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Archived

Avalanche Forecast

Feb 12th, 2021–Feb 13th, 2021
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
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

With temps below -20 C, and daily MIN reports of skiers/riders triggering avalanches, it doesn't really seem like the time to tackle big objectives.

Weather Forecast

Temperatures will gradually warm up through the weekend as the Arctic high begins to break down.

Today: Sunny, Alpine High -17 C, Moderate Northerly winds.

Tonight: Clear, Low -18 C, Moderate E wind.

Saturday: Mix of sun and cloud, High -16 C, light SE wind.

Sunday: Sunny with cloudy periods. Low -16 C, High -15 C. Light S wind.

Snowpack Summary

Renewed Northerly winds have added to previously formed slabs in exposed areas, these are facetting quickly, but remain reactive in lees. Facetting of surface snow is also making sluffs possible in steep terrain. A weak interface of a suncrust with facets and surface hoar, was buried in late January and is now down 60-100cm. Cornices are weakening.

Avalanche Summary

Skiers triggered windslabs on the standard uptrack for Avalanche Crest yesterday.

A group of skiers had a close call Wednesday on the South face of Corbin Peak, triggering a couple of large avalanches on the Jan 24th persistent weak layer.

A skier-triggered sz 2 windslab on Bagheera was reported Tuesday.

Confidence

Due to the number and quality of field observations

Avalanche Problems

Wind Slabs

Alpine winds have been steadily blowing moderate from the North for the past 36hrs; expect windslabs in unusual places.

  • Be careful with reverse loaded pockets of wind slab at ridgeline.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5

Persistent Slabs

The January 24th weak interface may be triggerable on solar aspects, where facets and/or surface hoar is sitting on a suncrust.

The bond at this interface may be weakening, with cold temps promoting facetting.

  • Dig down to find and test weak layers before committing to a line.
  • Be wary of slopes that did not previously avalanche

Aspects: South East, South, South West.

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 1.5 - 3