21-22

Snowboarder triggered, un-injured, N. Bridgers

Northern Bridgers
Bridger Range
Code
HS-ASu-R2-D1.5-O
Elevation
7500
Latitude
45.91960
Longitude
-110.97600
Notes

From obs 3/12/22: "Upon descending a ~35 degree slope, I (the snowboarder) kicked loose a wind slab that propagated 100 feet wide, 8 inch deep (max, 4 inches at edges) wind slab that traveled approximately 300 feet (entire slope over 30 degrees) before settling in 2 debris fields, each about 30’ wide and with a maximum of 2’ depth. No one was swept by the debris/buried/injured."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Skier
Trigger Modifier
u-An unintentional release
R size
2
D size
1.5
Bed Surface
O - Old snow
Problem Type
Wind-Drifted Snow
Slab Thickness
6.0 inches
Vertical Fall
300ft
Slab Width
100.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

From obs 3/12/22: "Upon descending a ~35 degree slope, I (the snowboarder) kicked loose a wind slab that propagated 100 feet wide, 8 inch deep (max, 4 inches at edges) wind slab that traveled approximately 300 feet (entire slope over 30 degrees) before settling in 2 debris fields, each about 30’ wide and with a maximum of 2’ depth. No one was swept by the debris/buried/injured."

Bridger Range, 2022-03-13

From obs 3/12/22: "Upon descending a ~35 degree slope, I (the snowboarder) kicked loose a wind slab that propagated 100 feet wide, 8 inch deep (max, 4 inches at edges) wind slab that traveled approximately 300 feet (entire slope over 30 degrees) before settling in 2 debris fields, each about 30’ wide and with a maximum of 2’ depth. No one was swept by the debris/buried/injured."

Bridger Range, 2022-03-13

From obs 3/12/22: "Upon descending a ~35 degree slope, I (the snowboarder) kicked loose a wind slab that propagated 100 feet wide, 8 inch deep (max, 4 inches at edges) wind slab that traveled approximately 300 feet (entire slope over 30 degrees) before settling in 2 debris fields, each about 30’ wide and with a maximum of 2’ depth. No one was swept by the debris/buried/injured."

Bridger Range, 2022-03-13

Many natural 6-10" deep avalanches near Cooke

COOKE CITY
Cooke City
Code
SS-N-R3-D1.5-O
Elevation
9500
Aspect
S
Latitude
45.02020
Longitude
-109.93800
Notes

On 3/12/22. We saw 5+ avalanche crowns that appeared to have broke naturally, and got reports of a few others. All were 6-10" deep, recent wind-drifted snow failing on a hard melt-freeze crust.

Number of slides
7
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
3
D size
1.5
Bed Surface
O - Old snow
Problem Type
Wind-Drifted Snow
Slab Thickness
8.0 inches
Vertical Fall
100ft
Slab Width
150.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Snowmobile triggered, Rastas and near Sheep

Scotch Bonnet
Cooke City
Code
SS-AM-R2-D1-O
Elevation
9500
Aspect
S
Latitude
45.07330
Longitude
-109.94800
Notes

We witnessed a recently triggered slab near Sheep Mtn. on 3/12/22, and a rider reported triggering a slide on Scotch Bonnet near Lulu Pass.

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
R size
2
D size
1
Bed Surface
O - Old snow
Problem Type
Wind-Drifted Snow
Slab Thickness
8.0 inches
Vertical Fall
50ft
Slab Width
70.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Skier remote triggered near Cooke

Zimmer Creek
Cooke City
Code
SS-ASr-R3-D1-O
Elevation
9000
Aspect
S
Latitude
45.09990
Longitude
-109.88400
Notes

Skiers remote triggered a soft slab on a S facing slope. Broke about 8 inches deep on the mfc

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
r-A remote avalanche released by the indicated trigger
R size
3
D size
1
Bed Surface
O - Old snow
Problem Type
Wind-Drifted Snow
Slab Thickness
8.0 inches
Vertical Fall
100ft
Slab Width
150.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Avalanche in N. Bridgers

Date
Activity
Skiing
Snowboarding

Upon descending a ~35 degree slope, I (the snowboarder) kicked loose a wind slab that propagated 100 feet wide, 8 inch deep (max, 4 inches at edges) wind slab that traveled approximately 300 feet (entire slope over 30 degrees) before settling in 2 debris fields, each about 30’ wide and with a maximum of 2’ depth.

No one was swept by the debris/buried/injured. 

After I cleared the path, my partner descended in my track, still attempting to cut  any lower layers loose. As he was descending, he got swept my some loose slough and fell briefly, able to regain control and continue down the aspect.

Region
Bridger Range
Location (from list)
BRIDGER RANGE
Observer Name
Brittney Manning