Avalanche Forecast

Issued: Feb 12th, 2012 9:23AM

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

Avalanche Canada jfloyer, Avalanche Canada

Summary

Confidence

Fair - Timing or intensity of solar radiation is uncertain on Monday

Weather Forecast

Monday: Mainly sunny conditions, with light northwesterly winds. Freezing level at valley bottom. Tuesday: A weak frontal system will bring 5-10 cm new snow with some gusty southwesterly winds. Freezing level should rise slightly to around 500 m. Wednesday: another weak frontal system arrives late in the day, bringing further light precipitation.

Avalanche Summary

Slab avalanches from glide cracks have been reported near Terrace up to size 2.5, releasing from steep, smooth, rocky areas. Wet snow slides have also been reported in moist snow at low elevations.

Snowpack Summary

5-10 cm of new snow at treeline and above has buried a surface hoar layer (crystal size reported to be 1-4 mm) lying on old surfaces comprising crusts and variable wind slabs. The crusts formed in response to successive melt-freeze cycles and are harder and thicker the lower in elevation you go. The wind slabs were deposited on a variety of aspects and are becoming increasingly stubborn and difficult to trigger. Deeper within the snowpack, a facet layer buried around Jan 20th is the greatest concern. This layer lies approximately 110-140 cm below the surface and still exhibits hard, sudden planar results in isolated snowpack tests.

Problems

Wind Slabs

An icon showing Wind Slabs
Isolated new wind slabs are developing in the lee of exposed terrain features.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 4

Valid until: Feb 13th, 2012 3:00AM