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Avalanche Forecast

Archived

Dec 3rd, 2021–Dec 4th, 2021

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

Regions

South Rockies.

Snow and wind may create small wind slabs in the alpine today. A thick rain crust will sit just below today's new snow. Be prepared for tricky travel conditions if you do venture out today. 

Confidence

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

Weather Forecast

Friday Overnight: Increasing cloud cover in the evening. 1-5 cm of new snow with light southwest winds, increasing to moderate in the early morning. 

Saturday: A cloudy day with 10-15 cm of new snow throughout the day. Strong to extreme ridgetop winds from the southwest. Freezing levels rising to 1300m. 

Sunday: A mix of sun and cloud with trace new snow. Light northwesterly winds and an alpine high of -11 C. 

Monday: A mainly cloudy day with up to 5 cm on new snow. Light northwesterly winds and an alpine high of -11 C. 

Avalanche Summary

No new avalanches have been reported in the past 24 hours.

If you go out in the mountains, please share your observations and/or photos on the Mountain Information Network! ?

Snowpack Summary

New snow from overnight and throughout the day will sit on a thick rain crust on all aspects below 2400m. In the high alpine (above 2400m) new snow overlies a variety of wind-affected surfaces.

Previously, 2 early season crusts could be found in the snowpack below 2300m. It is likely that rain has mainly eliminated these crusts, and amalgamated the snowpack into a thick rain crust with uniform melt forms below. 

Snowpack depths range from 10-80cm at treeline elevations. Higher elevations may hold a deeper snowpack, but will also be more heavily impacted by recent winds. Rain has washed away the snowpack below 1900m. 

Terrain and Travel

  • Fresh wind slabs will likely form throughout the day, diligently watch for changing conditions.
  • Wind slabs may be poorly bonded to the underlying crust.

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.