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Avalanche Forecast

Archived

Jan 17th, 2019–Jan 18th, 2019

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

Regions

North Columbia.

Light snowfalls for Friday and more significant accumulations starting late Friday. Avalanche hazard will increasing for the weekend with new snow, strong winds and rising freezing level.

Confidence

Moderate - Forecast snowfall amounts are uncertain on Saturday

Weather Forecast

THURSDAY NIGHT: Mainly cloudy with isolated flurries, snow accumulation up to 5 cm, light to moderate winds from south, alpine temperature -6 C, freezing level at valley bottom.FRIDAY: Mainly cloudy with isolated flurries, snow accumulation up to 5 cm, moderate southwest winds, alpine temperature -5 C, freezing level at 1300 m.SATURDAY: Periods of snow, accumulation ranging from 10 to 15 cm, strong to extreme winds from southwest, alpine temperature -5 C, freezing level at 1300 m.SUNDAY: Mainly cloudy with isolated flurries, snow accumulation up to 5 cm, moderate to strong west winds, alpine temperature -8 C, freezing level at 800 m.

Avalanche Summary

No new avalanche was observed on Tuesday and Wednesday.

Snowpack Summary

Expected snowfalls starting Thursday night will accumulate over a variety of surfaces. Those snowpack surfaces include a sun crust on solar aspects at treeline and above, faceted dry snow on north aspects and surface hoar up to 15-20 mm in sheltered and shaded areas at all elevation. New wind slabs may also form on north and northeast aspects in the alpine on Friday.The middle and lower portions of the snowpack are generally well-settled and strong.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.