21-22

Natural wind slabs and wet slide, Cooke and Blackmore 5/13-5/15

Code
N-R1-D1.5-I
Elevation
10000
Aspect Range
E-NE-N-NW
Number of slides
3
Number caught
0
Number buried
0
Trigger
Natural trigger
R size
1
D size
1.5
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Natural wind slab on Blackmore

From 5/13/22: "saw a lot of recent slide activity on East facing slopes above 9000’ in Blackmore and adjacent basins. This one was at around 9800’ between Blackmore and Elephant Peak. Also the wind was ripping up top in the afternoon. Moving a lot of snow from W to E." Photo: JR Mooney

Northern Gallatin, 2022-05-18

Roller-ball to point release to wet slide

From obs 5/15/22: "We saw a point release that mobilized a slab of new snow on an East facing slope off of mt fox in cooke city. The new snow had heated up considerably during the day on Sunday. There were some older crowns below a cornice to the north of mt fox (second photo) with slide debris that extended down the whole face (600ft). Likely slid during a storm within the last week." Photo: C. Chupik

Cooke City, 2022-05-18

Many natural storm snow slab avalanches at Bridger

Bridger Bowl
Bridger Range
Code
SS-N-R2-D1.5-S
Elevation
7500
Aspect Range
NE-E-SE
Latitude
45.81560
Longitude
-110.92300
Notes

There were many similar depth, 8-12" natural crowns along the ridge that broke this morning or overnight within the recent snow that fell over the weekend.

Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
2
D size
1.5
Bed Surface
S - Avalanche released within new snow
Problem Type
New Snow
Slab Thickness
12.0 inches
Vertical Fall
300ft
Slab Width
150.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Natural wet slab on Crown Butte

Crown Butte
Cooke City
Code
WS-N-R2-D2-O
Elevation
9800
Aspect
NW
Latitude
45.05250
Longitude
-109.96200
Notes

Natural slab avalanche on Crown Butte. Appears to be a wet slab that likely occurred 5/3 or 5/4/22. This same slope slid after a heavy snow storm a couple weeks ago on 4/23. Photo: @markass406

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Wet slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Wet Snow
Slab Thickness
24.0 inches
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year