Avalanche Forecast

Issued: Apr 21st, 2023 4:00PM

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

Avalanche Canada AL, Avalanche Canada

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Although we’ve entered spring, we still have a winter snowpack with a weak basal structure. The only way to reduce risk when dealing with the basal weak layer is avoidance.

Summary

Confidence

Moderate

Avalanche Summary

A few small natural loose dry avalanches were noted along the highway corridor Friday. No new slab avalanches were observed or reported today.

Snowpack Summary

A new surface crust has formed on solar aspects to ridge crest. On northerly aspects, up to 40cm of recent storm snow remains preserved. Multiple buried crusts are present in the mid-pack on solar aspects. The basal snowpack remains weak with facets and depth hoar.

Weather Summary

A trough of low pressure will form over the forecast region bringing cloud cover and light precip. A mix of snow and rain will fall at the valley bottom as freezing levels climb to 2200 through the day. Minimal accumulation is expected over higher terrain. Winds will remain in the light to moderate range in the alpine.

Terrain and Travel Advice

  • Avalanche hazard may have improved, but be mindful that deep instabilities are still present.

Problems

Deep Persistent Slabs

An icon showing Deep Persistent Slabs

The weak basal facets and mid-pack facets/crusts remain a concern, and will remain so for the foreseeable future.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

2 - 3

Wind Slabs

An icon showing Wind Slabs

Surface instabilities remain a concern in the high alpine. This problem presents itself as a surface slab and is primarily a concern where it overlays a crust or in steep loaded lee terrain.

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 2

Valid until: Apr 22nd, 2023 4:00PM

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