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Avalanche Forecast

Archived

Nov 28th, 2017–Nov 29th, 2017

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

Regions

Sea To Sky.

Successive storms will result in elevated danger, particularly in exposed, windy locations. There's a chance it may start to snow heavily a little earlier than expected on Wednesday. If so, adjust your objectives accordingly.

Confidence

Moderate - Timing of incoming weather systems is uncertain

Weather Forecast

A series of storms is expected to bring further snow and wind to this region.Wednesday: Light snow during the day, getting heavier in the afternoon. Expect around 5 cm new snow during the day, then another 15-20 cm on Wednesday night. Freezing levels around 1100 m. Moderate westerly winds, becoming strong southwesterly later on.Thursday: 5 cm or so new snow. Freezing levels around 1000 m. Moderate southwesterly winds.Friday: 10-15 cm new snow. Freezing levels around 900 m. Strong southwesterly winds.

Avalanche Summary

Natural avalanches were reported up to size 2.5 on Sunday. Activity diminished on Monday following a drying and cooling trend, but is likely to pick up again, especially in steep, wind affected terrain for Tuesday.

Snowpack Summary

Approximately 20-30 cm new snow now sits on top of a rain crust (or multiple crusts) that formed during the recent wet weather. Strong winds have blown snow around in exposed areas creating drifts and scoured areas. Snowpack depths are typically around 140 cm in sheltered treeline locations, although deeper (and shallower) spots certainly exist on account of the strong winds.

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.