Avalanche Forecast

Issued: Jan 31st, 2023 4:00PM

The alpine rating is moderate, the treeline rating is low, and the below treeline rating is low. Known problems include Wind Slabs.

Avalanche Canada shorton, Avalanche Canada

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Watch for unstable slabs on steep wind-affected slopes.

Summary

Confidence

High

Avalanche Summary

No significant avalanches were reported over the last few days. The last notable avalanche activity was at the end of last week, when several wind slabs avalanches were reported during a period of northerly wind. Riders should continue to be cautious around isolated pockets of wind slabs at treeline and alpine elevations.

Snowpack Summary

5 to 15 cm of new snow is falling on a mix of crusts and hard wind-affected snow. Recent northerly outflow winds affected open areas in the alpine and treeline, souring windward slopes and creating pockets of stiff wind slabs in lee areas. A thin breakable crust can be found at or near the surface on all aspects at treeline and above. This crust is thick and supportive below treeline and on steep solar aspects.

A crust from mid-January can be found down 40 to 70 cm deep. A number of weak layers exist within the middle and lower snowpack, but the thick crusts sitting above them make triggering avalanches on these layers unlikely. The areas of concern in terms of triggering a deeper layer are shallow rocky areas.

Weather Summary

Tuesday night

Overnight flurries with 5 cm of snow around Squamish/Whistler and 10 cm around Powell River, 30 km/h southwest wind, treeline temperatures around -8 ˚C.

Wednesday 

Flurries continue through the morning with another 3 to 5 cm of snow, cloudy in the afternoon, 30 to 40 km/h southwest wind, treeline temperatures warm to -5 ˚C.

Thursday

Mostly cloudy with some sunny breaks, no precipitation, 30 to 50 km/h south wind, treeline temperatures warm to -3 ˚C.

Friday

Stormy with 20 to 30 cm of new snow, 40 to 70 km/h south wind, treeline temperatures warm to -3 ˚C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Approach lee and cross-loaded slopes with caution.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • If you are increasing your exposure to avalanche terrain, do it gradually as you gather information.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.

Problems

Wind Slabs

An icon showing Wind Slabs

Wind slabs avalanches are possible in alpine terrain and along ridges. With the incoming weather expect new wind slabs to form on north and east facing slopes, while previous outflow winds have left stiff wind slabs on south and west facing slopes. These slabs may be more reactive where they overlie a hard crust layer.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Feb 1st, 2023 4:00PM