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Avalanche Forecast

Archived

Apr 20th, 2021–Apr 21st, 2021

Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.

Regions

Glacier.

I LOVE when melt/freeze crusts allow you to travel super-fast everywhere! Get up and get going EARLY, then be back at the parking lot by noon, before the warm, sloppy avalanches start chundering down.

Just make sure the permit areas are open!!

Weather Forecast

One more day of splitter bluebird skies, then cloud moving in with minor rain/snowfall Thurs/Fri.

Today: Sunny. FZL 2100m. Winds calm.

Wed: Mix of sun and cloud. FZL 2200m. Ridge winds W, 15-35km/h

Thurs: Mix of sun and cloud with isolated flurries. FZL 1700m. Ridge winds NE 10-20km/h

Snowpack Summary

A solid melt/freeze crust covers the landscape except high N aspects, where one can find loose, dry snow. These hard surfaces will break down with the strong April sun beating down on them, especially at lower elevations. The April 7th layer is down 20-40cm depending on aspect and elevation, and the March 18th crust is down 60-100cm.

Avalanche Summary

No new major avalanches observed in the last 24hrs.

Explosives control Saturday afternoon had good success bringing down moist and wet avalanches to sz 3 on solar aspects.

Confidence

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

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.