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Avalanche Forecast

Archived

Feb 9th, 2021–Feb 10th, 2021

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

Regions

Glacier.

Isolated wind slabs are popping out under people in lee features in the Alpine and Tree-line.

Bundle up, carry extra warm layers, and be prepped for cold conditions!

And a BIG thanks to all the MIN users who provide great info for our forecasters!

Weather Forecast

Cold with no snow.

Today: Sunny, Alp high -20*C, light winds

Wed: Mix of sun/cloud, Alp high -20*C, light winds

Thurs: Sunny, Alp high -27*C, light NE winds

Fri: Sunny, Alp high -22*C, light NE winds

Snowpack Summary

Storm snow from last week was redistributed by strong S'ly, then NW'ly, winds. These wind slabs are beginning to facet and weaken, but are still popping out on unsupported features at higher elevations. The Jan 26 persistent weak layer (surface hoar and/or thin crust) is buried 60-80cm but has not seen activity in the last few days.

Avalanche Summary

Several MIN reports of skier-triggered sz 1.5 slabs from steep, unsupported alpine features (Christmas Couloir, Nikki's Notch, Avalanche Crest). These slabs were triggered in immediate lee areas or just off ridge-crests.

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.

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.