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Avalanche Forecast

Archived

Jan 14th, 2021–Jan 15th, 2021

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

Regions

South Coast.

Another splash of rain overnight, followed by dropping freezing levels will make for crusty conditions and low avalanche danger on Friday.

Confidence

Moderate - Uncertainty is due to rapidly fluctuating freezing levels.

Weather Forecast

Thursday night: Rain, 15-20mm, strong southwest wind, freezing levels dropping from 2500 to 1300 m. 

Friday: Cloudy, moderate ridgetop wind, freezing level 1300 m. 

Saturday: Mix of sun and cloud, light to moderate westerly ridgetop wind, freezing level spiking to 2500 m.

Sunday: Snow, 10-20 cm, moderate to strong northwest ridgetop wind, freezing level dropping to 700 m.

Avalanche Summary

No new avalanches reported on Thursday, but glide cracks were observed to be opening up. On Tuesday, numerous wet loose avalanches and small glide avalanches were reported. 

Snowpack Summary

10-20 mm of overnight rain falls on previously rain soaked surfaces at most elevations, and possibly dry snow in the high alpine. As freezing levels drop Friday, a crust will (re)form at elevations above 1300 m.

The mid-pack consists of several buried crusts, and is well-consolidated.

Terrain and Travel

  • A crust on the surface will help bind the snow together, but may make for tough travel conditions.
  • Watch for unstable snow on specific terrain features, especially when the snow is moist or wet.

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.