Avalanche Forecast

Issued: Dec 7th, 2020 2:00PM

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

Avalanche Canada Mikey, Avalanche Canada

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Expect to see some snow on Tuesday along with westerly winds.

Summary

Confidence

Moderate -

Weather Forecast

Finally, I can use the "SNOW" word. Flurries are expected to start in the early hours of Tuesday morning with 10-15cm expected by evening. Let's wait and see which weather model holds true. Winds are expected to be strong SW Tuesday morning and moderate in the afternoon. Expect a high of -5c in the Alpine.  

Avalanche Summary

No new avalanche activity observed or reported.

Snowpack Summary

If the amount of snow is more than forecast or comes earlier with the winds, be mindful of fresh wind slabs.

Alpine areas have been heavily affected by the past week of strong winds and hard wind slabs are widespread at tree line and above. Ridges and ribs have been previously stripped free of snow while lee and cross-loaded terrain have deep deposits of previous wind loaded snow. The November crust is down 30-100cm and is still producing anywhere from moderate to no results. Faceting has started near the Nov. crust and is something that will be followed closely as more load gets deposited. Alpine temperatures reached near +2c on Monday. Expect some surface crusts from this warming event or from last week's warming, especially on solar aspects.

Terrain and Travel

  • Fresh wind slabs will likely form throughout the day, diligently watch for changing conditions.
  • Approach lee and cross-loaded slopes with caution.
  • Watch for areas of hard wind slab on alpine features.

Problems

Wind Slabs

An icon showing Wind Slabs

A fresh layer of wind slab is expected to build overtop of the previous hard windslabs, which are widespread in alpine areas and even down into treeline. Listen for that drummy or hollow feel as an indication to be extra careful.    

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2.5

Persistent Slabs

An icon showing Persistent Slabs

The November crust continues to be the main concern in the snowpack. Any avalanche in the upper snowpack will likely scrub down to these layers

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

1.5 - 3

Valid until: Dec 8th, 2020 3:00PM

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