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Avalanche Forecast

Archived

Dec 2nd, 2019–Dec 3rd, 2019

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

Regions

Northwest Inland.

Storm slabs may be reactive to human triggering, especially in wind loaded areas at upper elevations. Watch for signs of instability such as whumphing, cracking and recent avalanches.

Confidence

Moderate - Uncertainty is due to the limited number of field observations.

Weather Forecast

MONDAY NIGHT - Mainly cloudy with scattered flurries, 5-10 cm / southwest winds, 30-50 km/h / alpine low temperature near -7

TUESDAY - Mainly cloudy with scattered flurries / southwest winds 30-50 km/h / alpine high temperature near -7

WEDNESDAY - Cloudy with sunny periods and isolated flurries / west winds, 20-40 km/h / alpine high temperature near -8

THURSDAY - Cloudy with sunny periods / light southerly winds / alpine high temperature near -6

Avalanche Summary

Storm slabs may be reactive to human triggers, especially in wind affected areas.

There have been no recent reports of avalanches in the region, however, there is very little information available at this time of year. If you get out into the mountains, let us know what you see by submitting to the Mountain Information Network!

Snowpack Summary

5-10 cm of new snow likely sits on a mix of melt-freeze crusts, hard wind slabs, sugary faceted snow, and feathery surface hoar crystals depending on location. Storm slabs may be reactive at alpine and treeline elevations, especially in wind affected areas. Total snowpack depth ranges from 50-100 cm and tapers rapidly 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.