20-21

Natural avalanches near Lionhead Ridge

LIONHEAD AREA
Lionhead Range
Code
SS-N-R2-D2-O
Elevation
9000
Aspect
SE
Latitude
44.72920
Longitude
-111.32300
Notes

On 1/23/21 we saw a couple recent natural avalanche crown on Bald Peak near Lionhead Ridge. Estimated 2-3 days old.

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
24.0 inches
Vertical Fall
1200ft
Slab Width
420.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Snowmobile triggered on Sheep Mtn, Cooke

Sheep Mountain
Cooke City
Code
SS-AMu-R2-D2-O
Elevation
9800
Aspect
S
Latitude
45.07220
Longitude
-109.92800
Notes

Snowmobilers triggered two avalanches on 1/22/2021. A group of 11 were climbing on the southside of Sheep Mountain. The slides were triggered by two separate riders.

 

 

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
36.0 inches
Vertical Fall
250ft
Slab Width
100.00ft
Weak Layer Grain type
Near surface faceted particles
Weak Layer grain size
1.00mm
Weak Layer Hardness
F
Slab Layer Grain Type
Wind Broken precipitation particles
Slab Layer Hardness
P
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Natural avalanches near Maid of the Mist

Maid of the Mist
Northern Gallatin
Code
SS-N-R1-D1.5
Latitude
45.41640
Longitude
-110.97000
Notes

From skier in Hyalite on 1/23/21: "I observed a couple older (1-2 week) naturals on E/ESE aspects in the Divide basin, and newer (1-3 days) naturals on the NE side of Divide and an east aspect at the head of the Maid of the Mist basin."

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
1
D size
1.5
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year