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Avalanche Forecast

Archived

Dec 1st, 2019–Dec 2nd, 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, human triggered possible.
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, and at upper elevations. Watch for signs of instability such as whumphing, cracking and recent avalanches.

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

SUNDAY NIGHT - Mainly cloudy with isolated flurries, up to 5 cm / southwest winds, 40-60 km/h / alpine low temperature near -6

MONDAY - Cloudy with flurries, 5-10 cm / southwest winds, 60-100 km/h / alpine high temperature near -3

TUESDAY -Cloudy with sunny periods and scattered flurries, up to 5 cm / southwest winds, 30-50 km/h / alpine high temperature near -5

WEDNESDAY - A mix of sun and cloud with scattered flurries / light north west winds / alpine high temperature near -7

Avalanche Summary

Storm slabs will may be reactive throughout the region on Monday with new snow and strong winds in the forecast.

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. Continued snowfall and high winds are expected throughout the day, bringing total new snow amounts to approximately 15-20 cm by the end of the day. Storm slabs will likely be reactive. 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.