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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 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.

Regions

Northwest Coastal.

New snow and wind will mean that storm slabs are to be expected, and will likely be reactive to human triggering, especially in wind loaded areas.

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

MONDAY NIGHT - Flurries, 5-15 cm / southwest winds, 30-60 km/h / alpine low temperature near -5

TUESDAY - Mainly cloudy with scattered flurries, up to 5 cm / southwest winds 30-60 km/h / alpine high temperature near -6

WEDNESDAY - Mainly cloudy with scattered flurries, up to 5 cm / west winds, 20-40 km/h / alpine high temperature near -6

THURSDAY - A mix of sun and cloud / light variable winds / alpine high temperature near -7

Avalanche Summary

It is likely that a natural avalanche cycle occurred throughout the day, and overnight on Monday. 

Natural avalanche activity is expected to taper off somewhat throughout the day on Tuesday, however human triggered avalanches remain likely, especially in wind affected areas.

Snowpack Summary

20-40 cm of new snow is likely sitting on a mix of hard wind slabs, sugary faceted snow, and feathery surface hoar crystals, depending on location. Recent strong winds will have likely formed reactive storm slabs throughout the region. Total snowpack amounts are likely in the 60-120 cm range, tapering quickly at lower elevations.

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.