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Avalanche Forecast

Archived

Dec 2nd, 2019–Dec 3rd, 2019

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

Regions

Cariboos.

New snow accompanied with wind will build and develop storms slabs through the day.

Confidence

Moderate - Uncertainty is due to the track & intensity of the incoming weather system.

Weather Forecast

Monday night: Flurries, up to 10 cm by Tuesday morning. Alpine temperature -10 C, southwest wind 35-50 km/hr

Tuesday: Snow and flurries, 10-30 cm accumulating through the day. Alpine temperature -5 C, southwest wind, 30-55 km/hr.

Wednesday: Cloudy with scattered flurries, up to 5 cm accumulation. Alpine temperature -10 C, west wind 20 gusting to 60 km/hr.

Thursday: Mix of sun and cloud and isolated flurries. Alpine temperature -13 C, southwest wind 10-30 km/hr.

Avalanche Summary

The likelihood of triggering storm slab avalanches will increase through the day as new snow accumulates and is impacted by wind.

Snowpack Summary

Snow and flurries have fallen on a faceted upper snowpack and previously wind-affected surfaces. Below the old wind-affected snow, a layer of surface hoar (feathery crystals) may be found in sheltered areas around treeline. In these areas old, stubborn wind slabs may still be reactive where they overly the weak surface hoar on a crust.

A variety of crusts from late October are buried deeper in the snowpack (down 50-100 cm). 

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.