Cooke City

Avalanches South of Cooke City

Date
Activity
Skiing

Saw a couple avalanches today in the Woody Creek Cabin area 

First was in Woody Creek, right by the waterfall. D2, crown was up to 5 feet deep. NE facing 

The other was on the backside of High Hayden, in Pilot Creek. This one ran probably 1000 feet. SE facing 

Region
Cooke City
Observer Name
Jake Mundt

Big avalanche on Sheep Mtn., Cooke

Sheep Mountain
Cooke City
Code
HS-AMu-R4-D3-O
Elevation
10000
Aspect
NE
Latitude
45.07220
Longitude
-109.92800
Notes

On 3/9/24 there was a big avalanche on the northeast side of Sheep that was previously not reported. It was there this morning so maybe happened yesterday. 6-8'+ deep, 500' wide R4-D3-O. Maybe/probably rider triggered from below.

Snowmobilers reported witnessing another rider trigger this avalanche and get partially buried.

Number of slides
1
Number caught
0
Number buried
1
Avalanche Type
Hard slab avalanche
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
4
D size
3
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
72.0 inches
Vertical Fall
300ft
Slab Width
500.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

On 3/9/24 there was a big avalanche on the northeast side of Sheep that was previously not reported. It was there this morning so maybe happened yesterday. 6-8'+ deep, 500' wide R4-D3-O. Photo: GNFAC

Cooke City, 2024-03-09

Another big avalanche, on Sheep Mtn.

Date
Activity
Snowmobiling

We rode to Round Lake and around the north and west side of Sheep, and back out through Round Lake. There was a big avalanche on the northeast side of Sheep that was previously not reported. It was there this morning so maybe happened yesterday. 6-8'+ deep, 500' wide R4-D3-O.

This morning we saw previous avalanches on Henderson Mtn. in better light and got a photo of one on the lower Henderson Bench. Showing wide propagation through thick trees.

Temps were warm under clear skies with calm wind. Snow surface was getting moist in the afternoon on sunny slopes.

Region
Cooke City
Location (from list)
Sheep Mountain
Observer Name
Alex Marienthal

Natural Avalanches on Henderson Bench

Henderson Bench
Cooke City
Code
N
Aspect
E
Latitude
45.05580
Longitude
-109.94700
Notes

On 03/08/2024 we saw widespread avalanches along Henderson Bench as well, below the steep break over in the trees, 3'+ deep breaking across multiple terrain features through thick trees, most of the bench slid, and appeared to have happened last weekend.

Number caught
0
Number buried
0
Trigger
Natural trigger
Problem Type
Persistent Weak Layer
Slab Thickness
36.0 inches
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Natural Avalanche on Barronette

COOKE CITY
Cooke City
Code
N
Latitude
45.02020
Longitude
-109.93800
Notes

From 03/08/2024: On my drive to Cooke City I saw old slab avalanches in YNP near Mammoth and on Abiathar and Ampitheater among other places. These appeared to have happened earlier in the week. I also saw a more fresh looking persistent slab avalanche on Barronette, 2-3' deep and as wide as its terrain feature, 100-200' (photo).

Number of slides
1
Number caught
0
Number buried
0
Trigger
Natural trigger
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year