Avalanche Forecast

Issued: Dec 6th, 2011 2:18PM

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

edwin knox, Parks Canada

Waterton Lakes.

12cm of new snow the past few days with strong southwest winds along the Divide creating a highly variable snow pack in open areas. We have good early season snow conditions with a supportive mid pack. 60cm snow pack depth at Little Prairie.

Summary

Problems

Wind Slabs

Strong westerly winds this week have created the potential for surface slabs over this heavier mid pack. Isolated, small avalanches involving near surface layers were observed on Tuesday. Be cautious in wind loaded terrain.

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Deep Persistent Slabs

No real change in the base of the snowpack. The crust and facet layer is now buried a bit deeper, and will probably require a large load to trigger an avalanche. Don't be this trigger, as full depth, dangerous releases are still possible.

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

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

2 - 4

Valid until: Dec 9th, 2011 4:00PM