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Avalanche Forecast

Archived

Dec 21st, 2018–Dec 22nd, 2018

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, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Northwest Inland.

After a brief break in the weather, wind and flurries are forecast to continue throughout the weekend. Be aware of the potential to trigger wind slabs, especially in lee terrain at upper elevations.

Confidence

Low - Due to the number of field observations.

Weather Forecast

FRIDAY NIGHT - Cloudy with clear periods and isolated flurries / south winds, 15-35 km/h / alpine low temperature near -10°c. SATURDAY - Cloudy with scattered flurries, up to 5 cm / southeast winds, 15-30 km/h / alpine high temperature near -7°c. SUNDAY - Flurries, 5-10 cm by Monday morning / southeast winds, 35-50 km/h / alpine high temperature near -5°c, low temperature near -8°c. MONDAY - Cloudy with scattered flurries, 1-4 cm / southwest winds, 20-50 km/h / alpine high temperature near -5°c, low temperature near -10°c.

Avalanche Summary

There have been no recent reports of avalanches, however information from this region is limited. Tell us what you see by posting to the Mountain Information Network! (MIN)

Snowpack Summary

50-90 cm of snow has fallen over the past week, likely forming storm slabs and wind slabs throughout the region. Deeper and more sensitive wind deposits are likely to be found at higher elevations. The storm snow may still need more time to form a good bond with the weak layer of surface hoar (feathery crystals) and facets (sugary snow) that formed during the dry spell in early December. Information is very limited about the current strength of this layer. Deeper in the snowpack, there are several crusts including an early season crust with facets near the bottom of the snowpack.

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.