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Avalanche Forecast

Archived

Jan 20th, 2021–Jan 21st, 2021

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

Regions

Glacier.

Weather Forecast

A surface ridge of high pressure will build back over Rogers Pass today. Expect cooling temperatures, sunny with cloudy periods and gusty wind. As the High-Pressure system solidifies over us tonight, we could start to see a temperature inversion, valley fog, and decreasing wind. The long term forecast is for cooler temperatures, and no precip.

Snowpack Summary

Strong winds, and a little bit of new snow overnight has created wind slabs in exposed terrain features in the Alpine and at Tree Line. The new snow sits on a variety of surfaces, including but not limited to a thin sun crust on steep S/SW asp, and SH. The Jan 10 layer is down 40-60cm in sheltered terrain at tree-line and below.

Avalanche Summary

A few size 1 wind slabs were reported yesterday in multiple MIN reports from Connaught CK. 2 loose dry avalanches were observed in the HWY corridor yesterday to size 1.5. 1 guiding operation and 1 ACMG course were in the Asulkan and Connaught drainages; both reported no new avalanches observed in the info ex.

Confidence

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.