21-22

Cabin Creek avalanche

Date
Activity
Snowshoeing

Avalanche on the south side of Cabin Creek filled the creek and up the opposite bank

Region
Southern Gallatin
Location (from list)
Cabin Creek
Observer Name
Trent Sizemore

This is the slope that avalanched and killed a snow bike rider (motorized) on 2/19/22. Photo is from the Search and Rescue team who were leaving the site as it was getting dark, and did not have time to gather more info. Click link below for more details. Photo: B. Zavora

Cooke City, 2022-02-19

Avalanche Fatality on Miller Mountain (snow bike)

Sheep Creek
Cooke City
Code
SS-AMu-R3-D3-O
Elevation
9800
Aspect
S
Latitude
45.03900
Longitude
-109.98100
Notes

On February 19, 2022, three snowmobilers and two snow bikers were in Sheep Creek on the south face of Miller Mountain north of Cooke City. The two snow bikers were high on the slope when one stopped on a small ridge while the other climbed higher and triggered a large avalanche. The avalanche carried him down through a gully and over a cliff where he was partially buried near the toe of the debris. His arm and airbag were visible and his head was 1 foot under the surface. Resuscitation efforts were unsuccessful. The avalanche was 800 feet wide, averaged 2 feet deep (estimated) and ran 1200 vertical feet. The avalanche likely broke on facets and depth hoar at the bottom of the snowpack in an area that was thinly covered and recently wind-loaded. The debris was up to 15 feet deep. The avalanche is classified SS-AMu-R3-D3-O.

CLICK HERE FOR THE FULL REPORT

Number of slides
1
Number caught
1
Number buried
1
Number killed
1
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
3
D size
3
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
24.0 inches
Vertical Fall
1200ft
Slab Width
800.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Skier triggered wind slab on Town Hill

Town Hill
Cooke City
Code
SS-ASc-R2-D1.5-I
Elevation
8500
Aspect
SE
Latitude
45.02560
Longitude
-109.93700
Notes

From IG message: "I initiated a ski cut below a cornice and roller, and was able to trigger a wind slab that broke roughly 15 inches deep and 30-50 feet across and slid a few hundred feet down slope. Same problem from last night, but more volume and energy today."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
c-A controlled or intentional release by the indicated trigger
R size
2
D size
1.5
Bed Surface
I - Interface between new and old snow
Problem Type
Wind-Drifted Snow
Slab Thickness
15.0 inches
Vertical Fall
200ft
Slab Width
40.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Bacon Rind

Date
Activity
Skiing

GNFAC,

I was up at Bacon Rind today, nothing to notable to note but the skiing was noticeably upside down. The snow below the 3-4 inches of new snow is faceted with enough depth to notice while skiing, which does not seem typical of a NSF/Surface Hoar layer to me. Also the snow down low, where it’s thinner, is overall less supportable and more faceted than at the start of the season, you hate to see it go that way!

Bring on the snow!

Spencer

Location (from list)
Bacon Rind
Observer Name
Spencer Jonas