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Avalanche Forecast

Archived

Jan 28th, 2022–Jan 29th, 2022

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

Regions

Glacier.

Low hazard doesn't mean no hazard, pockets of unstable snow may remain in steep terrain.

Cornice falls continue to be reported sporadically by our neighbors, minimize your exposure to these giant triggers.

Weather Forecast

Cloud will move in Saturday afternoon ahead of the frontal system forecast to hit our area Sunday.

Saturday: Sun to start, clouds rolling in midday. Alpine High -6*C. Moderate SW ridgetop wind

Sunday: Snow (up to 25cm). Alpine Low -8*C, High -6*C. Mod-strong SW wind

Monday: Isolated flurries. Low -19*C, High -12*C. Gusty strong SW wind

Snowpack Summary

Classic mid season drought surfaces: widespread wind-affect in exposed (SE-W-NW) terrain at treeline and above, surface hoar 5-15mm on near surface facets in sheltered terrain, and a thin breakable crust on steep solar aspects. The Jan 20 (2-4mm) surface hoar is down 35cm. The Dec 1 crust/facet combo is down ~1.5 - 2.5m.

Avalanche Summary

On Friday, a small slab avalanche was observed near the base of the Grizzly Couloir (trigger and timing uncertain).

Several solar triggered small loose snow avalanches were observed in the highway corridor from Thursday/Friday.

On Wednesday, two natural windslab avalanches occurred in the highway corridor, up to size 2, from north and south aspects.

Confidence

The weather pattern is stable

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.