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Avalanche Forecast

Archived

Dec 12th, 2023–Dec 13th, 2023

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

Regions

Yukon, Tutshi, Wheaton, White Pass East, White Pass West.

Avalanche hazard will remain elevated as heavy snow and strong winds continue into Wednesday.

Confidence

Moderate

Avalanche Summary

No recent avalanche activity has been reported. However, we expect a natural avalanche cycle to occur overnight Tuesday and potentially into Wednesday with forecast snowfall and winds.

If you do go into the backcountry, consider submitting a Mountain Information Network report.

Snowpack Summary

As much as 80 cm of recent storm snow continues to be redistributed by strong southerly winds. Deep deposits of wind-loaded snow can be found in lee features, while south-facing terrain continues to be scoured by recent winds.

New snow is reportedly well bonded to an underlying crust.

Treeline snow depth is roughly 80 cm, however, snow depths overall remain highly variable.

Weather Summary

Tuesday Night

Cloudy with 20 to 30 cm of snow, south alpine wind 70 to 80 km/h, treeline temperature -3 °C.

Wednesday

Cloudy with 5 to 15 cm of snow, southwest alpine wind 50 to 60 km/h, treeline temperature -7 °C.

Thursday

Cloudy with 10 to 20 cm of snow, southeast alpine wind 50 to 70 km/h, treeline temperature -4 °C.

Friday

Mostly cloudy with 2 to 10 cm of snow, southwest alpine winds 20 to 30 km/h, treeline temperature -8 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Wind slabs are most reactive during their formation.

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.