Avalanche Forecast
Northwest Inland
New snowfall amounts are uncertain for Sunday. Pay close attention to how much new snow falls in your area.
Avalanche Problem 1: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Avoid steep convexities or areas with a thin or variable snowpack.
- If triggered, wind slabs may step down to deeper layers and result in large avalanches.
Avalanche Problem 2: Deep Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
The late October crust lies near the base of the snowpack with a thin layer of weak, sugary snow above it. This layer should be on a strengthening trend, but a heavy trigger in a thin snowpack area may still be enough to cause it to react.
Travel and Terrain Advice
- Be especially cautious in shallow snowpack areas where triggering a deeper layer may be easier.
- Be aware of the possibility for full depth avalanches due to deeply buried weak layers.
Avalanche Summary
No new avalanches have been reported, however it is expected that warm alpine temperatures and sunshine initiated natural activity on steep solar aspects at higher elevations on Thursday and Friday. Looking forward, expect any new snow accumulations to bond poorly with the crust and surface hoar that form our current snow surface.
Snowpack Summary
Average snowpack depths now total 80-140 cm at treeline elevations and up to 160 cm in the alpine. (Depths of up to 210 cm have been reported from the Howsons.) Solar and temperature crusts are expected to have formed on the wind-affected surface at higher elevations on Thursday. Below the surface, Approximately 30-50 cm of storm snow now overlies two crusts that were buried near the end of November. These crusts are widespread and extend into the alpine. Although snowpack tests have previously shown hard results at these crust interfaces, more recent observations have been limited. Below these crusts, a well settled mid-pack overlies the late October crust near the base of the snowpack. This "crust/facet combo" layer is widespread and has been reactive to rider and remote triggers. It also continues to produce sudden snowpack test results.
Weather Forecast
Saturday night: 2-15cm of new snow with rain at lower elevations / Strong to extreme southerly winds / Freezing level at 1300m
Sunday: 0-3cm of snow / Strong to extreme southerly winds / Freezing level at 2400m
Monday: Clear skies / Strong to extreme southerly winds / Freezing level at 2400m
Tuesday: Trace amounts of new snow / Light variable winds / Freezing level at 1200m
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New snow and wind on Saturday night may form fresh wind slabs in higher elevation lee terrain. New wind slabs may have a poor bond to the underlying snow, especially in areas where buried crusts exist.