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Avalanche Forecast

Archived

Nov 15th, 2020–Nov 16th, 2020

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 possible, human triggered probable.
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.

Regions

Glacier.

Don't let the variability in storm slab composition catch you off guard!

Carefully assess each feature as you travel today.

Weather Forecast

Westerly flow continues, bringing another series of frontal systems to the region.

Today: flurries accumulating to 6cm. Freezing levels rising to 1100m. Wind SW-40 gusting to 70 km/h

Tonight: mainly cloudy with isolated flurries. Freezing level 900m. Wind SW-35 km/h

Tomorrow: flurries accumulating to 5cm. Freezing level 1200m. Wind SW-25 km/h

Snowpack Summary

Moderate to strong southerly winds have redistributed the 30-60cm that now overlays 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

Notably, a skier accidental with a full burial occurred yesterday up Connaught Creek, where the storm slab was initiated on the November 5th crust. Moderate to strong S'ly winds have also initiated numerous natural avalanches from alpine features on all aspects, large enough to bury, injury or kill a rider.

Confidence

Intensity of incoming weather systems is uncertain

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.