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Avalanche Forecast

Archived

Apr 21st, 2022–Apr 22nd, 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, 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.

A spring storm could bring up to 15 cm of new snow, with rain below treeline tonight and tomorrow.  Hazard is moderate if the forecast amounts come true.

Weather Forecast

Spring flurries tonight and Friday, possible mod to heavy rain/snow, FZ Lvls remain elevated through Sunday

Tonight: Flurries, up to 15 mm possible, FZL 1500m, light ridge winds

Fri: Cloudy with sunny periods and isolated flurries, Alp high -2*C, FZL 2000m, light W winds

Sat: Cloudy with sunny periods, Alp high -2*C, FZL 2000m, light W winds

Snowpack Summary

Uncertain amount of snow/rain forecast for Thurs night / Fri, will refresh surfaces at treeline and alpine. This will cover 20 cm of storm snow that fell on Tuesday, with strong SW winds. The April 18th interface, down 5-30 cm which is a crust on all aspects up to 2200 m and into the alpine on solar aspects. The below treeline crust is supportive.

Avalanche Summary

No new natural avalanches have been observed recently. No reports of human triggering of recent storm snow in the park.

Neighbours are reporting reactive storm snow on top of an April 18th Crust.

Confidence

Intensity of incoming weather systems is uncertain on Friday

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.

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.