a few others on the climb out. No other signs of instability or avalanches were seen in the Pebble Creek region today."


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Cooke City
Daisy Pass
Snowmobile triggered near Daisy Pass
Incident details include images
Daisy Pass
SS-AMu-R3-D2-I
Elevation: 9,900
Aspect: SW
Caught: 1 ; Buried: 0

Riders reported cutting across this slope and then an hour later a different snowmobiler triggered it. It was a couple hundred feet wide and debris stopped just above groomed trail. The rider that triggered it was caught and deployed his airbag and able to escape, but his sled was towed back to town.


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Cooke City
Rasta Chutes
Large collapse, Cooke City
Incident details contain video
Rasta Chutes
Caught: 0 ; Buried: 0
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Lionhead Range
CENTENNIAL RANGE
Multiple large avalanches in Centennials and Lionhead
Incident details include images
CENTENNIAL RANGE
SS-N-R3-D2.5-O
Coordinates: 44.5394, -111.5130
Caught: 0 ; Buried: 0

From e-mail on 2/1/19: "The Reas Peak area had 7 slides that I could see from the bottom of the drainage, most of them looked to have occurred with the last storm and had a northerly influence to their aspect. The largest and most recent slide I included in the [above photo], Reas Peak is the highest peak on the left in the photo and the slide path is on a NE aspect. If you look close at the photo you can see a 2-3’ crown on the far left side of the frame on the north aspect of Reas from another slide."

Another observer saw a large slide near Lionhead (photo) and one on Reas Peak from the same cycle.


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Northern Madison
Cedar Mtn.
Natural Avalanche on Cedar Mountain
Incident details include images
Cedar Mtn.
Aspect: NE
Coordinates: 45.2981, -111.5240
Caught: 0 ; Buried: 0

This natural avalanche was seen on a NE aspect of Cedar Mountain today (29 January).


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Northern Gallatin
Hyalite - main fork
Natural avalanches up Hyalite
Incident details include images
Hyalite - main fork
SS-N-R3-D3
Coordinates: 45.4131, -110.9840
Caught: 0 ; Buried: 0

Two slides, one on Alex Lowe Peak, and another in Maid of Mist Basin:

1. "Newish slide with a fresh looking debris pile. Between Alex Lowe and Peak 9806. Appeared to step down into the old snow. Looked like a D2.5-R3, natural trigger."

2/3. "Large natural avalanche on the south face of peak 10,201. Looked to be a day or two old and the crown looked to be 3-4 feet deep in places."


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Northern Gallatin
Mt Blackmore
Natural Avalanche Mt. Blackmore
Incident details include images
Mt Blackmore
SS-N-R2-D2-I
Caught: 0 ; Buried: 0

Natural avalanche observed on January 28th.

From email: "Fresh natural on east face of Blackmore in gently wind-loaded terrain."


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Cooke City
Mt. Zimmer
Natural avalanches on Mt. Zimmer
Mt. Zimmer
HS-N-R3-D2-O
Coordinates: 45.1172, -109.8920
Caught: 0 ; Buried: 0; Killed: 0

From the email: "Two slab avalanches that looked a day or two old. Both East/NE aspect off of Mount Zimmer. One was storm snow/windslab 12'18" crown that ran 300' wide, D1.5/R3 and the other was a small width deep slab in a pocket below cliffs. 4-5'crown, 50'wide, D2/R1." 


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Northern Madison
Big Sky Resort
Deep Slab Avalanche at Big Sky
Big Sky Resort
HS-AEc-R4-D3-O
Caught: 0 ; Buried: 0

Big Sky Ski Patrol triggered a deep hard slab avalanche during control work on January 28th, breaking on a weak layer of facets that formed in early December.

From email: "This slide failed on our layer of greatest concern and had recently been loaded up with 60cm of 1F wind slab from our consistent snowfall over the past 11 days. Crown depth ranged from 3-5’ and consensus is that it was about 300’ wide. " - BSSP


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Northern Madison
Fan Mountain
Natural Avalanche on Fan Mountain
Incident details include images
Fan Mountain
SS-N-R2-D2.5
Caught: 0 ; Buried: 0

Natural avalanche on Fan Mountain. Observed on the morning of January 28th, 2019.


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Lionhead Range
Sheep Mountain
Natural Avalanche on Sheep Mountain
Incident details include images
Sheep Mountain
HS-R2-D2
Aspect: S
Caught: 0 ; Buried: 0

A very deep natural avalanche was observed on Sheep Mountain, on January 28th. 

From email: "This was southern facing slope of sheep mountain... Crown was at least 8’... very heavy wind loading."


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Out of Advisory Area
Black Butte- Gravelly Range
Remote triggered near Black Butte
Incident details include images
Black Butte- Gravelly Range
SS-AMr-R3-D2-G
Coordinates: 44.9045, -111.8560
Caught: 0 ; Buried: 0; Killed: 0

Snowmobilers reported triggering multiple avalanches from low slope angles between West Fork and Black Butte in the Gravelly Range. Photo: S. Olson


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Lionhead Range
LIONHEAD AREA
Cracking and Collapsing in Henry's Mountains
Incident details include images
LIONHEAD AREA
Coordinates: 44.6641, -111.3560
Caught: 0 ; Buried: 0; Killed: 0

Cracking and collapsing on a 31-degree slope near the Lionshead area down south. The slab was 3-4' deep, and the slope was on the verge of being steep enough to avalanche. From the email: " fractured about 20’x10’ area initially, maybe 3-4’ deep. We got off the hill and it continued to fracture in bigger spots but did not slide more than a foot total." Photo: S. Thompson


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Southern Madison
Beaver Creek
Natural Avalanches Beaver Creek
Beaver Creek
N
Caught: 0 ; Buried: 0

From email: "we ... observed several natural avalanches in the long, steep gullies on the west side of Beaver Creek."


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Northern Gallatin
Hyalite - main fork
Naturals, collapsing, propagating - Main Fork Hyalite
Hyalite - main fork
N
Coordinates: 45.4588, -110.9570
Caught: 0 ; Buried: 0; Killed: 0

A group of skiers observed propagation in their stability tests and experienced collapsing in the main fork today. A separate group of ice climbers heard two different natural avalanches and observed active wind loading at higher elevations. A climber from a third group watched a natural avalanche next to the Mummy. 


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Northern Gallatin
Mt Ellis
Skier Triggered Avalanche Mt. Ellis
Incident details include images
Mt Ellis
SS-ASu-R2-D2-O
Elevation: 7,500
Aspect: NE
Coordinates: 45.5829, -110.9540
Caught: 0 ; Buried: 0; Killed: 0

Skiers triggered this avalanche in dense trees while ascending Mt. Ellis. From the email: "While subsequently skiing up through dense trees climbing to the north to attempt to reach the mid section of the going-home chute, a medium-size bowl-shaped opening in the trees released a soft slab just as we were entering the opening. The crown was ~24” deep and ~80-100’ across. Total snow depth in that area was less than three feet. The avalanche ran probably 500 vertical feet down a shallow gully. Neither my partner nor I where caught but way too close for comfort."


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Bridger Range
Truman Gulch
Natural Avalanche on the West Side, Bridgers
Incident details include images
Truman Gulch
N-R3-D2-O
Elevation: 7,400
Aspect: N
Coordinates: 45.8077, -110.9460
Caught: 0 ; Buried: 0; Killed: 0

Bridger Bowl Ski patrol snapped a photo of this natural slab avalanche on the west side of the Bridgers near Truman Gulch. Photo: BBSP


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Out of Advisory Area
Arrastra Creek
Natural slides near Emigrant
Incident details include images
Arrastra Creek
SS-N-D2.5
Aspect: SE
Caught: 0 ; Buried: 0; Killed: 0

Skiers reported multiple large natural avalanches in the Arrastra drainage in the Absarokas. They estimated the recent storm cycle totals to be 3-5'.

From e-mail: "We observed a rather large natural slide come down within a 100' of us as we were beginning our ascent in some thick old-growth Douglas Fir woods next to the terminus of a large south-facing gully/slide path.

we knew there was a party of at least two above us.  I quickly put my beacon in search mode and scanned the toe of the debris.  No signals.  We separated by a safe distance and I led up the skin track which bordered the lower 400' of the debris field with my beacon in search mode.  No signals.  At 400' up the Arrastra Road crosses the path.  At this point my partner and I met up. I crossed the debris angling downhill to the west continuing to search for any potential signals.  No signals.  I skinned up the remaining west border of the path in search mode.  Back at the road I finally heard and saw the other party of 3 come out of the woods above us.  Very relieved we were.  They thanked us for our concern and we all descended and left for the day.

Since last Friday I would realistically say that 3'-5' of new snow had accumulated.  I'd been in here Mon.-Fri. this week and aside from Tuesday it had been snowing at high rates at all times.

This particular path had slid to within 300' of the upper road around New Year's. It is a south facing path with two distinct gullies and runs from just under 10000' down to 7600'.

Quite a few other large crowns were observed higher in the bowls, mostly being confined to storm snow.  But I'm sure some were failing on PWLs at the ground and within the snowpack."


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Bridger Range
BRIDGER RANGE
Big Natural Avalanches in the Bridgers
Incident details include images
BRIDGER RANGE
HS-N-R3-D2.5-O
Elevation: 8,200
Coordinates: 45.8486, -110.9460
Caught: 0 ; Buried: 0; Killed: 0

Skiers in the Bridgers saw multiple large natural avalanches in the Bridgers that had released during recent snow and wind loading. From the email: "Looks like things really went off in the Bridgers in the last few days. Loads of natural avalanche activity, much of it appearing to fail on deeper layers than the new/old interface." Photo: B. VandenBos


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Southern Madison
Sunlight Basin
Remote Triggered at Sunlight Basin (Taylor Fork)
Incident details include images
Incident details contain video
Sunlight Basin
SS-AFr-R2-D2-O
Elevation: 9,500
Aspect: SE
Coordinates: 44.9756, -111.3130
Caught: 0 ; Buried: 0; Killed: 0

We triggered these avalanches remotely, about 50 feet above the crown up on the ridge. Each crown was 1-2' deep, 100' wide, and both slides ran between 200 and 300 vertical feet through trees and cliffs. The slides failed on a 40 cm thick layer of depth hoar, which composed half of the snowpack. Photo: GNFAC


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Northern Madison
Big Sky Resort
Large Deep Slab Avalanche at Big Sky
Big Sky Resort
HS-AEc-R4-D3.5-G
Coordinates: 45.2780, -111.4500
Caught: 0 ; Buried: 0; Killed: 0

Big Sky Ski Patrol triggered a large deep slab avalanche during control work this morning, with a crown depth up to 10 feet deep. From the e-mail: "This is generally one of our most heavily wind loaded areas on the mountain with any wind with a westerly component.   It ran on a combo of ground and an ice crust that was sitting in a recessed area, probably leftover October snow.  Crown depth ranged from 10’ near the cornice but quickly tapered to an average of 3-5’." -BSSP 


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Bridger Range
The Throne
Northern Bridgers Avalanche
Incident details include images
The Throne
SS-AFu-R3-D2-O
Elevation: 7,600
Aspect: NE
Coordinates: 45.8745, -110.9500
Caught: 1 ; Buried: 0; Killed: 0

A skier unintentionally triggered a slab avalanche in the northern Bridgers. The group did not notice any avalanche activity on the snowmobile ride in to the zone. They dug a pit and found poor snow structure and propagation in the new snow layer in stability tests. From the email: "About halfway up my hike I heard a wumpf and started getting carried down. I was carried about 90 yards, I got fully buried for the middle 30 yards but finally surfaced and came to a stop. My two friends were on their sleds over to the side of the face and had eyes on my the whole time. We all had the proper equipment but luckily didn’t need to use it. The crown broke about 20 yards above me, looked about 3.5 ft deep, it went across the 40 yard wide couloir and continued down and around some cliffs another 20 yards." Photo: C. Histon


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Bridger Range
Wolverine Bowl
Avalanches North of Bridger Bowl
Incident details include images
Wolverine Bowl
SS-N-R2-D2.5-I
Elevation: 7,500
Aspect: NE
Coordinates: 45.8348, -110.9340
Caught: 0 ; Buried: 0; Killed: 0

A group with the MSU advanced avalanches class found multiple slab avalanches that released at various times during this week's storm. Three of the slides ran for a large portion of their slide path. One avalanche was large enough to break small trees in the slide path. Ski tracks nearby suggest this avalanche was skier-triggered. Photo: A. Schauer


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Northern Madison
Deer Creek
Large Collapses in Deer Creek Drainage
Incident details include images
Deer Creek
AS
Elevation: 7,400
Coordinates: 45.3016, -111.2070
Caught: 0 ; Buried: 0

From the email: "We experienced many small, localized collapses below 7400'. Above 7400', the collapses/ whumphing were much larger (propagating far) and louder. We had two occasions where one of us triggered a whumph from 150+ feet away and the other person (standing still) felt and hear it. Dug two pits: first one on S aspect at 7600' got ECTP14 49 cm down on facets below a melt freeze crust. Second pit (E aspect, 8130 feet) got ECTP13 down 78 cm on 2-3 mm facets" - A. Alloway


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Northern Madison
Cedar Mtn.
Snowmobile triggered avalanche near Cedar
Incident details include images
Cedar Mtn.
SS-AMu-R3-D2
Elevation: 8,600
Aspect: NE
Coordinates: 45.2279, -111.4890
Caught: 0 ; Buried: 0

From YCSP: "One of our patrollers spotted a snowmobile triggered avalanche on Cedar Mountain this afternoon. The patroller reported a track entering and exiting the path. The slope was NE facing at approximately 8,600’. It was difficult estimating the dimensions of the slide as the visibility was limited and we were quite a ways from the avalanche."


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Northern Gallatin
Lick Creek
Lick Creek Avalanche
Incident details include images
Lick Creek
SS-ASc-R2-D2-I
Elevation: 8,000
Coordinates: 45.5198, -110.9500
Caught: 0 ; Buried: 0; Killed: 0

Skiers near lick creek intentionally triggered this avalanche that failed below the recent snow. From the email: "Ski cut a wind loaded soft slab on 34 degree headwall dropping into Bozeman Cr. drainage. Slope fractured and ran short ways, 100 feet from crown to toe. Crown was 75 feet across and 20 inches deep." Photo: Kenna


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Bridger Range
Battle Ridge
Cracking and Collapsing, Battle Ridge
Battle Ridge
Coordinates: 45.8823, -110.8820
Caught: 0 ; Buried: 0

Skiers near Battle ridge found poor snow structure and experienced cracking and collapsing in the snowpack. From the email: "Throughout our tour we experienced "whoomping" and cracking, some localized and some larger. Upon further inspection, the snowpack was basically new snow (making up half of the pack) and large depth hoar (the lower half of the pack) HS 50-150 depending on wind-loading. Things were most reactive in areas where cover was thinner. Snow surface was moist on solar aspects as the afternoon progressed." - C. Pruden


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Northern Madison
Red Knob
Cracking and Collapsing near Ennis Lake
Red Knob
Elevation: 8,000
Coordinates: 45.4547, -111.5920
Caught: 0 ; Buried: 0; Killed: 0

From the email: "Went to Red Knob, up Trail Creek at the northeast side of Ennis Lake. Between the two of us, we experienced 16 collapses on slopes above 7000 feet to the top at 8000. Did not dig any pits, stayed on slopes less than 30. One slope at about 30 collapsed and shifted down slope a few inches." - J. Riedel and A. Hjelt


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Northern Gallatin
Divide Cirque
Widespread Avalanching in Divide Drainage
Incident details include images
Divide Cirque
SS-NCr-R3-D2.5-O
Aspect: SE
Coordinates: 45.3903, -110.9690
Caught: 0 ; Buried: 0; Killed: 0

A skier in Hyalite reported widespread avalanche activity in the Divide drainage. From the email: "Saw this set of crowns just to the looker's left of Divide Peak proper.  Appear to be cornice triggered, I suspect they all released sympathetically, maybe sometime yesterday.  Impressively connected, definite PWL issue. SE aspect. Crowns spanned nearly 1/2 mile of terrain." Photo: B. VandenBos


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Out of Advisory Area
Other place
Large avalanche on low angle near Livingston
Incident details include images
Other place
SS-R3-D2
Elevation: 9,000
Aspect: NE
Coordinates: 45.6042, -110.4890
Caught: 0 ; Buried: 0

From text: "this one was interesting because it was so low angle and in quite tight trees. We were in a zone south of Livingston today (1/26/19), near 9k’, NE aspect in dense timber not far from a ridge top. The slide may have been remote triggered by us skinning up or a large wind gust that came from the other side of ridge. We were touring up low angle terrain and had multiple large collapses on our ascent. We came to what was going to be our turn around point where my brother and I were discussing where we would rip skins and drop in. Before we proceeded into the timber on a 28deg slope we noticed a lot of tree bombs then saw the slide coming through the trees and taking out a couple of 10” diameter snags along the way. These trees were barely skiable due to how tight they were and the starting zone was only a hair over 30 deg. The crown we could see looked to be 3’, and 300’ wide. I’m unsure on the the distance it ran, but estimate 500-800 vertical ft. The main point I got from this slide was that we were crowding connected terrain, things are sliding at the very relaxed end of the slope spectrum, and don’t be lulled into a false sense of security in fairly dense timber."


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Bridger Range
Frazier Basin
Avalanches, Poor Stability in Frazier
Frazier Basin
L-N
Elevation: 7,600
Coordinates: 45.9236, -110.9770
Caught: 0 ; Buried: 0; Killed: 0

Skiers in Frazier Basin found poor stability, noting multiple debris piles from recent avalanches and propagating test results (ECTP27). 


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Northern Gallatin
Wheeler Mountain
Another Avalanche on Wheeler
Incident details include images
Wheeler Mountain
SS-N-R1-D2-O
Coordinates: 45.5097, -111.0820
Caught: 0 ; Buried: 0

A skier in Hyalite noticed an avalanche on Wheeler mountain that failed on the same slope that avalanched earlier this week. Photo: G. Antonioli


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Cooke City
Hayden Creek
Hayden Creek Avalanche
Hayden Creek
HS-N-R1-D2.5-O
Coordinates: 44.9946, -109.9090
Caught: 0 ; Buried: 0; Killed: 0

"Small (compared to Climax Path) but deep avalanche on south end of Climax Path east facing Woody Ridge. Appears to have stepped down into deeper layers and looks to be natural trigger. 3-4' crown, approximately 100'wide. Steep wind loaded terrain." - B. Zavorra


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Bridger Range
Bradley Meadow
Skier triggered near Bradley's meadow
Incident details include images
Bradley Meadow
SS-ASu-R3-D1.5-S
Elevation: 7,200
Aspect: SE
Coordinates: 45.8295, -110.9270
Caught: 0 ; Buried: 0

A skier triggered this slide around two o'clock in Bradley's Meadow on 1/26. From e-mail: "The snow propagated when I made my first turn on a convex roll above the slope skiers right of the main meadow, just before the flat area before going up The Ramp. The slab broke right under my feet and propagated 20-25 feet on either side of me. The crown was 7" deep where I triggered it but some spots of it were as deep as 13". My friends and I decided that the slide was R3 and D1-D2. Luckily I was able to ski out of the slide right when it propagated so no one was caught in it."


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Out of Advisory Area
Bell Lake
Avalanche Fatality, Tobacco Roots
Incident details include images
Incident details contain video
Bell Lake
SS-ASu-R4-D3-O
Elevation: 9,000
Aspect: E
Coordinates: 45.5422, -111.9980
Caught: 4 ; Killed: 1

Four skiers were ascending a steep, heavily treed slope and triggered a large avalanche. The two skiers highest on the slope grabbed trees, and the lower two were caught and partially buried. One died from trauma at the site, and the other was air-lifted to emergency care with serious injuries. (A more detailed accident report will be available soon. Check back in a day or two.) Our deepest condolences go out the family and friends of the victim.


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Bridger Range
Saddle Peak
Natural avalanche Saddle Peak (possibly human triggered)
Saddle Peak
SS
Caught: 0 ; Buried: 0

This slide was observed by skiers near the south boundary of Bridger Bowl. The slide ran over the south end of the cliffs into the Going Home Chute. It was described as a natural by the patrol, but it could have been human triggered. 


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Bridger Range
Truman Gulch
Big Avalanches on west side of Bridgers
Incident details include images
Truman Gulch
SS-N-R4-D3-I
Elevation: 8,000
Aspect: NW
Coordinates: 45.8059, -110.9360
Caught: 0 ; Buried: 0

From the ridge late this morning (1/24) we saw multiple large crowns in Truman Gulch on the west side behind Bridger Bowl. Biggest was behind d-route (photo).

Two other slides visible today during brief break before more snow. One behind ridge north R2-D2, and one behind the patrol tow R3-D2.5. All 2-3.5’ deep, latter two not as wide. All big. Broke naturally, probably overnight after 1.6" of swe yesterday and moderate westerly winds. Photo: GNFAC


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Northern Gallatin
Hyalite - main fork
Cracking and collapsing, main fork Hyalite
Incident details include images
Hyalite - main fork
Caught: 0 ; Buried: 0

"Cracking/Whumphing observed on open east aspect at ~7300' in the main fork of Hyalite Canyon. We also observed what we suspect was a powder cloud across the canyon in the terrain above the Dribbles/Responsible Family Men around midday. It was difficult to be sure looking through the trees."


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Northern Gallatin
Mt Blackmore
New snow instabilities in Hyalite
Incident details include images
Mt Blackmore
L-N-R1-D1-I
Coordinates: 45.4471, -110.9980
Caught: 0 ; Buried: 0; Killed: 0

A skier in Hyalite reported many signs of new snow instability near Mt. Blackmore. From the email: "Widespread shooting cracks and wumphing. Lots of dry loose activity in steep terrain. I saw what I believe was a crown line near the ridge on the north face of Blackmore but it was hard to see because it was in the shade. The wind was gusty and not very consistent, so those wind affected slopes didn’t appear to have set up into harder slabs yet, but I wasn’t about to walk out there to find out!" Photo: H. Coppolillo


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Northern Gallatin
History Rock
Collapsing at History Rock
Incident details include images
History Rock
Coordinates: 45.4822, -111.0140
Caught: 0 ; Buried: 0

A skier noticed multiple collapses at History Rock, and snapped a photo of active wind loading at higher elevations in Hyalite. From the email: " Roughly 30cm new snow from the last storm, light winds, although Blackmore (pictured) and Flanders appeared to be getting hammered by the wind. Did a few laps in the top meadow and was getting frequent collapsing on the way back up. One felt like a small earthquake and was the loudest wumpf I've ever heard." Photo: M. Lavery  


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Northern Gallatin
Lick Creek
Cracking and Collapsing up Lick Creek
Incident details include images
Lick Creek
Elevation: 7,600
Aspect: NE
Caught: 0 ; Buried: 0

Skiers got collapses and cracks as they toured up Lick Creek. They reported, "1 large whumph on 26 degree NE terrain @7600’. Investigated and likely weak layer was 3-4 mm facets down 70cm with total HS 105."


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Southern Gallatin
Specimen Creek
Many collapses and cracks in Specimen Ck
Specimen Creek
Caught: 0 ; Buried: 0

Skiers touring into Specimen Creek wrote, "We got a lot of heart pounding collapses and shooting cracks."


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Bridger Range
Bridger Peak
Natural avalanches Bridger pk. through Pinnacles
Bridger Peak
SS-N-R3-D2-I
Elevation: 8,900
Aspect: E
Coordinates: 45.7772, -110.9360
Caught: 0 ; Buried: 0

Forecaster obs: This morning on drive to Bridger we saw crowns from recent avalanches almost continuously between Bridger Peak and the Pinnacles. Probably 6 paths had avalanches. 2-3’ deep across all starting zones. Estimate they ran late yesterday or this morning due to not very covered from yesterday’s snow, and crowns from Sunday on Saddle/Argentina were covered. Saddle was in a thick cloud of blowing snow. Strong wind continued all day. Moving across mid mountain later in the day. -AM


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Northern Madison
Beehive Basin
Skier triggered avalanche in Beehive Basin
Incident details include images
Beehive Basin
SS-ASu-R2-D2-I
Elevation: 9,000
Aspect: NE
Coordinates: 45.3422, -111.3970
Caught: 0 ; Buried: 0

From an email:

"Dug a pit at ~9000’ on a NE aspect, got a ECTP29 at 56cm down, breaking below the new snow and a 12cm knife-hard slab. Broke on small facets (<1mm) in between wind slabs. I marked the trigger point in red. Skinned up a low angle gully up to around 9500’. As I got near the steepest part of the gully (38°), a soft slab 12-18” thick propagated 100’ wide and slid 500’ back down to my pit. No one was caught. Contrary to my pit, this ENE aspect slid just the new snow on top of a previous wind slab. No facets on the bed surface, just new snow/old snow interface. Found safer skiing down low in the trees where there was less wind loading."


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Bridger Range
The Ramp
Small avalanche north of Bridger Bowl
Incident details include images
The Ramp
SS-R2-D1.5-I
Coordinates: 45.8271, -110.9320
Caught: 0 ; Buried: 0

"We noticed this broken slab debris en route to ski the ramp north of Bridger Bowl yesterday.  It was at the ridge line, and the crown was about 18 inches tall. It didn't slide very far, due to its lower angle (<30 degrees) and it is unclear if it slid naturally or from a skier poking over to check it out.  It was located above cliffy, high consequence terrain."

 

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Northern Gallatin
Mt Blackmore
Cracking wind drifts on Mt Blackmore
Mt Blackmore
Coordinates: 45.4441, -111.0030
Caught: 0 ; Buried: 0

From an email, " Over a foot of new snow up high with consistent NW winds.  Soft slabs where breaking anywhere from several inches midslope to a foot deep along ridgelines on a mid-storm density change in the newest snow.  We experienced cracking along ridgelines, but no collapsing while skinning in the trees or near the ridge."


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Southern Madison
Bacon Rind
Collapsing at Bacon Rind
Bacon Rind
Elevation: 8,200
Caught: 0 ; Buried: 0

From an email: "The snowpack seems to about double by the time you get into the upper meadows. We got one loud whoomph up high around 8200’."


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Bridger Range
Saddle Peak
Natural avalanche on Football Field
Saddle Peak
SS-NC-R2-D2-S
Elevation: 8,700
Aspect: E
Coordinates: 45.7977, -110.9340
Caught: 0 ; Buried: 0

Natural avalanche reported by ski patrol. Occurred around 1230. Likely cornice triggered. Strong winds blowing all day, drifting 20” of snow from the weekend. 


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Lionhead Range
Two Top
Snowmobiler triggred slide near Two Top
Incident details include images
Two Top
SS-AMr-R2-D2-I
Elevation: 0
Aspect: N
Caught: 0 ; Buried: 0

From an email:

" ...was riding with a guide group near the Two Top area and remotely triggered this slide as rode past this drainage on the top of the ridge. It was a north facing wind loaded slope in the 38 degree slope range. It broke about 12 inches deep and looked like it was from the last snow/wind loading." 


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Cooke City
Mt Republic
Natural avalanches on Mt. Republic
Incident details include images
Mt Republic
SS-N-R2-D2-I
Aspect: N
Caught: 0 ; Buried: 0

Natural avalanches in the new snow, near Cooke City, on January 21st.

From email: "avalanche crowns on the shoulder of Mt. Republic from this morning.  (saw the powder cloud at about 8:30am).  I estimate the upper crown to be 1-3' deep and about 100' wide.  Northerly facing terrain."

Photo Credit: B. Fredlund


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Northern Gallatin
Wheeler Mountain
Remotely triggered avalanche on Wheeler Mountain
Incident details include images
Wheeler Mountain
SS-ASr-D2
Coordinates: 45.5129, -111.0770
Caught: 0 ; Buried: 0

From email: "As we entered the large open meadows on the east face ... we remotely triggered a sizable avalanche from 2-300 yards away. The crown was approximately 100 yards wide, running several hundred yards downhill ... the crown appeared to be about 2 feet deep."


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Northern Gallatin
Hyalite - main fork
Ice climber triggered slide in Hyalite
Incident details include images
Hyalite - main fork
SS-AFu-D1-I
Caught: 0 ; Buried: 0

Small avalanche 70m up "The Dribbles" ice climbing route in Hyalite.

From email: "Some super heavy wind loading as the slope flattened out.... as he set up the anchor 70m up the climb a small slab came off just to his left." 


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Bridger Range
Argentina Bowl
Natural avalanche in Argentina Bowl
Incident details include images
Argentina Bowl
SS-N-R2-D2-U
Elevation: 8,600
Aspect: E
Coordinates: 45.7874, -110.9360
Caught: 0 ; Buried: 0

Forecaster note: From road on drive back from the Throne/northern Bridgers we saw a series of large, R2-D2 avalanche crowns (overlapping) on lookers left of center Argentina Bowl below cornices, near steep rocky cliffs in center. Used binoculars to confirm. 


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Northern Gallatin
Lick Creek
Cracking and whumphing, Lick Ck
Lick Creek
Elevation: 6,600
Aspect: E
Coordinates: 45.5128, -110.9190
Caught: 0 ; Buried: 0

From e-mail: "Noted shooting cracks and whumpfing on an east facing aspect while skiing from Bozeman creek into wild horse and lick creek. This did occur on a forest service road cut at about 6600ft. Also, we didn’t get any propagation in our snow pits. ECTN15"


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Bridger Range
Saddle Peak
Skier/cornice triggered south summit of Saddle Peak
Saddle Peak
SS-NC-R1-D2
Coordinates: 45.7935, -110.9360
Caught: 0 ; Buried: 0

Forecaster note: From road on drive down at 1400. Used binoculars to confirm. Saw skier/cornice triggered slide off south summit of Saddle Peak. looked like it ran down the south-central chute 1/3-1/2 way, but visibility was hard to confirm. May have gone farther. Didn't propagate wide. looked like within new snow. kind of a large volume loose snow slide. R1-D2.


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Bridger Range
Saddle Peak
Large natural on NE face of Saddle Peak
Saddle Peak
SS-N-R2-D2.5-I
Elevation: 9,000
Aspect: NE
Coordinates: 45.7946, -110.9360
Caught: 0 ; Buried: 0

Caller reported: A natural avalanche ran down the main gut of the northeast face of Saddle Peak. Full track about 2000'. Half way down it propagated out 200-300' wide. Ran over cliffs into 'going home chute' and over lower traverse out from ski area boundary. 18-20" deep new snow. Nothing stepped down into older layers.


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Southern Madison
Sunlight Basin
Cracking and whumphing in Sunlight Basin
Sunlight Basin
AS
Coordinates: 44.9749, -111.2940
Caught: 0 ; Buried: 0

From e-mail: "We toured for 2 days in the sunlight basin area south of the Taylor fork. High winds and sugary snow were the norm. We observed whumph-ing and large shooting cracks on our low angle (less than 20 degree) skin track on multiples slopes and aspects. A person easily sinks to their waist when stepping off their skis."


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Cooke City
Scotch Bonnet
Avalanche and cracking, Cooke City
Incident details include images
Incident details contain video
Scotch Bonnet
Elevation: 10,000
Aspect: S
Coordinates: 45.0722, -109.9480
Caught: 0 ; Buried: 0

GNFAC Field observation

Avalanche, Chimney Rock, NW facing slope. From Daisy Pass we could make out fresh debris at same elevation as us. Could not see the crown, but upper slopes were rocky, thin and likely faceted. Visibilty was not good.

Cracking, Scotch Bonnet: We skied up a south facing slope to 10,000 and had shooting crackings in the new, wind drifted snow. The new snow is not bonding well to the old snow surface and it is breaking where it has been blown into slabs.


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Bridger Range
Frazier Basin
Skier triggered in Frazier Basin
Incident details include images
Frazier Basin
SS-ASr-R2-D1.5-I
Aspect: NE
Coordinates: 45.9227, -110.9750
Caught: 0 ; Buried: 0
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Southern Madison
Telemark Meadows
Collapsing in southern Madison
Telemark Meadows
Coordinates: 44.8703, -111.0510
Caught: 0 ; Buried: 0

From e-mail: "We rode Telemark Meadows yesterday and got a lot of collapsing under our skis."


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Bridger Range
Saddle Peak
Skier triggered slides on Saddle Peak
Saddle Peak
SS-AS-R2-D1.5-I
Elevation: 8,900
Aspect: E
Coordinates: 45.7932, -110.9340
Caught: 0 ; Buried: 0

Caller reported: Three skier triggered avalanches reported breaking in new snow (6-8") and running 300-500' vertical. 1 between the peaks, 1 on the south peak, and 1 on the more popular run down ENE ridge. Slabs of new snow.


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Bridger Range
Fairy Lake
Skier triggered avalanche and partial burial near Fairy Lake
Incident details include images
Incident details contain video
Fairy Lake
SS-ASr-R3-D1.5-O
Aspect: NE
Caught: 1 ; Buried: 1

"The slide occurred near Fairy Lake in the Bridgers. Specifically, it occurred on a NE face just below the first set of switchbacks on the summer trail, where the slope steepens significantly. I was out early touring solo hoping to catch sunrise from the bowl. I'd just started traversing north along the base of the face when I saw a small slab release behind me which sent some sluff across my tracks, I turned to descend to some lower angle terrain, and saw another small release (20-30ft wide) in front of me. As I started to descend the whole face let go from about 150ft above me and funneled towards me. It carried me about 100ft downslope, luckily through an open patch in the trees. I was buried up to my chest, with both my arms free. From what I could see from the bottom, the crown looked to be about 4-8 inches tall, and was about 200ft across."


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Bridger Range
Saddle Peak
Small natural above Saddle Peak cliffs
Incident details include images
Saddle Peak
SS-N-R1-D1.5-I
Elevation: 7,800
Aspect: NE
Coordinates: 45.7957, -110.9330
Caught: 0 ; Buried: 0
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Out of Advisory Area
Other place
Natural Avalanche near Reynolds Pass
Incident details include images
Other place
N-R1-D1.5
Caught: 0 ; Buried: 0

From facebook: "natural avalanche down near reynolds pass. West facing slope, it faces hwy 87 and is named mile Creek trail by usfs. No snowmobiling and haven't ever seen anyone ski it."

While this is just outside of our advisory area, it is close to the Lionhead area.


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Southern Madison
Taylor Fork
Skier Triggered avalanche near Taylor Fork
Incident details include images
Taylor Fork
HS-ASu-R3-D2.5-O
Elevation: 10,000
Aspect: NE
Caught: 0 ; Buried: 0

From an email:

"We remote triggered this deep slab on our ascent. 10000 feet on ne aspect, slope around 40 degrees. Recently loaded and failed on advanced facets above an October ice crust. In places pulled the crust to the ground. As-hs-r3-d2.5 plus. Crown 2-3 feet flanks 400 ft. Spooky settlement."


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Southern Madison
Bacon Rind
Collapse and recent avalanche at Bacon Rind
Incident details include images
Bacon Rind
SS-N-R2-D1.5-O
Elevation: 8,750
Aspect: N
Coordinates: 44.9605, -111.1160
Caught: 0 ; Buried: 0

From e-mail "...Surprisingly supportive trailbreaking. Isolated collapsing both low in Bacon Rind creek, and ascending under Ernie Miller. One notable whumph at 9200' near saddle, we could hear sympathetic whumphing into the distance. Triggered from a thin spot near a tree.

Numerous older slides on the lesser angled, SE and SSE asp of Ernie Miller, as well as Northerly asps of  White Peak and BTL areas at the head of Bacon Rind creek.

One small slide on a N asp at head of Bacon rind creek, elev 8750,  had a crisper look than most of the others observed, suspect more recent. Not a big pocket but indicative of what might still be out there waiting for a trigger, given the fact that we are still observing collapses even this long after significant loading. Photo attached.

...probing at 8300' in a sheltered open low angle meadow, E asp,  found a mighty 80cm. Same setup described elsewhere in the area, about 10cm DF  which is faceting out,  capped by SH 3-5mm, overlying 25cm or so 1F slab, overlying very weak FC."


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Northern Gallatin
Hyalite - main fork
Wet loose and cornice falls Hyalite
Incident details include images
Hyalite - main fork
WL-N-R1-D1
Coordinates: 45.4076, -110.9730
Caught: 0 ; Buried: 0

From e-mail "Inverted per temps and solar aspects were cooked with wet loose activity particularly on rockier features...  More recent activity noted due to cornice fall with the increasing temperatures."


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Southern Madison
Skyline Ridge
Snowmobiler triggered on Skyline Ridge
Incident details include images
Skyline Ridge
HS-AMu-R2-D2.5
Elevation: 10,000
Aspect: SE
Coordinates: 44.9162, -111.2200
Caught: 0 ; Buried: 0

From an email:

" There was a avalanche on Sunday in Cabin Creek, it appears that a few rider's were high marking an open face, didn't see it happen but I did observe rider's from a distance in that area."


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Bridger Range
Truman Gulch
Collapsing West Side Bridgers
Incident details include images
Truman Gulch
Coordinates: 45.8221, -110.9370
Caught: 0 ; Buried: 0

From e-mail: "[In Truman Gulch]... We found a soft 4 finger layer about a foot thick over 6 to 12 inches of large grained facets that wouldn’t let us isolate a column. As we skinned up, we experienced whoomphing and cracking in the snow sometimes when the second skier crossed the pockets other times the first guy was heavy enough by himself. Nothing propagated into larger slabs..."


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Northern Madison
Collapse near Big Sky
Incident details contain video
AS
Caught: 0 ; Buried: 0
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Centennial Range
Centennials - Montana
Avalanche activity in the Centennials
Centennials - Montana
SS-N-D2.5-O
Coordinates: 44.5672, -111.5440
Caught: 0 ; Buried: 0; Killed: 0

" Yesterday, I skied into Hellroaring Canyon with a group of 6 backcountry skiers staying the night at Hellroaring Hut. While guiding the skiers to the hut, we saw large deposits of avalanche debris in the bottom of major slide paths on west and southwest facing aspects of Mt. Nemesis. It appeared that some of these avalanches were roughly size 1 - 2.5. Numerous creek bottoms and cut banks had also avalanched into Hellroaring Creek. Even some very low angle NW facing gully features had been ripped out. Looking across the valley into the Blair Lake area, I noted only one very small slide on a steep, rocky aspect. I did not have a chance to dig a snow pit, but I did observe numerous huge “whoompfs” while ski touring, and it was obvious that the faceted layer underneath last week’s 6 inches of new snow was failing regularly. "


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Cooke City
Mt. Abundance
Snowmobiler triggered Mt. Abundance
Incident details include images
Mt. Abundance
HS-AMu-R2-D2-O
Elevation: 9,500
Aspect: S
Coordinates: 45.0632, -110.0110
Caught: 0 ; Buried: 0
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Northern Madison
McAtee Basin
Snowmobiler triggered avalanche in McAtee
Incident details include images
Incident details contain video
McAtee Basin
HS-AMu-R3-D1.5-O
Elevation: 9,280
Aspect: SE
Coordinates: 45.1838, -111.4420
Caught: 0 ; Buried: 0
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Out of Advisory Area
Snowmobile triggered avalanche in Little Belts
Incident details include images
HS-AMu-R3-D2.5-O
Elevation: 8,000
Aspect: E
Coordinates: 46.9058, -110.5850
Caught: 0 ; Buried: 0

Avalanche triggered by snowmobilers in the Little Belts on Thursday (1/10). This is outside of our advisory area, but shows many of the mountains in Montana have a weak and unstable snowpack. Photo: N. Boyer


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Southern Madison
Bacon Rind
Cracking and collapsing, Bacon Rind
Bacon Rind
Elevation: 8,000
Coordinates: 44.9616, -111.0960
Caught: 0 ; Buried: 0

"I’ve been in Tele Meadows and Bacon Rind the past few days. In both places I found supportable boot top powder skiing, as soon as you stepped out of your skis however you would punch down to the ground everytime. Today there was a thin sun crust on SE facing slopes but it skied pretty well. The shaded slopes were covered in 4mm surface hoar. We observed roller balls from the day before on steep west facing slopes. We got one whoomph in the sage flats at the bottom of Bacon Rind and two good ones in the upper meadows, above 8000’."


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Southern Madison
Taylor Fork
Recent avalanche activity, Taylor Fork
Incident details include images
Taylor Fork
U-N
Caught: 0 ; Buried: 0

"These pics of recent slides were taken in Taylor’s Fork on Wednesday 1/9/19.  First one is the hill that always seems to slide in sunlight basin.  I did not venture down into the basin, so unsure of the trigger.  The second one is on the ridge by the burn."
 


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Southern Madison
Taylor Fork
Cracking and collapsing in Taylor Fork
Incident details include images
Taylor Fork
Elevation: 8,800
Caught: 0 ; Buried: 0

From an email: "Lower elevation snowpack was a wallow through deep and unsupportable facets. We were sinking 12" - 18" on skis... straight to the ground off skis. Off the road, our sled tracks were dropping down almost to the ground.

At 8200'+ the snow was a bit more supportable. No collapsing, cracking, woomphing until...

We got to 8800' and were running out of time so decided to ski out. I was going to dig a pit on a 15 degree adjacent to a steeper pitch and as soon as I stepped out on to a more cohesive slab from the shallow snowpack I was on, the whole slope collapsed and shifted downhill a few inches (See photo). Didn't dig the pit... turned around, traversed to the trees, and slid home. Based pole and hand pit, the slab seemed to be about 1F - 4F over 18" - 24" Fist hardness facets.

The difference between the slope that collapsed and the rest of the tour was the slab. There had been recent windloading and the slab was more cohesive."


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Northern Gallatin
Portal Creek
Cracking/collapsing and human triggered slide, Portal Creek
Incident details include images
Portal Creek
SS-AM-R1-D1-O
Coordinates: 45.2599, -111.1380
Caught: 0 ; Buried: 0

Riders up Portal Creek in the northern Gallatin Range experienced cracking and collapsing and possibly triggered a small avalanche. They were riding at night. Photo: N. Donovan


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Lionhead Range
Lionhead Ridge
Avalanche on Lionhead Ridge
Incident details include images
Lionhead Ridge
SS-AMu-R3-D2.5-O
Elevation: 9,000
Aspect: E
Caught: 0 ; Buried: 0

From a FB message:

"... on the way out if town in the truck we saw that Lionhead had a big slide before airplane hill. Must have been this morning because we didn't notice it yesterday."


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Lionhead Range
LIONHEAD AREA
Snowmobiler triggered slide in Lionhead
Incident details include images
LIONHEAD AREA
SS-AMr-R2-D2
Elevation: 9,000
Aspect: SE
Coordinates: 44.7333, -111.3250
Caught: 0 ; Buried: 0

A snowmobiler triggered this small, but deep avalanche as he rode under the slope.

From his email, "We were riding as a group of 5. All with beacons ,shovels, probes and 4 with inflate packs. The hill broke as I was side hilling. I was just ahead of it and not knocked off the sled."


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Lionhead Range
Lionhead Ridge
Avalanches on Lionhead Ridge
Incident details include images
Lionhead Ridge
SS-N-R3-D2-O
Elevation: 9,000
Caught: 0 ; Buried: 0

Many avalanches broke during the last week's avalanche cycle at Lionhead. Natural and snowmobile triggered slides were reported between 1/7 and 1/9. On 1/6-1/7 the area got a foot of heavy snow followed by strong winds. This loaded an unstable snowpack that is poorly supported by 1.5' of sugary snow on the ground. Avalanches broke 2-3 feet deep on this weak snow, and propagated relatively wide.


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Centennial Range
Hellroaring Creek
Remotely triggered slides in Hellroaring Creek
Incident details include images
Hellroaring Creek
SS-AMr-R3-D2
Coordinates: 44.5494, -111.5080
Caught: 0 ; Buried: 0

A sledder remote triggered several slides from the bottom of a south facing slope in the Centennial Range, Hell Roaring Creek.


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Southern Gallatin
Specimen Creek
Multiple Collapses in Specimen Creek
Specimen Creek
Caught: 0 ; Buried: 0
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Lionhead Range
Lionhead Ridge
Natural and remotely triggered avalanches near Lionhead
Incident details include images
Lionhead Ridge
SS-AMr-R3-D2
Aspect: E
Caught: 0 ; Buried: 0

Snowmobilers near lionhead witnessed three avalanches on Jan 7, 2019. One natural and two remotely triggered.

From email: "We had been climbing a safe slope adjacent to this slide... 24 inch crown and about 200 feet wide... Occurred at 1:38PM on an easterly wind loaded slope...The third slide... was triggered when the group passed below a short steep slope. We were well spaced and using safe practices when the number 6 sled in line remote triggered the avalanche. It flowed across our tracks and was about 12 inches deep. No one was caught or threatened.... on a southeast aspect."


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Northern Madison
Beehive Basin
Skier Triggered Avalanche in Beehive
Beehive Basin
SS-ASc-D1
Coordinates: 45.3397, -111.3950
Caught: 0 ; Buried: 0

From email: "We did set off one small slide on a steep slope skiing back into Beehive from the Middle Ridge. It was approximately 1 foot deep, 20 feet across and ran ~50 feet. It was very predictable and my partner got it to run after stomping on the slope."


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Cooke City
Mt Republic
Wind slab on Republic
Mt Republic
HS
Elevation: 9,700
Aspect: NW
Coordinates: 45.0006, -109.9550
Caught: 0 ; Buried: 0; Killed: 0

Skiers on Republic Mountain "noted one recent, natural wind slab avalanche on a NW aspect around 9,700', from a localized east wind". They also observed collapsing on wind-loaded slopes near the ridge. 


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Northern Gallatin
Mt Ellis
Multiple Collapses on Mt. Ellis
Mt Ellis
Caught: 0 ; Buried: 0

From email "We found really unstable snow, slopes settling on the faceted ground layer and shooting cracks propagating across the smallish open snowfields between tree clumps. It was really scary. We turned around about 100' below the ridge and cautiously skied out the way we'd skinned up.... 300' below the ridge... On one open slightly steeper section my two partners heard whoomping (after I crossed the slope)."


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Bridger Range
Ross Peak
Ross Peak Avalanche
Incident details include images
Ross Peak
HS-N-R2-D2
Aspect: NE
Coordinates: 45.8580, -110.9540
Caught: 0 ; Buried: 0; Killed: 0

 This avalanche was on a northeast slope on Ross Peak. The observation reported "very firm thick wind slabs with ground level facets" nearby. Photo: J. Johnson


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Bridger Range
Ross Peak
Avalanche near Ross Peak/Throne
Incident details include images
Incident details contain video
Ross Peak
HS-AMu-R2-D2-O
Elevation: 8,000
Aspect: E
Coordinates: 45.8670, -110.9540
Caught: 0 ; Buried: 0

A rider reported: "I had just rode up and was on my way down when it broke off right beside me. I was approximately 80 yards to the north of the slide when it broke."


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Northern Madison
Middle Basin
Skier Triggered Avalanche in Middle Basin
Incident details include images
Incident details contain video
Middle Basin
SS-ASu-R3-D2-O
Elevation: 9,400
Aspect: E
Coordinates: 45.3332, -111.3830
Caught: 0 ; Buried: 0

We found this fresh skier triggered avalanche in Middle Basin today 1/5/19. East aspect. 9,400’ elev. It broke 1-2’ deep on weak, sugary facets. We had stable results in our stability tests (so did another group nearby), but this slide and recent reports of collapsing in the area indicate an untrustworthy and unstable, poor snowpack structure. 

This avalanche was triggered by the second skier down the slope. Nobody was caught.


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Northern Gallatin
Road Cut Collapse in Hyalite
Incident details include images
SS-AWu
Coordinates: 45.4725, -110.9500
Caught: 0 ; Buried: 0

"Witnessed this road cut collapse in hyalite today , by the Palisades parking lot. Easily a foot of dense snow on 12-18" of sugar. Audible collapse as my dog climbed the embankment." C. Bieniek


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Centennial Range
Reas Peak
Snowmobile triggered avalanche near Reas Peak
Incident details include images
Reas Peak
SS-AMu-R2-D1.5-O
Elevation: 8,000
Aspect: S
Coordinates: 44.5298, -111.4930
Caught: 0 ; Buried: 0

From e-mail: "This was a snowmobile triggered slide in a S aspect in the Blue Creek Drainage SE of Reas Peak in the Centennials.  No one was caught and no injuries"


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Bridger Range
Fairy Lake
Large Collapse near Fairy Lake
Fairy Lake
SS-ASu-O
Caught: 0 ; Buried: 0

From e-mail: "We went up to Fairy Lake yesterday... to the north facing trees right off of the lake.  The wind has really done a number on the whole area, I haven't seen it like this before.  Anyway we started up and the snow was really weird.  We'd be on top of a hard wind slab and then ten feet later punch through it and be wallowing in sugar up to our knees.... the weirdness continued as we tried working east and west across the face looking for more stable snow.  After we'd climbed about 350 feet above the lake I had a big whoomp and the snow I was on collapsed about a foot, and cracks shot out about 50 feet from me. This was at about 8:30 yesterday morning."

Seperate group, same area: "ECTP 3 on a northwest exposure. Snow depth was about 60 cm where this test was taken. Dug another pit on same aspect with a 120cm base, which fractured at 27 hits, but did not propegate."


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Northern Madison
Beehive Basin
Collapse and "Whumph" in Beehive
Incident details include images
Beehive Basin
SS-AS
Elevation: 9,800
Aspect: W
Coordinates: 45.3352, -111.3840
Caught: 0 ; Buried: 0

From e-mail: " in bhive today, as I rolled into a W facing gully  at around 9800ft I got a good whumph, I noticed a 25ft wide crack probably about 8 inches deep, it did not run just fractured.  I checked it out seemed like it broke on an older slab sitting on that facet layer from early December."


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Southern Madison
Tepee Basin
Snowmobile triggered in Tepee Basin
Incident details include images
Incident details contain video
Tepee Basin
SS-AMu-R2-D1.5-O
Coordinates: 44.8887, -111.1580
Caught: 0 ; Buried: 0
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Bridger Range
Bridger Peak
Wind Slabs in the Bridgers
Incident details include images
Bridger Peak
HS-N-R3-D3-O
Aspect: E
Coordinates: 45.7690, -110.9410
Caught: 0 ; Buried: 0; Killed: 0

Multiple avalanches released on wind-loaded slopes in the Bridger Range south of Bridger Bowl. The largest propagated a few hundred feet wide on Bridger Peak. Smaller slabs released in the Pinnacles and in Argentina bowl.


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Northern Gallatin
Mt Blackmore
Collapsing, Mt Blackmore
Mt Blackmore
Coordinates: 45.4377, -110.9950
Caught: 0 ; Buried: 0
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Bridger Range
Bridger Bowl
Small wind slab at Bridger
Incident details include images
Bridger Bowl
SS-AE-R2-D1-I
Elevation: 81,000
Aspect: SE
Coordinates: 45.8092, -110.9280
Caught: 0 ; Buried: 0
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Northern Madison
Bear Basin
Cracking and collapsing, Bear Basin
Bear Basin
Coordinates: 45.3161, -111.3720
Caught: 0 ; Buried: 0

Extreme whoomphing while breaking trail along Bear Basin yesterday. Extremely faceted snow forming and producing unstable snowpack about a foot+ deep. Andrew Belli


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Northern Madison
Wilson Peak
Collapsing on Wilson Peak
Incident details include images
Wilson Peak
Elevation: 9,400
Aspect: SW
Coordinates: 45.3270, -111.3250
Caught: 0 ; Buried: 0

Skiers on Wilson Peak observed "widespread whoomfing and could visibly see the slopes drop/collapse on the climb through the trees". They dug a pit and found facets buried 40 cm deep and unstable test results at ECTP23.


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Northern Gallatin
Lick Creek
Collapsing in Lick Creek
Lick Creek
Coordinates: 45.5241, -110.9560
Caught: 0 ; Buried: 0; Killed: 0

Skiers in Lick Creek found buried facets and experienced collapsing today. From the email: "Found the same snowpack as Eric observed on Mt. Ellis yesterday. The meadow this morning was south facing. Almost all open areas had the recent new snow sitting on top of facets to the ground. Supportable enough to ski. Heard a couple whumpfs skinning up on steeper sections. No wind impact."


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Northern Gallatin
Wheeler Mountain
Collapsing on Wheeler Mountain
Wheeler Mountain
Coordinates: 45.5109, -111.0760
Caught: 0 ; Buried: 0

Skiers reported collapsing on their approach to Wheeler Mountain. From the email: " Within the the first 50 vertical feet ascending, we experienced two significant collapses/ ‘whumphing’. No signs of avalanche from the previous party’s fun looking tracks."


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Northern Gallatin
Alex Lowe Peak
Older crowns in Hyalite near A Lowe Peak
Incident details include images
Alex Lowe Peak
SS-N-R2-D2
Elevation: 9,300
Coordinates: 45.4339, -110.9950
Caught: 0 ; Buried: 0

From email on 1/3/19: "On [January] 2nd, there were 4 older natural avalanches on N slopes in the Alowe basin as well as 1 recent avalanche below the NW couloir. I've attached a pic of an older slide on the SW aspect of elephant. I also got some collapsing as I skinned up the south side of the bmor/elephant saddle on the 3rd."


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Lionhead Range
Lionhead Ridge
Natural avalanches in Lionhead
Incident details include images
Incident details contain video
Lionhead Ridge
SS-N-R2-D2-O
Aspect: E
Coordinates: 44.7243, -111.3210
Caught: 0 ; Buried: 0

This avalanche in Airplane Bowl off Lionhead Ridge, is south facing at 9,000'. The avalanche was 1-2' deep, 100' vertical and 150' wide (estimated). It likely broke late Sunday or Monday (12/31), during or immediately after the Avalanche Warning. Weak, faceted snow could not support the weekends snowstorm and there were widespread slides. Many of the crowns and debris piles were covered over with wind drifted snow, but there were many slides off the ridge on the facets.


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Northern Madison
NORTHERN MADISON RANGE
Cracking and Collapsing in Dudley Creek and Beehive
NORTHERN MADISON RANGE
Coordinates: 45.2859, -111.2840
Caught: 0 ; Buried: 0

"Wide spread whomping and cracking especially near ridge tops" noted in Dudley Creek on 1/1/2018.

"Ridge lines and wind loaded areas were very touchy and produced small slabs but they seemed isolated to certain slopes." noted in Beehive on 12/31/2018


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Northern Gallatin
Mt Ellis
Widespread Collapsing at Mt. Ellis
Mt Ellis
Coordinates: 45.5775, -110.9560
Caught: 0 ; Buried: 0

Skiers on Mt. Ellis noticed unstable conditions on New Years Day, experiencing multiple collapses. Test pits yielded unstable results, and they found "the base of the old/faceted snow was comparatively better consolidated but got progressively weaker near the top and would barely stay in the pit wall just under the ~14” of newer snow."


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Northern Gallatin
Mt Ellis
Collapsing and cracking on Mt. Ellis
Incident details contain video
Mt Ellis
Coordinates: 45.5925, -110.9590
Caught: 0 ; Buried: 0

Eric got a lot of collapsing and cracking as he climbed up through the trees towards the ridge between Little Ellis and Main Ellis. New snow on a shallow and weak snowpack are creating instability.


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Cooke City
Crown Butte
Multiple Slab Avalanches on Crown Butte
Incident details include images
Crown Butte
HS-N-R2-D2-O
Coordinates: 45.0553, -109.9600
Caught: 0 ; Buried: 0; Killed: 0

Multiple slab avalanches released on Crown Butte in Cooke City on slopes loaded by new snow and wind over the past few days. Photo: T. McCoy


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Northern Gallatin
Hyalite - main fork
Slab avalanche near Hyalite Lake
Incident details include images
Hyalite - main fork
N
Aspect: E
Coordinates: 45.3911, -110.9530
Caught: 0 ; Buried: 0; Killed: 0

Skiers saw an avalanche that released shortly after the New Year's storm cycle. From the email: "Snow was good below tree line and was nuked by the wind above tree line. Lots of variability. At Hyalite Lake we looked to our right at a slope (east facing?) and there was an avalanche that probably released 2 to 4 days ago.  See attached photo. Probably 1 to 1.5 ft crown. Didn’t run far. We kept our slope angles less than 30 degrees and dug up above the lake. ECTN 22 about 40 cm down. Wind slab and new snow on small facets." Photo: K. Birkeland


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Northern Madison
Yellowstone Club
Natural avalanches in and around YC
Incident details include images
Yellowstone Club
SS-N
Coordinates: 45.2499, -111.3740
Caught: 0 ; Buried: 0

From the Yellowstone Club Ski Patrol, " ...we noted 2 natural avalanches along one of our roads. They both are at about 7000ft and had a relatively shallow snowpack. The crowns were roughly 2ft in depth and ran on facets near the ground. One slide looks like it released during the yesterday’s storm and the other appears to have gone either overnight or this morning. Patrollers also spotted a natural avalanche outside of the ski area boundary in the Eglise Bowl. The photo was taken from a distance but the aspect is NE and the elevation is around 8500ft." Photo: YCSP


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Cooke City
Mt Republic
Natural avalanche and human triggered avalanches; Cooke
Incident details include images
Mt Republic
SS-N-R1-D2-I
Aspect: E
Coordinates: 45.0051, -109.9570
Caught: 0 ; Buried: 0

A natural avalanche was seen on the Fin of Mt. Republic on 12/31(Mon). Skiers also remotely triggered 2-4 inch deep avalanches in the new snow from 100+ feet away in Yellowstone National Park on 12/30 (Sun).

Also, " One skier triggered slide on a west aspect of Woody also observed, from yesterday (12/30) (6-12" deep and 50' wide)."


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Northern Gallatin
Mt Ellis
Collapsing and cracking on Mt. Ellis (2 parties)
Incident details include images
Mt Ellis
Coordinates: 45.5778, -110.9530
Caught: 0 ; Buried: 0

Party 1: Splitboarders on a dawn patrol got cracking and collapsing as they ascended Mt. Ellis. This occurred as they popped out of the trees at 7,600' so they stuck to lower elevation slopes. The snow stability worsened from their trip the day before. New snow and wind-loading made conditions ripe for cracks and whumphs.

Party 2: from an email, "...skinned up Little Ellis from the north today. We went up into some of those clear cuts that are visible on that side. Not surprisingly, the snow was pretty thin, with an HS of around 60 to 70 cm. The bottom 20 cm or so was total junk facets. We were getting large collapses breaking trail that were shaking bushes 30 or 40 feet away. Every time we got into some fresh snow we would get a good collapse. We were in low angle terrain (about 25 deg at the steepest), but if it had been steeper I would have been obviously pretty worried."


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Northern Madison
Beehive Basin
Beehive Basin natural avalanches
Incident details include images
Beehive Basin
SS-N
Coordinates: 45.3475, -111.4000
Caught: 0 ; Buried: 0

From an email:

"...observed lots of natural avalanches in Beehive Basin today. My partner counted 12+ including this one... All avalanche activity was on E or NE slopes which had been hammered by the winds. We found soft, more stable (ECTX) snow on SE aspects, although still found the bottom 2’ of snowpack to be rotted into <1mm facets, resting below the fresh 2’ slabs. Not reactive in our tests but there was lots of collapsing and this layer will become an issue with a heavier, more cohesive load."


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Northern Gallatin
Hyalite - main fork
Storm and Wind Slab Avalanches in Hyalite
Incident details include images
Hyalite - main fork
SS-N-R2-D1.5-I
Coordinates: 45.3923, -110.9700
Caught: 0 ; Buried: 0; Killed: 0

Skiers in Hyalite saw recent slab avalanches that failed below the most recent snow. They observed recent activity on "East, South and Northerly aspects in the Divide and Hyalite basins". Photo: C. Kussmaul


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Cooke City
Scotch Bonnet
Natural avalanches near Cooke City
Scotch Bonnet
SS-N
Caught: 0 ; Buried: 0

From an email:

"Today we skied on the southeast end of Scotch Bonnet. We saw some naturals further west (the Rasta chutes) and on some of the other big features of the region (on sheep west face and the peak just south of lulu pass). All on scotch bonnet appeared to be involving storm snow though the further ones could have involved deeper layers."


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Northern Madison
Buck Ridge
Snowmobiler triggered avalanche in 3rd Yellowmule
Incident details include images
Buck Ridge
SS-AMu-R1-D1.5
Aspect: E
Caught: 0 ; Buried: 0

A snowmobiler triggered this slide in the 3rd Yellowmule of Buck Ridge on Monday (12/31). It was an east facing slope.


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