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Avalanche Forecast

Archived

Mar 10th, 2022–Mar 13th, 2022

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Waterton Lakes.

Use extra caution in wind effected lees, sheltered areas will also provide the better skiing.

Weather Forecast

Friday: Winds increasing through the day and into the night with partially cloudy skies. Temp rising to -5 in the alpine.

Saturday: Temps continue to rise to 0 in the alpine. Clear skies and winds decreasing from extreme to strong.

Sunday: Alpine temps dip just below 0 with flurries through the day. Moderate to strong SW winds.

Snowpack Summary

M-S SW winds are forming windslabs up to 70cm deep, this overlies old windslabs and a March 3 rain crust. An additional 50 cm of settling snow over the Feb 15 crust that exists up to 2000m. Lower snowpack is well settled 1F to P. HS 250-300 cm near the continental divide.

Avalanche Summary

A natural windslab cycle has occurred in the last 24h with results up to size 3. A size 2.5 windslab avalanche was observed at the south end of Forum ridge. It is suspected that this new avalanche failed on a re-loaded bed surface from the large size 3 last week. As always keep those Mountain Information Network observations coming.

Confidence

Wind effect is extremely variable

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.