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Avalanche Forecast

Archived

Dec 20th, 2021–Dec 21st, 2021

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

Regions

Northwest Inland.

 Avoid wind effected terrain. New rider triggerable wind slab will likely develop on Tuesday at all elevations. 

Confidence

Moderate -

Weather Forecast

Monday night: possible temperature inversion with a low of -11 at 1600m. Strong Northwest winds with no new snow expected.

Tuesday: up to 15cm of new snow with strong winds from the Southwest . High of -18 at 1600m.

Wednesday: light Northeast winds with some flurries expected. High of -13 at 1600m.

Thursday: some light flurries ending in the morning. Light North wind and a high of -21 at 1600m.

Avalanche Summary

No new avalanches were reported over the weekend but observations were limited. If you are out in the mountains please consider making a Mountain Information Network report.

Snowpack Summary

Variable wind over the last week means that wind slab could be found on all aspects in exposed terrain.

The december 15 surface hoar layer is just below the surface in sheltered treeline and below treeline features. It is likely not a problem yet.

An early season crust and facets can be found near the base of the snowpack. This layer now appears to have gone dormant through most of the region but could still be reactive in some shallow snowpack areas. 

Snowpack depth at treeline typically ranges from 100-200 cm, with higher values in the western part of the region and tapering to the east. In the far southwest of the region, the height of snow is closer to 300 cm. 

Terrain and Travel

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Fresh wind slabs will likely form throughout the day, diligently watch for changing conditions.

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.