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Avalanche Forecast

Archived

Jan 30th, 2021–Jan 31st, 2021

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

Regions

Glacier.

All good things must come to an end.

Enjoy one more day of relatively benign weather before the incoming storm ramps up the hazard level considerably.

Weather Forecast

Our last day of stable weather for a few days. On Sunday a coastal low pushes a cold front inland, giving moderate snowfall and wind.

Today: Sunny periods and isolated flurries. Alpine High -8 C. Ridge wind light S.

Tonight: Flurries (8 cm). Low -7 C. Light-Moderate S wind.

Sunday: Snow (14 cm). High -5 C. Mod S wind.

Monday: Snow (18 cm). Mod S wind.

Snowpack Summary

10 cm of new snow has not yet built much of a slab over the previous drought layer (surface facets, surface hoar, wind affect, and sun crust). Ski pen of up to 35cm in sheltered area means sluff management is still key in steep terrain. The snowpack below is mostly strong rounded crystals, with critical layers from earlier this winter now dormant.

Avalanche Summary

Skier accidentals last week in the Ravens and on Avalanche Crest area good reminder that safe travel practices are always recommended in any avalanche terrain. Windslab development has been reported at and above treeline. Cornices are large and weak, approach corniced ridges with caution, and avoid hanging out beneath them.

Confidence

Intensity of incoming weather systems is uncertain

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.

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.