Avalanche Forecast

Issued: Jan 7th, 2017 5:00PM

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

Avalanche Canada shorton, Avalanche Canada

The incoming storm will form new wind slabs and increase the avalanche danger at higher elevations.

Summary

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

SUNDAY: Flurries starting in the afternoon, moderate southeast winds increasing throughout the day, alpine temperatures around -10.MONDAY: Flurries continuing overnight with 5-15 cm of new snow in the north and 20-30 cm in the south, moderate south west winds with strong gusts, alpine temperatures around -5.TUESDAY: Cloudy with scattered flurries and 5-10 cm of new snow, light winds, alpine temperatures around -12.

Avalanche Summary

No new avalanches were reported on Saturday, but be on the lookout for isolated wind-loaded pockets where wind slabs may still be lingering. Expect avalanche activity to increase with the incoming storm.

Snowpack Summary

Up to 5 cm of new snow covers a variable surface with a mix of soft wind slabs, hard wind slabs, sastrugi, faceted snow, sun crust, and even some surface hoar. Last week's winds were primarily from the north, which reverse loaded many terrain features and formed stubborn wind slabs. For low snow areas, such as the northern part of the region, two layers of concern exist. One is a weak layer of snow from mid-December buried approximately 50 cm deep and other is an old rain crust from November buried 80-120 cm deep. Snowpack tests indicate these layers may be possible to trigger in shallow snowpack areas. Elsewhere, these layers are typically much deeper and are considered to be stable.

Problems

Wind Slabs

An icon showing Wind Slabs
The incoming storm will bury old stubborn wind slabs from last week's outflow winds, and form new wind slabs in the lee of exposed terrain.
Choose well supported terrain and avoid convexities.Watch for areas of hard wind slab in steep alpine features.Carefully evaluate steep lines for wind slabs.

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Jan 8th, 2017 2:00PM

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