Avalanche Forecast

Issued: Dec 25th, 2011 4:00PM

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

Garth Lemke, Parks Canada

Jasper.

Intense precipitation and gusting strong winds occurring through the Icefields at 1600hrs. Merry Christmas.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Monday

Problems

Wind Slabs

Moderate W-SW winds continue to affect the area. Expected 10-15cm of snow and winds tonight will add to this problem at all elevations. The new snow will rest upon smooth windslabs, sustrugi, and loaded lee slopes. Avoid slabby feeling slopes.

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

Deep Persistent Slabs

Basal facet collapses are still possible and will remain a concern as consequences would be big if triggered. Shallow snowpack areas and rocky outcrops are trigger locations.

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

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

2 - 3

Valid until: Dec 26th, 2011 4:00PM