Avalanche Incidents

Out of Advisory Area
Crazy Peak
Skier partially buried in Crazies
Crazy Peak
SS-ASu-R2-D2-S
Elevation: 10,000
Aspect: N
Coordinates: 46.0213, -110.2840
Caught: 1 ; Buried: 1

From e-mail: "[A solo skier] was turning around [on the face of Crazy Peak] after noticing the wind was affecting the snow when he got hit from above and partially buried, losing some belongings. He was able to dig himself out and was uninjured... He said he thought the slide broke 200 feet wide, and ran from the middle of the face to the bowl."


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Bridger Range
Northern Bridgers
Skier triggered wet slab N. Bridgers
Incident details include images
Northern Bridgers
WS-ASu-R2-D1.5-O
Elevation: 7,500
Aspect: SE
Caught: 0 ; Buried: 0

From e-mail: "while skiing a short, SE-facing slope, we triggered a wet slab avalanche. We both skied to the side, but it was a real wakeup call to the current snowpack. Going from below freezing all winter to sudden warming has left a lot of layers. We didn't measure the slope angle, but it couldn't have been more than 32 degrees in the starting zone. The slide was slightly to skier's right of the slope, and the middle of the slope was only 6" deep, but much deeper where the slide occurred. Maybe 30-40' wide at the crown, ran 80'.


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Southern Madison
Sage Peak
Snowbike triggered wet slab, Sage Peak
Incident details include images
Sage Peak
WS-AO-R3-D2-O
Elevation: 8,700
Aspect: SW
Caught: 1 ; Buried: 1; Killed: 0

The slide was triggered by a snowbiker. The rider triggered the slide side-hilling and was buried to his chest. 


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Northern Madison
Beehive Basin
Skier triggered slide NE of Beehive Peak
Incident details include images
Beehive Basin
SS-ASu-R2-D2-I
Elevation: 9,600
Aspect: NE
Coordinates: 45.3545, -111.4000
Caught: 0 ; Buried: 0; Killed: 0

A group of skiers watched another group trigger a large wind slab avalanche near Beehive Peak. Luckily, none were caught or buried. From the email:

"On Tuesday (3/12) we observed 3 skiers trigger an avalanche on the north face of Peak 10,602 (the summit just NE of Beehive Peak). We saw the event unfold from a distant ridge, but was able to see that none of them were caught. Later in the day, we ended up at the base of the slope that avalanched and determined the issue to be the same wind slab we had been encountering on numerous N and NE slopes throughout the day. The crown depth was 6-8 inches and was about 100ft wide. The avalanche ran at least 600 vertical feet."


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Out of Advisory Area
Other place
Large remotely triggered in Absaroka
Incident details include images
Other place
HS-ASr-R3-D3-O
Elevation: 8,000
Aspect: N
Caught: 0 ; Buried: 0

From e-mail: " Partner remotely triggered large R3-3.5 D3 on a north facing slope at around 8,000 ft elevation. Avalanche ran on facets on the ground and took the entire snowpack with it. Avalanche ran about 1200-1500 vertical taking out mature timber. A very close call and glad that no one was caught. " - Anonymous


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Northern Madison
Bear Basin
Skier trigger Deep slab Bear Basin
Incident details include images
Bear Basin
HS-ASu-R3-D2.5-O
Elevation: 9,600
Aspect: NE
Coordinates: 45.3436, -111.3790
Caught: 0 ; Buried: 0

A four person party triggered this avalanche on Saturday night at around 5:30...One of the members wrote: “It broke on the persistent weak layer underneath a hard windslab directly at my feet, a yard or so from the diagonal rock band near the top of the ridge. The crown was roughly 3 feet at skier’s left and 12 feet at the rock outcrop on skier’s right. The avalanche stepped down to the ground on depth hoar around 250 ft from the crown due to the energy of the first slide. One skier was still on the skin track far below us before the track cut into the fall line. Everybody made it out. I’m sure it was triggered because of the shallower snowpack near the rock band. Snow pits were dug and that persistent layer the original avalanche went on was found but wouldn’t propagate”

From different group on Sunday e-mail: "... we saw  a debris pile that had come down from near the bat ears couloir in bear basin, it looked good size and some dirt and small trees so we decided to get a closer look. It appeared that a group skinned up North fork trail..., bootpacked up bat ears couloir, skied it with no problems, and then decided to  skin up a  real rocky  thinner face  slightly east of the couloir, the skin track appeared to make it to the top of the ridge however there was only 1 downhill ski track and that left from low on the skin track.... N-ne slope guessing 9500-10k ft. Crown was between 1and 10 ft deep, average looked about 2-3 deep, down pretty close to the ground in a lot of  spots.”

From separate e-mail: "D2.5 avalanche on an NE aspect in Bear Basin in the Northern Madisons, 9600ft, there were tracks in the run out (covered by the debris pile)... running on basal facets. Terrain was very rocky, steep, and visibly wind loaded."


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Cooke City
COOKE CITY
Avalanches in new snow in Cooke City
Incident details include images
COOKE CITY
SS
Caught: 0 ; Buried: 0

These are observations from Doug Chabot's field trip on 3/8, Friday:

  1. One slide was triggered on a steep (40 deg) southeast facing slope at Round Lake outside Cooke City. It failed 8" deep on a layer of graupel and small facets. An adjacent hill slid at the same depth beforehand. This layer is not on most slopes, but as this slide shows it is on some. Doug was in the area and dug a pit in the crown soon after it was triggered.
  2. A slide under the cornice on the northeast face of Abundance looked to be 1 foot deep and 200' wide.
  3. A snowboarder reported triggering an 8" deep slab on the south face of Scotch Bonnett in one of the Rasta's.

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Northern Gallatin
Mt Blackmore
Skier triggered avalanche on Mt. Blackmore
Incident details include images
Mt Blackmore
SS-ASu-R2-D1.5-I
Aspect: NE
Coordinates: 45.4455, -111.0040
Caught: 0 ; Buried: 0

From an email:

"I’d like to report an avalanche incident that occurred today, 3/6, around 2 PM on the NE face of Mt. Blackmore in the Hyalite Canyon area. On the approach, I dug a pit at 9400’ and found a very stable and deep snowpack, with a somewhat definite weak layer in between high and medium density snow about 8” deep. The layer did not slide or propagate in an extended column pit test, so my partner and I decided do ski the direct line from the summit. I skied first, making a ski cut just below the ridge line that did not result in any sloughing. I skied the line without mishap. My partner followed, traversing onto a shallow, steep pocket, releasing the avalanche. It propagated down and out in both directions, resulting in a v-shaped crown about 100’ across and 8-12” deep. The slide ran from around 9800’ to 9400’. My partner was not caught and was able to traverse out and ski down safely."


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Southern Madison
Sage Peak
Snowmobile triggered behind sage peak
Incident details include images
Sage Peak
SS-AMu-R3-D2-I
Caught: 0 ; Buried: 0
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Bridger Range
Truman Gulch
Skier avalanche fatality on west side of Bridgers
Incident details include images
Incident details contain video
Truman Gulch
HS-ASu-R3-D2.5-O
Elevation: 8,300
Aspect: W
Coordinates: 45.8068, -110.9350
Caught: 1 ; Buried: 1; Killed: 1

Yesterday afternoon a skier was killed in a slide on the west side of the Bridger Range at the top of Truman Gulch on a run called St. Lawrence. The skier was travelling solo and a separate party of two, skinning uphill, witnessed him triggering the slide and getting swept downhill. They responded swiftly, got a beacon signal and saw his hand sticking out of the snow. The dug him up and did CPR, but the skier never revived.  He was carried approximately 1,000 feet vertical down a steep slope causing fatal trauma. The skier was a well known and loved local and we are deeply saddened to report this tragic accident. In the coming days we will release a full accident report.


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Cooke City
Henderson Mountain
Snowmobiler partially buried on Henderson Mtn.
Henderson Mountain
AMu-D2
Coordinates: 45.0521, -109.9450
Caught: 1 ; Buried: 1

The GNFAC talked to the rider on the phone, but he did not have many details as this was his first time riding in the area and he had poor visibility. He was on his sled, mid-slope in a gully, filming a friend when he was hit from behind. He had rescue gear and an airbag pack, but the handle for the airbag was zipped closed and he could not deploy it. His upper body was buried under 3" of snow and his lower body was out. He was dug up quickly without injury. His sled was also buried with a small piece sticking out of the snow.

He thinks he was on the Fisher Creek side of Henderson Mountain.

It was snowing and blowing hard all day.


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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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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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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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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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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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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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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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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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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 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
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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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
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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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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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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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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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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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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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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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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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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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
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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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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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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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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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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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 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
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
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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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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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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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
The Throne
Cracking and avalanching from ski cuts, Bridgers
Incident details include images
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The Throne
SS-R1-D1
Coordinates: 45.8829, -110.9510
Caught: 0 ; Buried: 0

Slides were skier triggered. Wind-loaded from new snow. They triggered two in that area on the steeper rollovers. One in that main south facing chute and another on the face above sled parking.


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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 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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Cooke City
Mt. Abundance
Snowmobiler triggered on Mt Abundance
Incident details include images
Mt. Abundance
SS-AMu-R1-D2-O
Aspect: S
Coordinates: 45.0790, -110.0200
Caught: 0 ; Buried: 0

The avalanche on the south face of Mt Abundance was set off at about 2:00 pm on Thursday. A rider realized he triggered a slide on his way back down the slope. It was estimated to be at least 1+ foot deep, 100 feet wide, and ran 100 feet slope distance. It was big enough to bury a person.

This depth (est. 1+') is similar to the faceted layer that was unstable near Lulu Pass the day before (ECTP22).


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Out of Advisory Area
Emigrant Peak
Skier triggered on Emigrant Peak
Incident details include images
Emigrant Peak
HS-ASu-R3-D3-O
Elevation: 9,800
Aspect: N
Coordinates: 45.2629, -110.7070
Caught: 0 ; Buried: 0
From an email:
 
This was triggered Christmas Eve day while skinning up a ridge in the mountains east of Emigrant Peak. It broke about 8' back from the cornice/drift right near my ski tips. I instinctively did a quick drop and roll away even though it was unnecessary. Pretty pulse quickening. I didn't get great pictures as I was heading up the ridge and the light was bad. You can pick out the debris flow by its lighter shade of white and see chunks of cornice/slab that got hung up in the starting zone.
 
North Facing aspect at approx. 9800' on a west to east ridge.Slope angles are 35-40. Crown varied from 1-3'. Hard slab on the the cornice propagated to two other small starting zones and pulled the cornices and all the faceted snow near the ridgeline. Avalanche ran about 800'. 
 
The last few week's weather has really weakened what was starting off to be a decent base.  Now the winds have capped a a lot of zones with a hard slab pockets.
 

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Northern Madison
Buck Ridge
Snowmobiler triggered wind slab
Incident details include images
Buck Ridge
HS-AMu-R1-D2
Caught: 0 ; Buried: 0

A snowmobnler triggered this avalanche in the 2nd Yellowmule of Buck Ridge. No one was caught.


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Bridger Range
Bridger Peak
Bridger Peak Avalanche
Incident details include images
Incident details contain video
Bridger Peak
HS-ASc-R2-D2-O
Elevation: 8,700
Aspect: NE
Coordinates: 45.7699, -110.9390
Caught: 0 ; Buried: 0; Killed: 0

This wind slab avalanche released as a result of an intentional ski cut. The initial slab that released triggered a larger slab that ran close to 2000 feet. From the skier:

"At around 12:30 I ski cut the top of a NE facing gully on Bridger Peak, roughly 35°. A hard slab broke 6”-12” deep, around 100’ wide. This broke a secondary slab on a NNE aspect adjacent to the first one, around 300’ wide. The slide ran through trees and a gully, traveling close to 2000’ vertical into some lower angle terrain. It broke on the layer of facets that formed last week during the cold weather."


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Northern Madison
Buck Ridge
Snowmobiler triggered wind slab on Buck Ridge
Incident details include images
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Buck Ridge
HS-AMu-R2-D2-O
Elevation: 9,400
Aspect: N
Coordinates: 45.1821, -111.4130
Caught: 0 ; Buried: 0

This avalanche was around the corner from the snowpit we dug in 2nd Yellowmule. It looked as though it was triggered about the same time we were digging. The slide failed on near-surface facets that formed 10 days ago that are underneath a hard slab of wind-drifted snow.


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Northern Madison
Buck Ridge
Snowmobile triggered avalanche on Buck Ridge
Incident details include images
Buck Ridge
HS-AMu-R3-D2-O
Elevation: 9,100
Coordinates: 45.1633, -111.3100
Caught: 0 ; Buried: 0

A snowmobiler triggered this slide yesterday while sidehilling on the leeward side of a ridge. Estimated crown was about 50' wide and broke about 12-18” deep.


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Bridger Range
Truman Gulch
Cracking and "whumphing" drifts, Bridgers
Incident details include images
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Truman Gulch
AS-O
Aspect: W
Coordinates: 45.8172, -110.9310
Caught: 0 ; Buried: 0

Strong winds created 12-18" thick wind drifts that collapsed on buried facets and surface hoar. We had one crack 30' wide as we left a snowpit.


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Cooke City
Republic Creek
Skier triggered small wind slab
Republic Creek
SS-ASc-R1-D1-I
Aspect: SW
Caught: 0 ; Buried: 0

From an email:

  • Triggered small windslab in SW facing gulley at 9000' approximately 6" by 20'wide
  • No collapsing or cracking of the snowpack observed, other than the isolated wind slab.

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Northern Gallatin
Hyalite - main fork
Ice climber triggered wind slab in Hyalite
Incident details include images
Hyalite - main fork
HS-AF-R1-D1-I
Aspect: W
Coordinates: 45.4292, -110.9550
Caught: 0 ; Buried: 0
From an email:
"Hit a small, unstable pocket while hiking in Hyalite today. We were traversing under the cliff band between Dielectric Breakdown over to Alex's Solo 1. The layer broke at a boundary between older snow and recently wind-transported slab. No consequences his time, but it is a great reminder of how quickly conditions can change when you're hiking. In the wrong terrain, a slide like this could be really bad."

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Northern Gallatin
Hyalite - main fork
Ice climber triggered small wind pocket Hyalite
Incident details include images
Hyalite - main fork
SS-AFc-R1-D1-I
Aspect: NW
Coordinates: 45.4395, -110.9620
Caught: 0 ; Buried: 0

From e-mail: "The wind picked up after noon today and we observed moderate amounts of blowing snow at and above tree line. My climbing partner and I were able to trigger a small loaded pocket between slot corner and curtains, 30 deg, NNW aspect, which failed 6 inches deep and 15 ft wide on diurnal facets (old snow surface). The slab didn't move much due to the stubborn angle..."


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Southern Madison
Imp Peak
Skier triggered wind slab, Southern Madison Range
Incident details include images
Imp Peak
SS-ASu-R1-D1-I
Caught: 0 ; Buried: 0

Skiers descending Imp Peak in the southern Madison Range triggered this small wind slab. This is bull's eye information that larger slides are possible on wind loaded slopes. 


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Northern Madison
Beehive Basin
Skier triggered wind slab in Beehive
Incident details include images
Beehive Basin
SS-AS-R2-D1.5
Elevation: 10,000
Aspect: S
Coordinates: 45.3525, -111.4000
Caught: 0 ; Buried: 0

From e-mail: "We encountered very localized loading that easily fractured and propagated uphill on a south aspect (photos) then bailed on the E/NE facing run we had hoped to ski, due to a 12-18" slab at the top, obvious wind loading throughout the whole thing (9900'-10300'), and the aforementioned obvious signs of instability. When we turned around, another similar-sized (4-8" by 10-20') slide had occurred on the same aspect as the one we had triggered. Neither ran more than 100' or so."


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Northern Madison
Beehive Basin
Skier triggered loose snow in Beehive
Incident details include images
Beehive Basin
L-ASu-R1-D1-S
Elevation: 9,500
Aspect: SW
Coordinates: 45.3448, -111.3880
Caught: 0 ; Buried: 0

From e-mail: "triggered a small wet slide in the Going Home chute coming back into Beehive, and we observed another natural wet slide on a similar aspect that had occurred since we toured past in the morning. Wind was light or calm all day and wind effect was minimal even at ridgelines." 


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Northern Madison
Bear Basin
Skier triggered new snow avalanche
Incident details contain video
Bear Basin
SS-ASu-R2-D2-I
Coordinates: 45.3498, -111.3850
Caught: 0 ; Buried: 0

From e-mail: "Today while skiing Bat Ears Couloir in Bear Basin we encountered fast moving 12" deep wind loaded sluff however, it didn't step down."

Second e-mail: "Upon entering the couloir I performed a ski cut and released an 8 inch deep slab that was about 12 feet wide that ran about 700 vertical. Then we skied the slide path down and safely returned into beehive by exiting down bear basin. "


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Northern Gallatin
Mt. Bole
Skier triggered wet loose in Hyalite (Mt. Bole area)
Incident details include images
Mt. Bole
WL-ASu-I
Elevation: 9,500
Aspect: SE
Coordinates: 45.4237, -110.9960
Caught: 0 ; Buried: 0

From an email:

Today, at around 11am, my partner preformed a ski cut on the top of a gully. The area he cut was south facing and in direct sunlight. The slough from his cut gained momentum and formed a small avalanche that went down the entire gully and apron, taking all of the previous days snow with it. The avalanche went on the old snow sun-crust, and new snow interface. We ascended from the back and found very stable results in both our pits, although they were both high and north facing. No one was caught or injured.

I had already skied down part of the slope in another gully, that was entirely shaded, and produced no snow movement.


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Cooke City
Lulu Pass
Snowmobile triggered slide, Lulu Pass Cooke City
Incident details include images
Lulu Pass
SS-AMu-R1-D1-O
Elevation: 9,500
Aspect: E
Coordinates: 45.0699, -109.9580
Caught: 0 ; Buried: 0

A snowmobiler triggered this small wind slab near Lulu pass outside of Cooke City. Wind loaded slopes are main avalanche concern across the advisory area. 


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Northern Gallatin
Flanders Creek
Climber triggered wind slab in Flanders
Incident details include images
Flanders Creek
SS-AFu-R0-D1-O
Elevation: 9,000
Aspect: SE
Coordinates: 45.4429, -110.9320
Caught: 0 ; Buried: 0

Climbers triggered this very small wind slab on the way to a climb up Flanders in Hyalite (11/11). A tiny slide to a skier can be bad news for a climber since losing one's balance or getting pushed off a cliff can be deadly. From an email (edited):

Hyalite Snow Conditions:...we dug two hasty pits on east facing slopes in Flanders....
8200'- isolated opening in trees in an area on rocks, shallower snow (~50cm). CT12 at the ground, again just tapping on the back of other hand, so not super legit, but did raise eyebrows.  
8450'- Opening below cliff bands on exposed traverse. Deeper snow (~80-90cm). No concerns other than storm snow and snow coming off of cliff bands.  Classic Hyalite shifty winds.  We released a small (10-15cm) storm slab on traverse into the climb .  
Weather: It was snowing and blowing all day.

Photo: S. Magro


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Northern Madison
Middle Basin
Snowboarder triggered wind slab in Middle Basin
Incident details include images
Middle Basin
SS-ARu
Coordinates: 45.3365, -111.3810
Caught: 0 ; Buried: 0

From Instagram @chartierk:

"Careful out there this year! While we are lucky enough to have a mostly stable snowpack here in Southwest Montana, we did just find this little wind slab well below the ridge line in Middle Basin. Slowboarder was fine"


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Northern Gallatin
Hyalite - main fork
Ice climber triggered small slab in Hyalite
Incident details include images
Hyalite - main fork
SS-AFu-R1-D1-S
Aspect: W
Coordinates: 45.4398, -110.9540
Caught: 0 ; Buried: 0

Ice climber triggered. From e-mail: "Was descending off of Zach Attack tonight and set off a small slab in the gully on the decent. This was about 100 meters below the start of pitch 1. Constant whipping winds and lots of new deposited snow likely caused the slab to form. Climber caused. Didn’t carry me as it was small. Would be wary of the mummy cooler gullies abover scepter as well."


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