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Avalanche Forecast

Archived

Dec 20th, 2018–Dec 21st, 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.

Information from this area is limited, it is critical to supplement this forecast with your own observations. Back off if you see recent avalanches, experience whumphing, or see cracking in the snow.

Confidence

Low - Due to the number of field observations.

Weather Forecast

THURSDAY NIGHT: Cloudy with clear periods, northwest winds, 30-50 km/h, alpine low temperature near -13°c. FRIDAY: Cloudy with sunny periods, west winds, 15-35 km/h, alpine high temperature near -9°c. SATURDAY: Cloudy with sunny periods, southeast winds, 15-30 km/h, alpine high temperature near -7°c,  low temperature near -9°c. SUNDAY: Cloudy with flurries, up to 5cm, southeast winds, 20-40 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

A total of 40-80cm of snow has fallen over the past week, likely forming storm slabs and wind slabs throughout the region. The combination of new snow and strong wind has likely formed thicker and more sensitive wind deposits at higher elevations. The storm snow may still need a bit more time to form a good bond with the weak 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 potential weak 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.