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Archived

Avalanche Forecast

Mar 7th, 2019–Mar 10th, 2019
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Waterton Lakes.

Temperatures are finally moderating allowing winds to return to the typical, strong, SW flow. Be on the lookout for building Windslabs in all exposed terrain.

Weather Forecast

Tonight: Trace precipitation with strong SW winds gusting to 80 km/h.Friday: Mainly Sunny. Alpine high -5.Strong West winds gusting to 60km/h. Saturday: Sunny. Alpine high - 4. Moderate West Winds.Sunday : Sunny. Alpine high -1. Moderate West Winds.

Snowpack Summary

Strong SW winds with extreme gusts contributing to Windslab development on Thursday. These new Windslabs sit over 10-15 cm of faceted powder in the alpine and at treeline. Surface snow below treeline is mostly unaffected by wind. The midpack is generally strong in thick snowpack locations, and is bridging weak basal facets.

Avalanche Summary

No new avalanche activity.

Confidence

Avalanche Problems

Wind Slabs

Winds have shifted from NE to SW on Thursday. Watch for Windslabs on all aspects in exposed terrain.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Use caution in lee areas. Wind loading will create slabs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Deep Persistent Slabs

The basal weaknesses are well bridged in deeper snowpack areas, but there remains the possibility to be surprised in thin snowpack areas.
Avoid thin, rocky or unsupported slopes.Avoid steep convexities or areas with a thin or variable snowpack.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Unlikely

Expected Size: 1.5 - 2.5