Avalanche Forecast

Issued: Dec 29th, 2020 3:00PM

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

Avalanche Canada jmacpherson, Avalanche Canada

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Keep a good eye on changing depth of snow, as well as the variable wind slabs. Even though stability is improving daily it is still a December snow pack and there are still lots of spots to get into trouble. Good skiing can be found in sheltered areas.  

Summary

Confidence

High -

Weather Forecast

Temperatures down in the -23 range overnight and in valley bottoms with a daytime high near -10 at Treeline. Wednesday may bring some light flurries, but accumulations will be minimal.

Avalanche Summary

No new avalanches observed today. With the clear weather we are still seeing the evidence of the pre Christmas avalanche cycle. 

Snowpack Summary

This surface snow is soft and fluffy in some areas, and wind affected in others, especially as you transition to the Alpine. Extensive wind slabs were formed in the pre-Christmas storm, and it is worth noting that the storm arrived with extreme Northerly winds, which switched to extreme SW winds in the following days. Therefore, the region has buried wind slabs on virtually all aspects. The depth and character of these slabs is highly variable, and it is worth a dig before committing to more aggressive terrain. Forecasters are still tracking the Dec 8th layer (surface hoar, facets, crust) now down 40 to 80cm, but this layer has been inactive in recent days. The November rain crust is also worth keeping an eye on especially in shallow snowpack areas where it might be possible to skier trigger this layer, If or when it slides it will end up bing a large avalanche.

Terrain and Travel

  • Avoid areas where the snow feels stiff and/or slabby.
  • Avoid convexities, steep unsupported terrain and rocky outcroppings.
  • Avoid lee and cross-loaded terrain.
  • Be especially cautious as you transition into wind affected terrain.
  • Seek out wind sheltered terrain below treeline where you can avoid wind slabs and find great riding.

Problems

Wind Slabs

An icon showing Wind Slabs

Wind slabs (now buried by up to 15cm of recent snow) are widespread. In steep and unsupported terrain, they could be sensitive to human triggering.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1.5 - 2.5

Deep Persistent Slabs

An icon showing Deep Persistent Slabs

Recent avalanches have stepped down to this layer triggerring large avalanches. 

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

2 - 3.5

Valid until: Dec 30th, 2020 3:00PM