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Avalanche Forecast

Archived

Dec 2nd, 2019–Dec 3rd, 2019

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.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Lizard-Flathead.

Caution as you transition into wind exposed terrain. Avalanches are possible in alpine terrain where wind slabs have formed.

Confidence

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

Weather Forecast

The notable feature in the weather forecast for the next few days is very high winds at upper elevations.

MONDAY NIGHT - Mainly cloudy with isolated flurries / southwest winds, 30-60 km/h / alpine low temperature near -7

TUESDAY - Mainly cloudy with isolated flurries / southwest winds 40-80 km/h / alpine high temperature near -4

WEDNESDAY - Mainly cloudy with flurries, 5 cm / southwest winds, 30-70 km/h / alpine high temperature near -3

THURSDAY - Cloudy with sunny periods / southwest winds, 20-30 km/h / alpine high temperature near -2

Avalanche Summary

There have been no recent avalanches reported in the region. If you are getting out into the mountains, let us know what you see by posting to the Mountain Information Network!

Snowpack Summary

Approximately 10 cm of new snow sits on a mix of sugary faceted snow, and hard wind affected snow. The new snow is likely being formed into wind slabs by strong westerly winds. The total snowpack depth is between 50-100 cm in the alpine, and tapers rapidly at lower elevations. Two crusts have been reported in the middle of the snowpack. There is uncertainty as to how well the snow is bonding to these crusts.

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.