Avalanche Forecast

Issued: Dec 6th, 2023 4:00PM

The alpine rating is considerable, the treeline rating is considerable, and the below treeline rating is considerable. Known problems include Storm Slabs.

Avalanche Canada IG, Avalanche Canada

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High freezing levels and heavy new snow will keep avalanche hazard elevated. Natural avalanche activity has tapered off but human triggered avalanches are still likely

Summary

Confidence

Moderate

Avalanche Summary

A widespread natural avalanche cycle Tuesday/Wednesday was triggered by heavy snowfall turning to heavy rain at most elevations. Avalanches to size 3.5 were showing very wide propagation across terrain features and running far into the runout zones.

Natural avalanche activity has tapered off but conditions remain prime for human triggered avalanches.

Snowpack Summary

Approximately 50cms of new snow has fallen over the last few days with very warm temperatures. This has created either a crust or moist surface snow. This moist heavy snow sits on top of a large weak layer of surface hoar.

There is ~130cm of snow at tree line, below average for this time of year. Many early-season hazards still exist at or just below the snow surface.

The base of the snowpack consists of weak, sugary facets in most areas.

Weather Summary

Snowfall with moderate winds will continue overnight Wednesday and into Thursday as the remnants of the storm move through.

Tonight: Mainly Cloudy with isolated flurries. Alpine low of -6°C. Winds 20km/hr. Freezing Level 1100m.

Thurs: Snow flurries, with trace snow. Alpine high of -7°C. Winds 15km/hr. Freezing Level 1100m.

Fri: Mainly cloudy with flurries, trace of new snow. Alpine high of -10°C.

Terrain and Travel Advice

  • Be aware of the potential for larger than expected storm slabs due to the presence of buried surface hoar.
  • Avoid areas with overhead hazard.
  • Early season avalanches at any elevation have the potential to be particularly dangerous due to obstacles that are exposed or just below the surface.

Problems

Storm Slabs

An icon showing Storm Slabs

Surface hoar (10-20mm) has now been buried by ~60cm of heavy/wet new snow. Expect this layer to be reactive as additional snow or rain falls and settles it into a cohesive storm slab. This layer will be deeper in wind loaded areas.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Likely

Expected Size

1.5 - 3

Valid until: Dec 7th, 2023 4:00PM