Avalanche Forecast
Issued: Dec 18th, 2017 4:18PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs.
istorm,
Avalanche Canada
Impressive snowfall amounts are forecast but avalanche danger will increase to High where more than 30 cm of snow accumulates. Cold weather after the storm should preserve the powder and provide good riding for days to come.
Summary
Confidence
High -
Weather Forecast
The storm track is set up to follow the Canada - USA border for the next few days putting the South Rockies in the bulls eye for precipitation. The region received around 10 to 15 cm overnight (by Monday morning) and the snow will start cranking up again late on Tuesday morning.Tuesday: Cloudy with snow starting to fall in the morning. Heavy snowfall in the afternoon and overnight with highest amounts south of Highway 3. Areas like Corbin, Crowsnest, and Castle Mtn should receive between 30 and 50 cm of snow. Further north around Elkford 15 to 25 cm is more realistic. Light east wind. Alpine temperatures around -10 C or colder.Wednesday: Lingering flurries but not much accumulation. Mix of sun and clouds. Light east wind. Alpine temperatures -15 to -20 C.Thursday: Mix of sun and cloud. Dry. Light west wind. Temperatures around -15 C.
Avalanche Summary
No new avalanche activity reported.
Snowpack Summary
Up to 15 cm of new snow fell by Monday mornining. Isolated pockets of wind slab may be found on easterly aspects in the alpine, while windward slopes have been scoured down to the old rain crust or rock. Sun crusts have formed on southerly slopes. In sheltered terrain at and below treeline very large feathery surface hoar and sugary facets are on the surface. The two crusts that were buried near the end of November can now be found approximately 15 to 20cm below the surface. A third crust from the end of October exists near the base of the snowpack. Recent testing on this crust did not produce significant results.
Problems
Storm Slabs
Touchy storm slabs will develop as new snow accumulates Tuesday afternoon -- especially in the southern half of the region. Consider avoiding avalanche terrain during the height of the storm.
The new snow will require several days to settle and stabilize.Use caution on open slopes and convex rolls at treeline where buried surface hoar may be preserved.Be cautious as you transition into wind affected terrain.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 19th, 2017 2:00PM
