Avalanche Forecast

Issued: Feb 25th, 2012 9:21AM

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

Avalanche Canada mpeter, Avalanche Canada

Summary

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.

Problems

Wind Slabs

An icon showing 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

An icon showing 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

Valid until: Feb 26th, 2012 8:00AM