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Avalanche Forecast

Archived

Nov 30th, 2020–Dec 1st, 2020

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

Regions

Yukon.

Lots of snow, strong to extreme wind and warm temperatures through Tuesday and Wednesday are ingredients for HIGH avalanche danger. It's a good time to minimize your exposure to avalanche terrain through the next few days.

Confidence

Moderate - Uncertainty is due to limitations in the field data.

Weather Forecast

MONDAY Night: Flurries, accumulation 5-10 cm / Strong south southwest wind / Alpine temperature around -7 C.

TUESDAY: Snow or possible rain, accumulation 15-25 cm / Strong to extreme southwest wind / Alpine temperature around 0 C / Freezing level 1500 m.

WEDNESDAY: Snow, accumulation 20-30 cm / Strong to extreme southwest wind / Alpine temperature around 0 C / Freezing level 1500 m.

THURSDAY: Mainly cloudy with sunny breaks and isolated flurries / Moderate to strong southwest wind / Alpine temperature around -3 C / Freezing level 900 m.

Avalanche Summary

No new avalanches reported in the past few days. Expect to see avalanche activity increase as the region receives a substantial amount of snow, strong to extreme winds and warm temperatures.

Snowpack Summary

The winter snowpack is growing and settling. Winds are moving it around which is helping fill in creeks and gullies at the expense of windward slopes and terrain bulges being stripped. Anywhere from zero to 150 cm. On Monday, our Fraser weather station in the trees was showing 99 cm. Winds are expected to increase dramatically in the coming days so expect the surface snow and any new snow to be re-distributed into the lee of terrain features.

Terrain and Travel

  • Minimize exposure during periods of heavy loading from new snow and wind.
  • Watch for fresh storm slabs building throughout the day.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.

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.