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Avalanche Forecast

Archived

Feb 10th, 2022–Feb 11th, 2022

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.

Backcountry travelers keep finding slopes where the Jan 29th surface hoar is ripe for triggering.

Be extra cautious with your route selection around treeline, especially if you are pushing into terrain that is a little off the beaten bath.

Weather Forecast

A ridge of high pressure will be with us for the weekend, with mostly sunny skies and warm daytime temps.

Tonight: Clear periods. Alpine Low -11*C. Ridgetop winds moderate Northwest.

Friday: Mostly sunny. High -4*C. Freezing level (Fzl) 1000 m. Light West wind.

Sat: Mainly sunny. Low -4*C, High -1*C. Fzl 1600 m. Light W wind.

Sunday: Sun. Fzl 1700m.

Snowpack Summary

5-10cm of new snow has been redistributed by strong S'rly wind in the alpine. Expect windslabs in lees, and scoured sun crust on steep solars.

Rain/warm temps will give us a crust on all aspects below 1650m.

The Jan 29th SH layer is buried ~50-80cm depending aspect and elevation, and remains triggerable in isolated locations (see avalanche problems).

Avalanche Summary

There were a few size 2-2.5 avalanches in the steep terrain above the highway corridor Thursday.

Several reports of skier triggered avalanches on the Jan 29 Surface Hoar Layer in the past few days...

Somewhere in the Asulkan?

The Hourglass.

Bonney Moraines - MIN, MIN, MCR, and an additional Sz 1.5 with a partial burial.

Confidence

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.

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.