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Avalanche Forecast

Archived

Dec 6th, 2019–Dec 7th, 2019

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 possible, human triggered probable.
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

Purcells.

Flurries accompanied by moderate southwest wind will continue to develop fresh wind slabs at upper elevations.

Confidence

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

Weather Forecast

Friday Night: Cloudy with flurries, accumulation 5 cm. Alpine temperature -4 C, moderate southwest wind.

Saturday: Scattered flurries, 5-10 cm. Alpine temperature -5, moderate southwest wind .

Sunday: Mix of sun and cloud. Alpine temperature -6, light north wind.

Monday: Cloudy with sunny breaks. Alpine temperature -7, light to moderate northwest wind.

Avalanche Summary

Recent reports indicate explosives triggered a size 2 storm slab avalanches and several size 1-2 wind slab avalanche, mostly on northerly alpine features.

Snowpack Summary

15-30 cm of new snow accumulated in the north through this week with smaller amounts around Panorama and south. The new snow has covered surface hoar in sheltered areas and various wind-affected surfaces elsewhere.

This old, wind-affected snow sits over a crust on solar aspects in the alpine or a surface hoar/crust combination around treeline. The surface hoar is down 25-45 cm and seems to be isolated to the north of the region or areas with a relatively deeper snowpack.

There are a variety of crusts buried 10-110 cm below the surface. These crusts have begun to break down. The base of the snowpack generally consists of facets and depth hoar.