Avalanche Forecast

Issued: Nov 30th, 2017 4:16PM

The alpine rating is considerable, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs.

jfloyer, Avalanche Canada

Sea To Sky.

Successive moderate storms will keep danger elevated, particularly in steep, wind-affected terrain. If the 24 hour snow amounts exceed 25 cm, bump avalanche danger up by one rating.

Summary

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

Friday: 10-15 cm new snow with freezing levels around 1000 m. Strong southwesterly winds.Saturday: 10-15 cm new snow with freezing levels around 900 m. Moderate southerly winds.Sunday: Dry with some sunny breaks. Light northwesterly winds.

Avalanche Summary

Ski cutting produced soft slab avalanches up to size 1.5 in recent storm snow at treeline and alpine elevations on Tuesday and Wednesday. Similar activity is anticipated for Friday.

Snowpack Summary

Approximately 40-50 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 150 cm in sheltered treeline locations, although deeper (and shallower) spots certainly exist on account of the strong winds.

Problems

Wind Slabs

Wind slabs are building over a crust layer. This layer may slide easily, particularly on steep convex terrain or where the wind has blown it into more cohesive slabs.

Use ridges or ribs to avoid pockets of wind loaded snow.Avoid steep lee and cross-loaded features

Aspects: North, North East, East, South East, South.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 2

Valid until: Dec 1st, 2017 2:00PM