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Avalanche Forecast

Archived

Apr 20th, 2022–Apr 21st, 2022

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

Regions

Glacier.

Watch for recently deposited wind slabs on lee features. These overlie a crust up to 2250 m and higher on solar aspects.

Weather Forecast

A spring storm on Friday will bring light to mod precip, warm and dry for the weekend.

Tonight: Sun and cloud, FZL 700m, light SE winds

Thurs: Cloudy wtih sunny periods and isolated flurries, Alp high -1*C, FZL 2000m, light SW winds

Fri: Flurries, 10 cm, Alp high -3*C, FZL 1900m, light NW winds

Snowpack Summary

Approx 20cm of new snow and strong, gusty SW winds at Treeline have buried a supportive crust (5-20cm thick, up to ~2200m) or variable soft to hard wind slab in the Alpine. Fresh wind slabs likely in lee areas Treeline and above. Expect warmish "dust on crust" as you ascend up valley, bring your glide wax!

Avalanche Summary

Limited Natural activity observed Tuesday with poor visibility. Neighbours are reporting reactive storm snow on top of an April 18th Crust.

Confidence

Due to the number of field observations

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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.