Avalanche Forecast

Issued: Apr 22nd, 2021 4:00PM

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

Avalanche Canada JSmith, Avalanche Canada

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5-10 cm. of new snow and strong southeasterly winds have formed small wind slabs sitting on hard crusts on lee features below ridgetops. Find the best riding and avoid wind slabs by seeking out wind-sheltered terrain.

Summary

Confidence

High -

Weather Forecast

  

THURSDAY NIGHT: Cloudy / Light, west ridgetop wind / alpine low temperature -11 / Freezing level valley bottom.

FRIDAY: Mostly cloudy / Light, west ridgetop wind / alpine high temperature 2 / Freezing level 2000 m.

SATURDAY: Cloudy with flurries; 5-10 cm. / Light, south ridgetop wind / alpine high temperature -3 / Freezing level 1300 m.

SUNDAY: Cloudy with flurries; 5-10 cm. / Moderate, southwest ridgetop wind / alpine high temperature 0 / Freezing level 1700 m.

Avalanche Summary

No avalanches were reported in this region on Wednesday.

NOTE: Observations are very limited during this time of year.

Snowpack Summary

5-10 cm of flurries and strong southeasterly winds have formed small wind slabs sitting on hard crusts on lee features below ridgetops. Moist snow surfaces at all elevations/aspects formed by the recent warm weather have frozen into hard crusts. Large cornices hang like Gargoyles over alpine ridgetops. Cornice falls can trigger large avalanches on slopes below that a single rider may not trigger.

The snowpack is overall strong and settled in most areas. However, steep and rocky alpine slopes with a shallow or thin to thick snowpack may still harbor deeply buried weak layers. Glide cracks releasing as full depth glide slab avalanches become more common in the spring and are extremely difficult to predict. Best practice is to avoid slopes with glide cracks.

The snow line is slowly creeping up the mountains, making some access areas snow-free. 

Terrain and Travel

  • Carefully evaluate steep lines for wind slabs.
  • Stay off recently wind loaded slopes until they have had a chance to stabilize.
  • Even a small avalanche can be harmful if it pushes you into an obstacle or a terrain trap.
  • Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet
  • Caution around slopes that are exposed to cornices overhead.

Problems

Wind Slabs

An icon showing Wind Slabs

5-10 cm of flurries and strong southeasterly winds have formed small wind slabs sitting on hard crusts on lee features below ridgetops.

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 1.5

Loose Wet

An icon showing Loose Wet

Expect small wet loose avalanches to begin running naturally on steep slopes when the sun comes out.

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

Elevations: All elevations.

Likelihood

Possible - Likely

Expected Size

1 - 1.5

Valid until: Apr 23rd, 2021 4:00PM

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