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Avalanche Forecast

Archived

Apr 13th, 2021–Apr 14th, 2021

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

Regions

Glacier.

Expect the hazard to rise with daytime warming and solar radiation.

Be prepared with a conservative exit plan if freezing levels rise above forecast. 

Weather Forecast

Hello high pressure! A Rex Block has settled in, resulting in sunny and dry conditions with elevated freezing levels into the weekend.

Today: Sunny. Freezing level 1800m. Wind NE-10km/h.

Tonight: Clear. Freezing level 600m. Wind E-15km/h.

Wednesday: Sunny. Freezing level 2400m. Wind E-15km/h.

Snowpack Summary

A surface crust exists on all but northerly aspects, into the alpine. At treeline and above, a settled 30cm of snow sit on the April 7th sun crust and wind pressed surfaces. The March 18 crust is down 90cm. A very strong and dense mid and lower pack sits on up to 50cm of decomposed crusts and large facetted crystals near the ground

Avalanche Summary

A skier accidental size 2.0 occurred in the Forever Young couloir yesterday. A few small wet loose wet avalanches also occurred yesterday from very steep south facing slide paths. A cornice release size 2.0 occurred Sunday morning from the Grizzly path that faces the highway corridor.

Confidence

Timing or intensity of solar radiation 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.

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.