Very dangerous avalanche conditions exist at all elevations. Avoid all avalanche terrain.
Natural avalanche activity is expected with heavy snowfall and strong winds.
A problematic combination of weak faceted snow and/or surface hoar over a crust remains a concern at treeline. This layer will need time to adjust to the new snow load.
As storm snow continues to accumulate through the day watch for storm slabs becoming cohesive and increasingly reactive to triggers. Deeper deposits are expected in north and east facing terrain around ridgelines.
On Monday, several small loose dry avalanches were reported below treeline.
Widespread natural avalanche activity is expected to begin on Wednesday as snow and wind develop sensitive storm slabs.
Storm snow accumulates over wind-affected surfaces and old wind slabs in exposed areas and 30 to 60 cm of settling snow in sheltered areas.
Multiple weak layers exist in the upper and mid snowpack. The most concerning weak layer is a widespread crust found down 60 to 100 cm, with weak, faceted snow immediately above it. This layer will need time to adjust to the new snow load.
Tuesday Night
Cloudy with 10 to 20 cm of snow. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -8 °C. Freezing levels rise to 700 m through the night.
Wednesday
Cloudy with 30 to 50 cm of snow above the snow rain line. 60 to 80 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level rises to 1200 m.
Thursday
Cloudy with 4 to 9 cm of snow. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -6 °C. Freezing level drops to 800 m.
Friday
Partly cloudy with 1 to 4 cm of snow. 30 to 50 km/h south ridgetop wind. Treeline temperature -6 °C. Freezing level rises to 1200 m.
More details can be found in the Mountain Weather Forecast.
