You are here
South Side Snowpack and Avalanche Observations
On Thursday 12/30 into Friday 12/31 winds were sustained out of the NW at 20-40 mph with some gusts up to 60 mph. This was evident as I toured up Green Butte Ridge (GBR) today, the first day of 2022. Ridges have been scoured down to rock in some places and there is large sastrugi along Broadway and GBR above treeline (ATL). Although the rime crust from 12/28 limited the amount of snow available for wind transport, I observed shallow leftover wind slabs and signs of natural avalanche activity on south facing slopes. Debris was visible from two D1 avalanches off of the south side of Casaval ridge, and debris from a D1 hard slab was still visible under wind-deposited snow low down and on skiers right of Sun Bowl on a rollover (convexity). These likely occured sometime yesterday during the wind event.
I stomped some small wind slabs in safe areas along GBR. All of them were unreactive and hard (1F-P). I toured up to the top of Sun Bowl and was surprised to see very few cornices along the ridge. The one cornice that was available was kicked into the bowl to no effect except to observe that the snow surface of the upper bowl was quite firm (hard slab). As I skied back down the ridge above Sun Bowl I noticed the small hard slab avalanche debris. As I skied out through the trees the snow surface on any south facing slope with over 25 degree steepness was getting moist and sticky below treeline (BTL).
Observation Location: Sun Bowl
- Elevation: 8500'
- Date: 20220101
- Time: 1200
- Observer: Lazzeri
- Sky Conditions: CLR
- Current Precipitation: NO
- 24-hour New Snow Depth (HN24): 0
- 24-hour New Snow Water Equivalent (HN24W): 0
- Wind Direction: SE
- Wind Speed: Light