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Avalanche Forecast

Archived

Feb 6th, 2020–Feb 7th, 2020

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

Regions

Glacier.

Human triggered avalanches are possible today, even likely in very steep unsupported terrain features!

Weather Forecast

Mainly cloudy today, no precipitation, moderate winds from the West, and the freezing level should stay below Valley Bottom. Flurries tonight, and light snow tomorrow with accumulations up to 10cm.

Snowpack Summary

Continued mod to strong winds have been producing soft slabs on immediate lees, and cross-loaded terrain features in the alp and exposed areas of TL. We have received 30cm+ of low-density new snow at treeline and above since the atmospheric river event last weekend. Expect dust on crust at lower elevations, and rugged travel.

Avalanche Summary

Yesterday in the Highway Corridor we observed 8 avalanches on very steep Nth facing terrain. One MIN from Grizzly Glades noted multiple loose dry avalanches to size 1. Tuesday's Helicopter control on Ross Peak Slide Path produced limited results to size 2.5, one slab failed at glacier ice for the second time this Winter.

Confidence

Due to the number and quality of field observations

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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 Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.

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.