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Avalanche Forecast

Archived

Mar 6th, 2021–Mar 7th, 2021

Alpine
Natural avalanches possible, human triggered probable.
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 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.

Regions

Glacier.

The new storm slab is reactive to skier triggering today. Extra caution is required in wind loaded areas.

Weather Forecast

Cloudy with sunny periods and isolated flurries with trace accumulation. Alpine temperature: High -7 C. Ridge wind west: 15-35 km/h. Freezing level: 1300m. A frontal system arrives sunday bringing another 9cm of new snow with cold temperatures (-8.0) and moderate to strong SW winds. A relatively stable and dry period begins Monday.

Snowpack Summary

Temperatures have begun to drop. At treeline,15cm of new snow sits atop a breakable crust and 10cm of moist snow. Localized extreme winds associated with the passing of a cold front increased snow loading near ridges. The February facet/ crust persistent weak layer is down 80-120cm.

Avalanche Summary

Warm temperatures created a moist avalanche cycle with several size 1.5-2.5 avalanches observed in the highway corridor. Early this morning the remote avalanche detection system at Rogers Pass showed 2 new avalanches, indicating a natural cycle is underway in the new storm snow.

Confidence

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.

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.