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Avalanche Forecast

Archived

Nov 14th, 2020–Nov 15th, 2020

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

Regions

Glacier.

25 cm in the last 24 hrs and strong Southerly winds will be creating reactive slabs.

Avalanches have the potential to run from higher elevations to below treeline. Keep a heads up!

Weather Forecast

A transient ridge of high pressure today before a frontal system arrives tomorrow

Today: mix of sun and cloud with isolated flurries. Alpine high -10*C. Winds west-20 gusting to 45km/h

Tonight: mainly cloudy with isolated flurries. Low -11*C. Winds south-30km/h

Tomorrow: snow accumulating to 13cm. Freezing level 1200m. Winds SW-45 gusting to 75km/h

Snowpack Summary

Today's storm snow makes a total of 30-50cm over the Nov 5th crust. At treeline the meter plus snowpack consists of a series of crusts with weaker snow surrounding the crusts. The strong Nov 5th crust reaches as high as 2500m, and potentially higher on steep solar aspects.

Avalanche Summary

Moderate to strong S'ly winds are initiating a natural avalanche cycle from alpine features this morning. Yesterday, several small loose dry avalanches were observed off of the north side of Mt. Macdonald.

Confidence

Due to the number of field observations

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.

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.