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Avalanche Forecast

Archived

Apr 24th, 2022–Apr 25th, 2022

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

Regions

Glacier.

Forecasts are uncertain about the timing and intensity of the incoming system tomorrow.

A rain on snow event could raise the avalanche danger to CONSIDERABLE. Be prepared to adjust your plans.

Weather Forecast

Little crust recovery is expected overnight tonight. Unsettled weather returns Monday evening with the arrival of a weakening frontal system.

Tonight: Clear periods. Alpine low 0*C. Freezing level (fzl) 1600m. Light SW wind

Mon: Flurries, 10cm. High 2*C, fzl 2300m, moderate SW wind

Tuesday: Flurries, 4cm. High  -1*C, low -6*C, fzl 1900m. Mod W wind

Snowpack Summary

A breakable surface crust can be found up to 2400m. Several crusts exist in the upper snowpack on solar aspects into the alpine.

The April 18th crust, down 5-30 cm, is widespread up to 2200m & higher on solar aspects.

Below treeline, the snowpack has gone through several melt-freeze cycles & is capped by a crust that breaks down with daytime warming

Avalanche Summary

There has been a loose wet cycle to size 2.5 this weekend with the strong solar input. One notable natural size 3 slab avalanche occurred on Friday from a West aspect at treeline on Avalanche Crest (suspected to be windslab on the April 18th crust).

Confidence

Timing, track, or intensity of incoming weather system is uncertain

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.

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.