Avalanche Forecast

Issued: Mar 20th, 2022 4:00PM

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

Avalanche Canada TRettie, Avalanche Canada

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 Carefully assess the wind slab hazard as you move through terrain. New wind slabs could build through the day. 

Summary

Confidence

Moderate - The snowpack structure is generally well understood.

Weather Forecast

Sunday night: around 5 cm of new snow expected with moderate to strong southwest winds. Low of -3 at 1500 m.

Monday: cloudy with around 5 cm of new snow expected and moderate to strong southwest winds. Freezing level rising to 1600 m.

Tuesday: cloudy with flurries bringing up to 5 cm of new snow at higher elevations. Strong southwest winds and freezing levels rising to 2100 m.

Wednesday: cloudy with the possibility of light flurries bringing trace amounts of new snow. Freezing levels falling to 1800 m. strong southwest winds in the morning trending to light in the evening.

Avalanche Summary

On Saturday one natural cornice failure was observed in the north of the region. It did not pull a slab on the slope below. A few storm slabs up to size 2 were observed on east aspects at treeline in the south of the region.

Several glide slab avalanches up to size three have been reported over the past few days in the southern part of the region.

Snowpack Summary

New wind slab can be found on north and east aspects. a melt-freeze crust from mid March exists down 20 to 40 cm on all aspects below 1500 m. multiple crusts exist on solar aspects.  

Moist snow could be observed at lower elevations.

In the north of the region, a crust/facet interface from February sits 40 to 80 cm deep and had been most problematic on north to northeast aspects around 1900-2100 m. This layer is currently considered dormant.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

Wind Slabs

An icon showing Wind Slabs

Wind slab could be found in exposed treeline and alpine terrain. Strong winds mean that wind slab could be found further down slope than expected.

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 1.5

Cornices

An icon showing Cornices

Ongoing winds have formed overhanging cornices. The likelihood of natural cornice falls can increase with warming.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Mar 21st, 2022 4:00PM

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