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Archived

Avalanche Forecast

Mar 17th, 2022–Mar 20th, 2022
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.

Tuesdays storm brought wet flurries below treeline but a refresh at higher elevations. Ski quality was better than expected on Wednesdays field day.

Small wind slabs are still susceptible to human triggering in alpine and treeline lees.

Weather Forecast

Friday: Cloudy with isolated flurries. Strong to extreme strong SW winds. Alpine high -1. Freezing level 1800m.

Saturday: Cloudy with isolated flurries. Strong gusting extreme SW winds. Alpine high 0. FL 1800m.

Sunday: Cloudy with isolated flurries, amounting to 5 cm . Clearing near noon. Moderate SW winds. Alpine high -5. FL valley bottom.

Snowpack Summary

30 cm of new snow with moderate to strong south west winds  have created new wind slabs 30-60 deep in alpine and treeline. This overlies old windslabs and the March 3 rain crust. Feb 15 crust down 70-120 cm exists up to 2000m. Lower snowpack is well settled 1F to P. HS 250-300 cm near the continental divide.

Avalanche Summary

On tuesday a wet loose cycle occurred during the storm with a few natural to size 2. Adjacent tenures have reported isolated large wind slab avalanches to size 3. As always keep those Mountain Information Network observations coming.

Confidence

The weather pattern is stable

Avalanche Problems

Wind Slabs

Tuesdays 30 cm of snow and strong winds have created windslabs in treeline and alpine lees. Though natural activity has tapered it still remains possible to human triggering.

  • Use caution in lee areas. Recent wind loading have created wind slabs.
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5