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Avalanche Forecast

Archived

Dec 3rd, 2019–Dec 4th, 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.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Cariboos.

New snow and wind! Expect more reactive deposits of storm snow around lee features and cross-loaded terrain.

Confidence

Moderate - Uncertainty is due to how the snowpack will react to the forecast weather.

Weather Forecast

Tuesday night: Snow and flurries, 10-15 cm accumulating overnight. Alpine temperature -10 C, west wind 30-55 km/hr.

Wednesday: Cloudy with scattered flurries, up to 5 cm. Alpine temperature -10 C, west wind 10-25 km/hr.

Thursday: Cloudy with sunny periods. Alpine temperature -13 C, southwest wind 15-30 km/hr.

Friday: Snow, 10-20 cm. Alpine temperature -10 C, southwest wind 10-25 km/hr.

Avalanche Summary

There have been no recent reports of avalanches from this region, however this may be due to a lack of field observations.

Further south, a natural avalanche cycle was observed in Glacier National Park Tuesday. Numerous size 2 storm slab avalanches were observed on all aspects at 2200 m and above. Additionally, 2 size 3 storm slab avalanches were observed on a north aspect at 2165 m and a northwest aspect at 2400 m.

Explosives also triggered a size 3 storm slab avalanche on a north aspect at 2200 m along the Trans-Canada Highway corridor this afternoon. Similar conditions are expected in the Cariboo forecast region.

Snowpack Summary

Snowfall deposited upwards of 25-35 cm of snow around the region. Westerly winds have begun to redistribute new snow into lee features and cross-loaded terrain.

The new snow now covers 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 burried deeper in the snowpack.

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.