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Avalanche Forecast

Archived

Nov 21st, 2022–Nov 22nd, 2022

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

Regions

Glacier.

New snow is arriving, but it lands on a thin snowpack that barely hides underlying hazards. The new snow on a weak surface will create a new avalanche hazard; however, the biggest risk is still striking hard objects and injuring oneself.

Travel with caution, take a headlamp, and be prepared to deal with any emergency within your group.

Confidence

Low

Avalanche Summary

No new avalanches have been observed in the region in the past 3 days, nor have any new MIN reports highlighted avalanches.

Snowpack Summary

The snowpack is thin and faceted, with an average depth of 30-40cm below treeline, 60-100cm at treeline, and up to 120cm in the alpine in loaded areas. These values are below threshold for burying hazards, covering creeks, and bridging crevasses. N aspects have been scoured by the cold, outflow winds last week.

Surface hoar (5-30mm) exists up to treeline in shaded/sheltered areas, while in the Alpine it is up to 3mm in sheltered features.

Weather Summary

A cold front from the Pacific will finally arrive Monday night, bringing snow, milder temps, and moderate SW winds.

Mon night: flurries, 5-10cm, Alp low -6*C, mod SW winds

Tues: flurries, 10-15cm, Alp high -6*C, mod SW winds

Wed: isolated flurries, trace snow, Alp high -7*C, mod SW winds

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • Potential for wide propagation exists, fresh slabs may rest on surface hoar, facets and/or crust.

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.