Avalanche Forecast

Issued: Nov 24th, 2020 3:00PM

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

Avalanche Canada jmacpherson, Avalanche Canada

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Strong winds and increasing. Evidence of a fairly large avalanche in the past 48hr up to size 2.5 failing on the Nov.5 crust interface. The start zone were in steeper alpine features just below rock bands. Good skiing up high in sheltered areas. 

Summary

Confidence

Moderate -

Weather Forecast

Steadily increasing winds through the day, eventually reaching up to 100km/h. There is a possibility of very light flurries later in the day. Most weather models are calling for 10cm of snow to fall on Wednesday. 

Avalanche Summary

No new avalanches observed today. When skiing around we saw evidence of an older cycle up to size 2.5 running on the Nov. 5 crust layer. They looked to have stared from close to rock features that were loading the slope below. 

Snowpack Summary

New layer found today down 40cm producing low end of moderate results on a surface hoar/new snow layer. Faceting above the Nov crust layer. The crust is buried 50 to 80cm deep and is producing moderate to hard compression test failures. In wind prone areas such as gullies and the lee side of ridges surface wind slabs 10 to 20cm thick have been observed. Cornices are much larger than normal for this time of year, failures have been observed in recent days. Overall the snowpack carries fairly well once above 2000m, but it is still relatively shallow with lots of slightly hidden hazards (rocks, stumps, etc.) lurking beneath.

Terrain and Travel

  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Approach lee and cross-loaded slopes with caution.

Problems

Wind Slabs

An icon showing Wind Slabs

Watch for windslabs in alpine areas in the upper snowpack. Gullies and ridgelines are common areas to find these issues. 

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

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 2.5

Persistent Slabs

An icon showing Persistent Slabs

Recent test results indicate moderate to hard results on facets above the Nov crust layer.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

Valid until: Nov 25th, 2020 3:00PM