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Avalanche Forecast

Archived

Dec 10th, 2020–Dec 11th, 2020

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.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

South Coast.

Small storm slabs may be triggerable as ongoing flurries deposit a dusting of new snow over a crust. Travel conditions may be difficult with minimal snow coverage at lower elevations and where the crust is punchy and unsupportive. 

Confidence

Moderate -

Weather Forecast

Thursday night: Flurries up to 10 cm, moderate southeast ridgetop wind, freezing level dropping to 700 m as precipitation starts.

Friday: Flurries up to 5 cm, light variable ridgetop wind, alpine high -2C, freezing level 700 m.

Saturday: Increasing cloud, light to moderate variable ridgetop wind, alpine high +2C, freezing level rising to 1500 m.

Sunday: 10-15 cm new snow, moderate southwest ridgetop wind, alpine high -2C, freezing level rising to 800 m.

Avalanche Summary

There have been no recent avalanche reports in the region.

Have you been out and about in the mountains? If so please submit your observations to the Mountain Information Network (MIN). It doesn't have to be technical - photos are especially helpful! Thank you so much for all the great MINs submitted so far!

Snowpack Summary

The atmospheric river dropped over upwards of 100 mm of rain on the North Shore Mountains early this week. The saturated snowpack continues to cool and freeze into a monolithic block. Ongoing flurries deposit a dusting of new snow overtop of the surface crust.

Snowpack depth changes quickly with elevation. Prior to the rainstorm, depths ranged from 100 cm in the trees up to 150-200 cm near mountain tops.

Terrain and Travel

  • Closely monitor how the new snow is bonding to the crust.
  • Be alert to conditions that change with elevation.
  • A crust on the surface will help bind the snow together, but may make for tough travel conditions.

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.