Avalanche Activity

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: 45.423700, -110.9960000
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: 45.069900, -109.9580000
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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Bridger Range
Wolverine Bowl
Skier Triggered Wind Slab, Bridger Range.
Incident details include images
Wolverine Bowl
SS-AS-R1-D1-S
Elevation: 8,300
Aspect: NE
Coordinates: 45.829100, -110.9340000
Caught: 0 ; Buried: 0

Strong winds in the Bridger Range formed dense slabs on leeward slopes. Yesterday, A skier north of Bridger Bowl triggered multiple wind slabs near the top of Wolverine Bowl. The skier turned around and chose a safer objective. Photo: S. Whitefields 


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Northern Madison
Big Sky Resort
Large natural in Headwaters at Big Sky
Big Sky Resort
HS-N-D3.5-O
Elevation: 10,000
Aspect: N
Coordinates: 45.284300, -111.4410000
Caught: 0 ; Buried: 0

From BSSP: "The 1st, 2nd and 3rd Fork had failed as a unit taking out all of the early November snow, failing on facets above the October crust.  It ran far, taking out some mature trees and depositing a wide swath of debris 6-10’ onto the Merriweather ski run.  It was estimated to be a Size 3.5."


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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: 45.442900, -110.9320000
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: 45.336500, -111.3810000
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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Cooke City
Daisy Pass
Small dry loose slides near Cooke
Incident details include images
Daisy Pass
L-N-R1-D1
Caught: 0 ; Buried: 0
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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: 45.439800, -110.9540000
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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Northern Madison
Beehive Basin
Small wind slabs beehive
Beehive Basin
SS-N
Elevation: 9,500
Aspect: E
Caught: 0 ; Buried: 0
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Northern Gallatin
Hyalite Peak
Natural wind slab near Hyalite peak
Incident details include images
Hyalite Peak
SS-N-R2-D2
Coordinates: 45.382700, -110.9550000
Caught: 0 ; Buried: 0
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Northern Gallatin
Mt Blackmore
Multiple crowns up Hyalite
Incident details include images
Mt Blackmore
SS-N-R1-D1
Aspect: NE
Coordinates: 45.444100, -111.0030000
Caught: 0 ; Buried: 0
From Zack Keskinen:
 
Mt Blackmore 11/07
HN24 - 20cm
S1 - 8/8 - W (Light)
 
Noted multiple small crowns (15-20cms) on NE steep rocky terrain.Pit seemed reasonably consistent with a couple hand pits across the day in the "above treeline" zone.

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Northern Madison
Big Sky Resort
Explosive triggered slide at Big Sky
Big Sky Resort
HS-ABc-R3-D2-O
Elevation: 10,901
Aspect: N
Coordinates: 45.278300, -111.4490000
Caught: 0 ; Buried: 0

"We triggered a large avalanche in the Cirque with a 5lb. shot dangled from the Tram.  The slide broke 3’ deep and took out the Dobies, Cron’s and part of the Ramp Shot avalanche paths.  Hard slab- 1F minus generally.  Storm slab from the past 8 days.  The slide ran on a crust that formed from the left over snow from mid- October that got warmed in the 3rd week of October.  The weak layer was just a thin layer of lower density snow trapped under the hard slabs- didn’t seem to be particularly faceted. Some grauple. The crust is not very hard or slick, about 2cm thick, and crumbled easily in hand... The slide had good propagation and the crown was at least 300’ long- impressive debris pile." -Big Sky Ski Patrol


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Northern Gallatin
Divide Cirque
Many small 8" soft slabs in Hyalite
Incident details include images
Divide Cirque
SS-N-R1-D1-S
Coordinates: 45.393000, -110.9570000
Caught: 0 ; Buried: 0
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Bridger Range
Bridger Bowl
Several naturals at Bridger Bowl
Bridger Bowl
SS-N-R2-D2-S
Elevation: 8,200
Coordinates: 45.819200, -110.9280000
Caught: 0 ; Buried: 0
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Bridger Range
BRIDGER RANGE
Multiple avalanches in the N. Bridger Range
Incident details include images
BRIDGER RANGE
SS-N
Coordinates: 45.934800, -110.9890000
Caught: 0 ; Buried: 0

From the MSU Backcountry Club in Instagram:Warning! This is a current, fresh, crown in the northern Bridgers! Every aspect had a visible crown and avi debris! This crown was 56cm at it deepest and over 8 meters long. ECTP21@53 and CT24@54 on the overlying slab.


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Northern Madison
Big Sky Resort
Avalanche in Big Couloir at Big Sky
Incident details include images
Big Sky Resort
SS-N-R2-D2
Elevation: 10,900
Aspect: NE
Coordinates: 45.279200, -111.4500000
Caught: 0 ; Buried: 0

Avalanche happened around 1100hrs


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