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Avalanche Forecast

Archived

Feb 4th, 2020–Feb 5th, 2020

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

Regions

Glacier.

Reactive pockets of windslab exist in the alpine and exposed treeline.

Assess before committing to your run.

Weather Forecast

A benign weather day. Tomorrow, a Pacific low will work to push out the Arctic air.

Today: Mainly cloudy with isolated flurries. Treeline temp -13 °C. Light SW winds

Tonight: Trace of precipitation. Treeline temps steady at -13 °C. Light SW winds

Tuesday: 6cm snow. Freezing levels rising to 1200m, treeline temp  -6 °C. Light SW ridge winds gusting 70

Snowpack Summary

We received 20-30cm of low density snow in the wake of Saturdays storm. This sits on firm surfaces resulting from the Extreme winds, 70mm of precip, and 2000m freezing level mid storm. Expect rugged travel in all but smooth open slopes below treeline - with 10-15cm of snow on a crust. Pockets of windslab exist in lees at treeline and in the alpine.

Avalanche Summary

Loose dry point releases to size 1.5 were observed yesterday from steep, rocky, solar terrain features.

During Saturday's storm, numerous size 3-3.5 avalanches were triggered both naturally and by artillery from all aspects.

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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.