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Avalanche Forecast

Archived

Jan 11th, 2021–Jan 12th, 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 unlikely, human triggered possible.
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.

Watch for pockets of fresh windslab today.

Expect the hazard to ramp up quickly on Tuesday with the incoming storm.

Weather Forecast

A weakening warm front gives flurries today.  An organized system Tuesday brings snowfall and rising freeing levels (Fzl).

Today: Flurries (5cm). Alpine High -5 C. Ridge wind moderate SW. Fzl 1300m.

Tonight: Flurries (4cm). Low -6 C.

Tuesday: Snow (16cm). High -3 C. Mod SW wind. Fzl 1400m.

Wednesday: Snow (24cm). Strong West wind. Fzl 1600m.

Snowpack Summary

New snow is covering a thin crust from sun and/or rime in exposed terrain, as well as surface hoar up to 10mm in the shaded areas at treeline and below. The Dec 26 surface hoar has been hard to locate down 70cm. The Dec 7th surface hoar/suncrust/facet layer is down 1.5m. Crusts (with some facetting) persist at the base of the snowpack.

Avalanche Summary

No new avalanches have been reported or observed.

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.