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Archived

Avalanche Forecast

Feb 20th, 2023–Feb 21st, 2023
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Birkenhead, Duffey, South Chilcotin, South Coast Inland, Stein, Taseko.

Overnight snowfall amounts Monday are uncertain. That being said, wind slabs will be the main concern as moderate to strong winds are expected to blow in the alpine and treeline.

Confidence

Moderate

Avalanche Summary

Most recent reports indicate wind slab avalanche activity to size 1 and 1.5 in the alpine.

Snowpack Summary

Recent new snow accumulation is being redistributed by moderate southwest winds.

A melt-freeze crust from late January can found down 60-80 cm. At the moment this layer appears to be gaining strength though in isolated areas small facets can still found above the crust.

There is a widespread weak layer of large sugary of facets at the bottom of the snowpack. . Snowpack depths around treeline range between 150 to 250 cm.

Weather Summary

Monday Night

Cloudy with flurries, accumulation 5-15cm. Wind moderate to strong southwest. Treeline temperature -5 °C. Freezing level 1000 m.

Tuesday

Mainly cloudy with isolated flurries, accumulation 1-3cm. Wind light to moderate northeast. Treeline temperature -7 °C. Freezing level 500 m.

Wednesday

Mainly cloudy. Wind light to moderate east and northeast. Treeline temperature -14 °C.

Thursday

Mix of sun and cloud. Wind moderate northeast wind. Treeline temperature -16 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.

Avalanche Problems

Wind Slabs

Recent new snow combined with moderate wind from a variety of directions has promoted new wind slab formation on a variety of aspects.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Deep Persistent Slabs

A layer weak facets sits near the base of the snowpack. This layer is most likely to be problematic in steep, unsupported, wind-loaded terrain in the northern part of the region (Hurley).

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 2 - 3.5