Avalanche Forecast

Issued: Feb 26th, 2012 9:00AM

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

Avalanche Canada mpeter, Avalanche Canada

Summary

Confidence

Good

Weather Forecast

Monday: A mostly sunny day, with moderate northerly winds and temperatures reaching -5. Tuesday & Wednesday: Expect clouds to build, with light snow developing late Tuesday and tapering into Wednesday afternoon. Winds should turn southerly but remain light with temperatures reaching -5 in the afternoons.

Avalanche Summary

We have reports of explosive and natural avalanches up to size 2.5, with the largest avalanches releasing on exposed north facing terrain. Rider triggered avalanches linger in the 1.0-1.5 size range.

Snowpack Summary

Another 15cm of new snow brings the total settled storm snow to around 60cm. This storm was initially accompanied by moderate to locally strong south and west winds, yielding intense slab production on North through East facing terrain at treeline and in the alpine. Windslab releases on north facing terrain have been as deep as 100cm. At the tail end of the storm, winds turned northerly, loading exposed south facing terrain. The new snow overlies a variety of wind modified surfaces, crusts at lower elevations and small islands of surface hoar in sheltered areas. Easy shears persist in the new storm snow (decomposing fragments down 25cm) while the deeper interface (down 60cm) is beginning to show signs of improved bonding. Below this, the mid and lower snowpack is well bonded and strong.

Problems

Wind Slabs

An icon showing Wind Slabs
Recent wind shift (from southwest to north) has exacerbated the windslab problem.

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

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 5

Storm Slabs

An icon showing Storm Slabs
Storm slabs linger as an avalanche problem in areas where they overlie buried crusts, facetted snow, and/or sheltered areas with buried surface hoar.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 4

Valid until: Feb 27th, 2012 8:00AM