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Avalanche Forecast

Archived

Mar 27th, 2022–Mar 28th, 2022

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

Regions

Yukon.

Keep an eye on the wind. As it increases and snow starts to blow new wind slabs could form in exposed terrain.

Confidence

Moderate - Uncertainty is due to the speed, direction, or duration of the wind and its effect on the snowpack.

Weather Forecast

Sunday night: Possibility of light flurries bringing trace amounts of new snow with light southwest winds. Low of -11 at 1100m.

Monday: A mix of sun and cloud with light flurries bringing trace amounts of new snow. Moderate southwest winds. High of -3 at 1100 m. 

Tuesday: Mostly cloudy with light flurries bringing up to 5 cm of new snow with light to moderate south winds. Freezing level rising to 1000 m.

Wednesday: Cloudy with flurries bringing up to 5 cm of new snow with light to moderate southwest winds. High of -3 at 1100 m.

Avalanche Summary

On Friday ski cutting produced wind slab avalanches up to size 1.5. Several wet loose avalanches to size 1.5 were also observed, these avalanches were on steep low elevation features.

Snowpack Summary

New wind slabs could form in exposed terrain as the winds increase. Moist snow could be observed on solar aspects if the sun comes out.

A couple of sun crusts exist in the upper snowpack but none have been identified as layers of particular concern. The lower snowpack is thought to be well settled.

Terrain and Travel

  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Minimize your exposure time below cornices.

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.