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Avalanche Forecast

Archived

Nov 25th, 2022–Nov 26th, 2022

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

Regions

Tutshi.

Recent snow accumulation and wind loading have formed fresh slabs. Seek conservative terrain choices that avoid north-aspect terrain.

Confidence

Low

Avalanche Summary

No new avalanches have been reported or observed.

Snowpack Summary

New accumulations between 10 cm and 15 cm overlie a thin snowpack. Upper elevation terrain in the direct lee of the past south wind harbors pockets up to 50 cm to 70 cm in depth with upper Alpine terrain nearing 100 cm in depth.

Coverage is minimal with many early seasons hazards such as thinly buried rocks and trees, open creeks, and weak lake ice.

Expect wind-transported snow to have formed wind slabs in the immediate lee of terrain features. Exposed upper windward terrain will continue to remain stripped down to old surfaces.

Weather Summary

Friday Night

Cloudy with snowfall, accumulation 1 cm to 5 cm, 60 km/hr southwest, alpine temperature -10 C, freezing level descending to sea level. Expected snowfall amounts in the white pass zone are to be on the high end of the forecast amounts.

Saturday

Cloudy with very light snowfall, accumulation trace amounts, 10 km/hr Northwest wind, alpine temperature -15 C, freezing level sea level.

Sunday

Cloudy with very light snowfall, accumulation trace amounts, 30 km/hr northeast wind, alpine temperature -18 C, freezing level sea level.

Monday

Cloudy with snowfall, accumulation trace amounts. 20 km/hr northeast wind, alpine temperature -20 C, freezing level sea level.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Uncertainty is best managed through conservative terrain choices at this time.

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.

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.