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Avalanche Forecast

Archived

Nov 27th, 2020–Nov 28th, 2020

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

Regions

Yukon.

A storm approaching Saturday and Sunday will gradually build avalanche danger, particularly on exposed slopes.

Confidence

Low - Uncertainty is due to the limited number of field observations.

Weather Forecast

FRIDAY NIGHT: Dry, light winds and temperatures around -6C.

SATURDAY: 5-10 cm new snow starting around noon. Strong southeasterly winds. Temperatures around -8C.

SUNDAY: 10-20 cm new snow. Strong southerly winds. Temperatures around -6C

MONDAY: 2-4 cm new snow. Moderate southerly winds. Temperatures around -8C.

Avalanche Summary

No avalanches have been reported but there have been no recent observations submitted.

Snowpack Summary

The winter snowpack is starting to fill in with snowpack depths at White Pass in the region of 100-130 cm. Expect to see around 15 cm relatively low density snow overlying older snow, which may be hard where it had previously been blown by the wind.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • In times of uncertainty conservative terrain choices are our best defense.

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.