Significant wx factors to note: more snow than forecasted fell throughout the day, with the new snow coming in largely "upside down" — in cold conditions, then warm conditions on top of that. As the day progressed and the temperatures increased, the snow surface because much more moist than the snow just 10-15cm below.
Dec 30, 2022
Stevens Pass - Moonlight Area
|SS-Soft Slab||I-New/Old Interface||N-Natural||Report|
We observed a D2 avalanche on E-facing slope at ~4100', likely a product of the new loading of the storm snow (see photo)
The storm snow largely came in upside down, with 30cm of upside down storm snow on top of a stout (K) ice crust at 3600' on NW aspect. 8cm of 4F snow on top of 22cm of F snow above the Christmas rain crust. Cohesion of storm snow indicated further caution around the storm slab problem would be prudent. Christmas rain crust was supportable on skis, however boot pen averaged 25cm
Layer Depth/Date: 30cm down from surface
Weak Layer(s): Dec 25, 2022 (MF)
Was instructing an AIARE Rescue course, so we stayed below treeline. We did observe some sslabbing of the new storm snow, but did not get into wind-affected areas to observe data around the wind slab problem.