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Archived

Avalanche Forecast

Feb 25th, 2012–Feb 26th, 2012
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Northwest Coastal.

Confidence

Good

Weather Forecast

Sunday: Mostly sunny, with light northerly winds and temperatures reaching -7. Monday & Tuesday: Expect the clear weather to give way to increasing clouds and flurries, and strong southwesterly winds will ease with the cloud growth. Temperatures should reach -7 in the afternoons.

Avalanche Summary

Natural avalanches up to size 2.0 and rider triggered up to size 1.0 have been reported in the past 24 hrs.

Snowpack Summary

Between 10-25cm of new snow fell in the most recent storm pulse. This adds to the previous storm snow, with 45-60 cm being an average amount over the mid February layers. These layers are a strong melt freeze crust at lower elevations (below 1000m) and wind effected snow higher in the alpine while between these elevations, the interface varies wildly from facets, surface hoar, sun crust or wind press. The surface hoar is not widespread but is responsible for much of the recent avalanche activity. With the additional wind loading, pockets as deep as 90cm are possible on lee features. Recent changes in wind direction have exacerbated the wind slab issue, with slabbing now reacting on south facing terrain features. The mid and lower snowpack is generally well settled and strong.

Avalanche Problems

Wind Slabs

Moderate winds and new snowfall have created new and reactive wind slabs on lee terrain. Recent outflow winds have compounded this problem.

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

Elevations: Alpine, Treeline.

Likelihood: Likely - Very Likely

Expected Size: 1 - 5

Persistent Slabs

This new snow may create touchy storm slabs that sit on a variety of buried weak layers. Slightly warmer temps have consolidated this slab.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1 - 5