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Archived

Avalanche Forecast

Feb 13th, 2019–Feb 16th, 2019
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Waterton Lakes.

Storm Slabs are reactive and will increase the load on Deep Persistent Slabs.

Weather Forecast

Tonight: clear skies. -25. Light SW wind Thursday: Sun with clouds increasing in the afternoon. Isolated flurries.  Light SW wind,. Alpine high -7.Friday: Flurries. 5cm snow. Light SW gusting moderate. 

Snowpack Summary

30-45cm of new storm snow in the past 24h. This new snow sits over a variety of wind affected surfaces including pockets of Windslab near ridgetop. We expect the storm snow to be reactive to human traffic through the weekend. The Midpack is strong in deep snowpack areas but this increase in loading will stress the weak, facetted basal snowpack.

Avalanche Summary

Siz 1-1.5 Natural Avalanche activity reported from Castle Mt Ski Resort. Limited observations in Waterton.

Confidence

Avalanche Problems

Storm Slabs

Storm snow is reactive to human traffic. More specific will information available in tomorrow's forecast
If triggered the storm slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2

Loose Dry

Use caution in steep, sheltered terrain

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Deep Persistent Slabs

A layer of weak facets is lurking at the bottom of the snowpack.  This new snow may be enough to affect this basal weakness in shallow snowpack areas.
Avoid steep convexities or areas with a thin or variable snowpack.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3