24-25

New Snow Avalanches North of Cooke City

Round Lake
Cooke City
Code
SS-N-R2-D2-O
Latitude
45.07460
Longitude
-109.90700
Notes

Went snowmobiling north of Cooke City today near Round Lake. I saw about 20cm of new snow. I also saw some avalanches. There were a couple on E Henderson, one that I think happened today, a few on E Sheep Mountain, some shallower avalanches, and plenty of loose dry snow moving around in the steeps. Here are some photos. Some looked like they were from today, some are older. Lots of evidence of wind from the past day or so. 

Number of slides
3
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
Images
A couple of shallow avalanches
E Sheep Mountain
E Sheep Mountain, north end
Snow Observation Source
Avalanches North of Cooke City
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year
24-25

Natural storm slab avalanches Mt Blackmore

Mt Blackmore
Northern Gallatin
Code
SS-N-R1-D1.5-S
Elevation
9500
Aspect Range
N & E
Latitude
45.44440
Longitude
-111.00400
Notes

Avalanche Activity

We spotted 6-7 storm slabs that failed about 8-10 inches deep. There were 3 on the East face Blackmore, 1 on the north face, 1 on north facing flank, and 1 notable one in a steep below treeline cirque ENE facing (this one broke ~400 ft wide). A possible 7th was down the Fox creek drainage. It seemed a bit random where they happened and didn't. They likely occurred sometime late yesterday afternoon during snowfall and high winds. This instability should be mostly stabilized by tomorrow.

We didn't see any avalanches that broke deeper in the snowpack

Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
1
D size
1.5
Bed Surface
S - Avalanche released within new snow
Problem Type
Storm Slab
Images
Blackmore SS avalanche 400' wide - 9 Jan 2025
Blackmore SS avalanches E face - 9 Jan 2025
Snow Observation Source
Deep snow in Hyalite
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year
24-25
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