Avalanche Forecast
Issued: Dec 22nd, 2019 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs, Loose Dry and Deep Persistent Slabs.
Deryl Kelly,
Parks Canada
Highway 93N and Maligne Road will remain closed overnight Sunday, into Monday due to significant avalanche debris across the highway. Check Alberta 511 for updated road opening details.
Summary
Weather Forecast
Last of the recent storm passing through the region; followed closely behind by light SW winds, lower RH levels and broken skies. Seasonal cool temps headed into Christmas with daytime highs to -8, lows -15.
Snowpack Summary
New snow fallen in the last 48 hours with very little wind effect and variable slab cohesion. This overlies wind slab and a variety of weak layers near the ground.
Avalanche Summary
Widespread avalanche activity on all aspects and elevations up to size 3.0. Many dry loose avalanches below treeline and above, numerous storm slab avalanches below treeline and above.
Avalanche Control on the Icefields parkway produced numerous slides upto size 3.
Confidence
Problems
Storm Slabs
Expect many soft slab avalanches on all aspects and elevations up to size 3 Sunday
- If triggered the storm slabs may step down to deeper layers resulting in large avalanches.
- Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Loose Dry
Steep features
- If triggered dry loose point releases can form deeper deposits in terrain traps.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Deep Persistent Slabs
Dry loose and storm slab avalanches may step down to weak layers close to the ground producing large avalanches
- If triggered the storm/wind slabs may step down to deeper layers resulting in large avalanches.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 23rd, 2019 4:00PM
