Avalanche Forecast

Issued: Feb 7th, 2013 10:10AM

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

Avalanche Canada jlammers, Avalanche Canada

Summary

Confidence

Fair - Timing or intensity of solar radiation is uncertain for the entire period

Weather Forecast

A drying trend is expected to evolve throughout the forecast period as ridge of high pressure becomes firmly established over the region. Friday and Saturday should see a mix of sun and cloud; however, Sunday is more likely to see generally clear skies. Overnight cooling with a strong daytime solar influence becomes more likely throughout the period. Winds are expected to remain generally light and west/northwesterly.

Avalanche Summary

On Wednesday a few small, skier-triggered loose snow avalanches failed within the new snow in steep terrain.No other avalanches were reported.

Snowpack Summary

Light to locally moderate amounts of recently fallen snow have been redistributed into soft wind slabs at higher elevations. The new snow overlies a gamut of old surfaces which include: old wind slabs at higher elevations, fairly widespread surface hoar, and a melt-freeze crust on previously sun-exposed slopes. These surfaces will be something to watch as the overlying slab develops.About 35-50cm below the surface is an interface of surface hoar or a sun crust that was buried on Jan 23. Although it seems to be gaining strength in some areas, this weakness remains a concern of professionals in the region and continues to show 'sudden' fracture characteristics in snowpack tests.The snowpack below this is generally well bonded.

Problems

Wind Slabs

An icon showing Wind Slabs
Recent snow accumulations have been redistributed into wind slabs in exposed areas by moderate west winds. In steep, sheltered terrain, the recent snow may react as a loose snow avalanche.
Be cautious as you transition into wind affected terrain.>Be cautious of sluffing in steep terrain.>

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

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 3

Persistent Slabs

An icon showing Persistent Slabs
An assortment of weak crystals is buried between 35 and 50cm below the surface. Although this interface is gaining strength, triggering may still be possible in unsupported terrain.
Conditions have improved, but be mindful that persistent instabilities are still present.>Choose well supported terrain without convexities.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible

Expected Size

1 - 4

Valid until: Feb 8th, 2013 2:00PM