Trail to Annette Lake, descent beneath Humpback
Feb. 22, 2018, noon PST
Weather: Clear>Mostly Cloudy
Snowpack: Low hazard to 4000' (Annette Lake). Generally a hard crust, which breaks down in faceting in some areas with from 2" to 6" low to medium density dry snow on top. In most areas the bond is poor (the skis slip). In addition in some areas that slid, damp snow sliding created an extremely hard (no penetration with ski crampons) bed surface. The older underlying hard interface was not directly observed. Analysis: Evidence of wind may have created new shallow slabs above the observed elevation. Nearer Annette Lake it appears warming in the last storm had little effect beyond triggering slabs and there is more soft snow. Hence, where it hasn't slid, weak layers remain for potential skier triggering at somewhat higher elevations where wind loaded. In addition some of the recent hard bed surfaces (widespread) will not support much additional load. Avalanches are likely to run in these areas again with loading.
Area Description: Annette Lake
Avalanches: Old from last weekend but amazingly widespread slabs on all observed aspects to at least 4600'. Generally 35 degrees+ starting zones.
Observation by Gary Brill
Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an Avalanche? No