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Archived

Avalanche Forecast

Feb 24th, 2020–Feb 27th, 2020
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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

Regions: Waterton Lakes.

10-20cm of recent storm snow has fallen on a variety of surfaces, and slabs will become increasingly reactive with sun and strong winds on Tuesday.

Weather Forecast

Tuesday: Sun and cloud with isolated flurries, and moderate SW ridgetop winds. Alpine high -9 with an inversion settling in overnight.

Wednesday: Similar to Tuesday with strong NW winds at ridgetop

Thursday: Mainly cloudy with flurries, continued strong NW winds and a high of -7.

Snowpack Summary

10-20cm of low density new snow sits on a variety of wind affected surfaces including previous windslab, suncrusts and the February 1 melt freeze crust, which exists up to approx 2100m. As winds increase this new snow will be blown into windslabs in lee areas. The midpack is strong, though weaker basal facets can be found in thin areas.

Avalanche Summary

Neighbouring operations reported skier triggered avalanches to size 1 in the new storm snow on Sunday.

Confidence

Avalanche Problems

Storm Slabs

15-25cm of new snow paired with increasing  SW-NW winds and through the forecast period will create reactive slabs in the alpine and treeline, especially in lee areas.

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Use caution in alpine and open treeline lees. Recent snowfall has created storm slabs.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2