Avalanche Activity

Bridger Range
Hardscrabble Peak
Small skier triggered slides in Northern Bridgers
Incident details include images
Hardscrabble Peak
HS-ASu-R1-D1
Coordinates: 45.9151, -110.9810
Caught: 0 ; Buried: 0

On 11/12, two small slides were reported in the Northern Bridger Range near Fairy Lake, at least one of which was skier triggered.

The skier triggered slide was "a wind slab approximately 50 X 50’ with a 6” crown. The slab itself was only about 4” thick and only slid about 5” down the slope before stopping, and I was able to stop and then turn around and ski off of the slab without it moving any further. The 4” of dry slab was sitting on about 3” of sugary snow that was on a very firm icy bed surface."

We don't have details on the other slide, but it was reported as a wind slab avalanche on the NE side of Pomp Peak.


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Cooke City
COOKE CITY
Natural wind slab avalanches near Cooke
Incident details include images
COOKE CITY
SS-N-R2-D1.5-I
Aspect: NE
Coordinates: 45.0202, -109.9380
Caught: 0 ; Buried: 0

After the storm from Oct 13-24, a strong southwest wind event on Oct 30 drifted the recent snow into slabs that avalanched naturally. Activity was mostly on NE aspects. 


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Bridger Range
Bridger Bowl
Skier triggered wind slab at Bridger
Incident details include images
Bridger Bowl
ASu-R2-D1.5-I
Elevation: 7,800
Aspect: NE
Coordinates: 45.8156, -110.9230
Caught: 0 ; Buried: 0

Skier triggered slide on 10/26 at Bridger Bowl near the top of Pierre's Knob lift. Reported via IG story/message.


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Cooke City
COOKE CITY
Cracking wind drifts in Cooke City
COOKE CITY
Coordinates: 45.0202, -109.9380
Caught: 0 ; Buried: 0

Cracking wind drifts reported in Sheep Creek Basin on 10/24.


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Northern Gallatin
Mt Blackmore
Loose snow avalanches on Blackmore
Incident details include images
Mt Blackmore
L-N-O
Aspect: E
Coordinates: 45.4444, -111.0040
Caught: 0 ; Buried: 0

Today I skinned in and skied around the E side of the N ridges coming down off of Blackmore. The snow is about 2’ deep off of the ridge down to the bottom of the bowl on the east faces, with variations where the wind has loaded/stripped the snow. The wind was gusting out of the N/NW/W.  I observed some natural loose dry sluffs on the N face and the E face off the N ridge. They look like they came down in the last 24 hours with this new snow and wind; they were still fairly defined when I saw them.


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Bridger Range
Frazier Basin
Avalanches and cracking in Frazier Basin
Incident details include images
Frazier Basin
SS-N
Coordinates: 45.9233, -110.9800
Caught: 0 ; Buried: 0

From an observation:

...we were out in Frazier Basin today and noticed some activity. While skinning up a south face we found a couple isolated wind pockets that propagated the top 2-3”... nothing slid. We did also found some couloirs that had storm slabs that had ran in the last few days, both south and north aspects.

From another observer:

Increasing wind speeds overnight and during the morning were easily transporting snow and building thin, stiff slabs. Slab formation was most intense along ridgelines but there were some thin, mid-slope slabs present on cross-loaded terrain features. Lots of loose issues, particularly as the sun was warming things up.


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Northern Madison
Sphinx Mountain
Small avalanche on Sphinx Mountain
Incident details include images
Incident details contain video
Sphinx Mountain
SS-AFc-R2-D1-O
Elevation: 9,500
Aspect: NE
Coordinates: 45.1582, -111.4770
Caught: 0 ; Buried: 0

From Doug Chabot:

Today I turned around on the approach to an ice climb on the north face of the Sphinx. Cracking in the windblown snow was a sign of things to come. At the first wind-loaded gully I crawled on my hands and knees over to the slope and whacked it with my ice axe. It avalanched. Although it was only 4" thick, it propagated 75 feet above and scraped the snow over a cliff. We opted to not tempt any more slopes and went home.


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Northern Gallatin
Hyalite - main fork
Widespread dry loose in Hyalite
Incident details include images
Hyalite - main fork
L-N-R1-D1-S
Elevation: 9,000
Coordinates: 45.4472, -110.9620
Caught: 0 ; Buried: 0

A skier saw widespread small dry loose avalanches in Hyalite on 10/22.


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Bridger Range
Fairy Lake
Natural avalanches near Fairy Lake
Incident details include images
Fairy Lake
SS-N-R1-D1
Aspect: NE
Coordinates: 45.9043, -110.9580
Caught: 0 ; Buried: 0

Two parties skiing near Fairy Lake on October 19th observed several natural avalanches that likely broke the day before (Sunday, Oct 18th). The avalanches broke in areas of wind drifted snow.


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