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Small Wind Slab Avalanche, Middle Peak, Castle Lake
Location Name:Castle Lake
Date and time of observation:Mon, 02/15/2021 - 11:30am
Observation made by:Forecaster
Recent avalanche activity
Whumphing noises, shooting cracks, or collapsing
Recent loading by new snow, wind, or rain
96067 Mount Shasta , CA
United States41° 13' 11.1072" N, 122° 23' 0.9168" W
See map: Google Maps
Snow shower continued until 9 a.m. Fog would move in and out with scattered clouds as we toured up to Middle Peak. Temperatures were rising. A high of 43.5 ºF was recorded at 1 p.m. at our Castle Lake weather station. Roller balls and pinwheels were forming on south aspects. It would have been a perfect day to build a snowman. Moist packable snow was everywhere.
Cloud Cover:50% of the sky covered by clouds
Air temperature:Above Freezing
Air temperature trend:Warming
We triggered a small avalanche on a test slope by cornice fall today. The result was a small wind slab avalanche. It was approximately 20 feet wide and 20 feet long. The bed surface was a thin icy crust. The crust was 12 inches deep in a pit we had dug earlier. Temperatures were warming up and snow surfaces were beginning to feel moist and heavy. The trees were dripping melting snow.