21-22

A few natural new snow/wind-slabs

Sheep Creek
Cooke City
Code
SS-N
Elevation
9700
Aspect
NE
Latitude
45.03440
Longitude
-109.98400
Notes

From skiers in Cooke 1/9/21:

"Observed a couple of recent, new snow, wind slab avalanches that appeared to occur during the storm.  Upper elevation, N-E aspects, all very steep, wind loaded terrain.  Most appeared to be triggered by cornice falls, and nothing propagated very wide from what I could tell."

"Wind slab on East face of Sheep mountain today. D1.5,mid slope".

 

Number of slides
3
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
Problem Type
New Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Emigrant Peak

Date
Activity
Skiing

Saw this recent natural slide, probably a day or two old, while skiing on Emigrant. Start zone approx 10,400ft, E facing. We guessed the crown was 3-5ft deep. Evidence of wind loading on similar surrounding slopes, suggesting wind slab as culprit. 
 

Down lower, we saw pockets of wind drifts, but these were small and easy to avoid. We did not venture up near the high ridges. 

Region
Out of Advisory Area
Location (from list)
Emigrant Peak
Observer Name
Tim Benson

East Face of Mt. Ellis Summit

Date
Activity
Snowboarding

Toured up to the summit of Mt. Ellis this morning. The weather was clear skies, sunny, and a slight westerly breeze up top and along the ridge. Along the ridge we saw many small to medium sized cornices. We knocked a couple small ones off on to the slope below and they slid on a very firm wind loaded surface (pictures). There is quite a bit of firm wind loaded along on the ridge but we saw no shooting cracks or other signs of instability. We dug a pit on the East face just below the summit to evaluate the layer of facets near the ground and got an ECTX result. All signs were pointing to good stability and we enjoyed a very nice run down the Mt. Ellis Direct decent. 

Region
Northern Gallatin
Location (from list)
Mt Ellis
Observer Name
Connor Culver

South of Flanders Mountain - 9000 feet - East Aspect

Date
Activity
Skiing

Dug snow pit south of Flanders Mountain on East facing aspect @ 9000ft. Result was ECTN 27 failing on ground level facets. Approximately 95 cm of snow at non wind transported areas. Evidence of wind loading above alpine. Skied below tree line.  

Region
Northern Gallatin
Location (from list)
Flanders Creek
Observer Name
Ryan Kropp