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Avalanche Forecast

Archived

Feb 2nd, 2022–Feb 3rd, 2022

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

Regions

Yukon.

A ton of new low-density snow has blanketed the region. Heads up for widespread and reactive storm slabs once the new snow starts to settle and consolidate into a slab. They could avalanche further than expected due to the poor bond with the underlying snow surfaces.

Confidence

Moderate - Uncertainty is due to how quickly the snowpack will recover and gain strength.

Weather Forecast

Wednesday Night: Trace of new snow with moderate to strong northerly winds at ridgetop. Alpine temperatures near -15.

Thursday: Another 5-10 cm of snow with gusty North winds up to 60 km/hr and switching from the southwest later in the day. Alpine temperatures near -15.

Friday: Continued snow flurries possibly adding another 5 to 10 cm with strong southwest wind at ridgetop. Average alpine temperature near -10. 

Saturday: Mix of sun and cloud with some isolated flurries. Ridgetop wind strong from the West. Alpine temperatures near -10.

Avalanche Summary

Numerous size 1 dry loose and soft slabs ran naturally and were easily reactive to skier triggering on Wednesday. 

Touchy storm slabs are likely on Thursday. They may run far and fast due to the weak bond between the underlying snow surfaces. 

Snowpack Summary

Up to 45 cm of low-density storm snow fell by Wednesday. The snow is showing a weak bond to old snow surfaces but has lacked slab development. Once settlement and wind affect kick in, expect the slab to change and be highly reactive. Changing winds may load atypical slopes and features. The new snow is sitting on surface hoar crystals on Northerly aspects/ sheltered terrain and on firm old snow surfaces. These will likely show a poor bond. 

In shallow snowpack areas a layer of loose facets sits at the bottom of the snowpack.

Terrain and Travel

  • Watch for changing conditions today, storm slabs may become increasingly reactive.
  • Avoid exposure to overhead avalanche terrain, avalanches may run surprisingly far.
  • Avoid all avalanche terrain during periods of strong wind.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.

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.