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Avalanche Forecast

Archived

Mar 10th, 2021–Mar 11th, 2021

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

Regions

Banff Yoho Kootenay.

Cold temperature and generally light winds will keep the danger LOW for one more day. New snow is accumulating in different amounts in different valleys (spring) so pay close attention to local accumulations where the alpine danger could be MODERATE.

Weather Forecast

Up to 10 cm expected in some areas by Thursday morning before it clears up and becomes a beautiful day. Sunny with cool temps (-20 to -5) through the day and relatively light winds. Temperatures will warm up for the weekend with freezing levels expected to reach 2500 m on Saturday.

Snowpack Summary

Fresh snow in spotty areas from spring squalls, but mostly firm surface crust on south aspects up to at least 2600 m with softer snow found on north aspects. Minimal recent wind effect at higher elevations except in steep, alpine gullies. Profile at 2200 m today showed the Feb. 19 and Jan. 27 facets in the upper meter but no results on column test.

Avalanche Summary

No new avalanches reported today except sluffing in alpine gullies with the short storm. On Tuesday, several large persistent slabs were reported in high north aspects and we assume these were triggered by large cornice falls.

Confidence

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.