23-24

Natural avalanche on Fisher mtn

Fisher Mtn.
Cooke City
Code
SS-NC-R2-D2
Elevation
10000
Aspect
E
Latitude
45.06610
Longitude
-109.95900
Notes

From email 5/11/24: “Hey Guys, here are a few photos from the weekend. The sheep Mountain Avalanche was Snowmobile triggered on Friday and the fisher peak avalanche happened today. Maybe cornice drop?”

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Cornice fall
R size
2
D size
2
Problem Type
Wind-Drifted Snow
Slab Thickness
20.0 inches
Vertical Fall
350ft
Slab Width
300.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Snowmobile triggered slide on Sheep

Sheep Mountain
Cooke City
Code
SS-AM-R3-D2
Elevation
9500
Aspect
NE
Latitude
45.07220
Longitude
-109.92800
Notes

From email 5/11/24: “Hey Guys, here are a few photos from the weekend. The sheep Mountain Avalanche was Snowmobile triggered on Friday and the fisher peak avalanche happened today. Maybe cornice drop?”

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
R size
3
D size
2
Problem Type
New Snow
Slab Thickness
24.0 inches
Vertical Fall
420ft
Slab Width
500.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Recent avalanches

Date

From email 5/11/24: “Hey Guys, here are a few photos from the weekend. The sheep Mountain Avalanche was Snowmobile triggered on Friday and the fisher peak avalanche happened today. Maybe cornice drop?”

Region
Cooke City
Location (from list)
Sheep Mountain
Observer Name
Ben Zavora

New snow instability

Date
Activity
Skiing

From IG message 5/10: "Made it most the way up Ross today turning around at the step up to the east shoulder. New snow is resting on a layer of graupel. New snow has not bonded to the old. CT12, Q2 at 90cm from the ground. HS=150cm'

Region
Bridger Range
Location (from list)
Ross Peak
Observer Name
Tyler Miller

Remote triggered storm slab near Cooke

Round Lake
Cooke City
Code
SS-AMr-R2-D1
Elevation
9000
Latitude
45.07450
Longitude
-109.90700
Notes

From IG story 5/8/24: "@mtavalanche remote triggers today in Cooke City. 2-4' of fresh north of round lake."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
Trigger Modifier
r-A remote avalanche released by the indicated trigger
R size
2
D size
1
Problem Type
New Snow
Slab Thickness
14.0 inches
Vertical Fall
30ft
Slab Width
42.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Remote triggered storm slabs

Date
Activity
Snowmobiling

From IG story 5/8/24: "@mtavalanche remote triggers today in Cooke City. 2-4' of fresh north of round lake."

Region
Cooke City
Location (from list)
Round Lake
Observer Name
BPG

Warming quick in the Bridgers

Date
Activity
Skiing

Up on the Ridge this morning, the recent snow had developed a 3-5 cm crust, and remained moist underneath. No active signs of instability while the snow remained cold, except for the various crowns from slides which broke during the storm (Avalanche Gulch, North Bowl, etc.), and lots of rollerballs from yesterday. Within an hour of sunrise the surface crust began to break down, and small loose releases were beginning to rain down from cliffs and around the large cornices. The cornices, some reaching the size of a small car, were already visibly sagging and many smaller cornices easily released under body weight.

Region
Bridger Range
Location (from list)
Bridger Bowl
Observer Name
Wyatt Hubbard