Avalanche Forecast

Issued: Mar 26th, 2020 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 astclair, Avalanche Canada

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Incremental snow and wind have created heightened avalanche conditions at higher elevations.

Summary

Confidence

Low - Uncertainty is due to limitations in the field data.

Weather Forecast

Thursday night: Cloudy, 5-10 cm of snow, light to moderate southwest wind, freezing level dropping to 900 m, alpine temperatures reach -5 C.

Friday: Cloudy, up to 5 cm of new snow, light southwest wind, freezing level climbing to 1300 m in the afternoon, alpine temperatures reach -4 C.

Saturday: 20-30 cm of new snow, moderate southwest wind with strong gusts at ridge-tops, freezing level climbing to 1400 m in the afternoon, alpine temperatures reach -2 C.

Sunday: 15-25 cm of new snow, moderate southwest wind with strong gusts at ridge-tops in the late afternoon, freezing level climbing to 1400 m in the afternoon, alpine temperatures reach -2 C.

Avalanche Summary

A few small dry loose avalanches were reported on Monday, however mountain travel and field observations have been very limited over the past few days. Last week there were many wet loose avalanches, but cooler weather and a dusting of new snow has probably made isolated wind slabs the main concern this week.

Snowpack Summary

Incremental snowfall that has accumulated throughout the week and that is forecast to continue through the day on Friday covers a variety of previous snow surfaces including crusts, warm snow, and wind-affected snow. There is some uncertainty about how well the new snow will bond to these interfaces. The snowpack is generally strong and settled, with the exception of some areas in the eastern and northern parts of the region that have weak faceted snow near the base of the snowpack. However, this layer is considered dormant and has not produced an avalanche since February 20.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid terrain traps where the consequence of any avalanche could be serious.

Problems

Wind Slabs

An icon showing Wind Slabs

Light accumulations of snow and recent strong southwest wind have potentially formed wind slabs in steep alpine terrain. There is uncertainty about how well these slabs will bond to underlying interfaces.

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

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 1.5

Valid until: Mar 27th, 2020 5:00PM

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