Avalanche Forecast

Issued: Dec 10th, 2018 3:55PM

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

Avalanche Canada jfloyer, Avalanche Canada

Increase avalanche danger to considerable for windy areas if there is more than 10-15 cm new snow by the end of the day on Tuesday.

Summary

Confidence

Moderate - Forecast snowfall amounts are uncertain on Tuesday

Weather Forecast

Monday Night: 2-5 cm new snow expected overnight.Tuesday: 5-15 cm new snow expected with increasing moderate or strong southwesterly winds. Freezing level around 600 m.Wednesday: Flurries. Moderate westerly winds. Freezing level around 1100 m.Thursday: Light snow, around 5 cm. Strong southwesterly winds. Freezing level rising to around 1400 m.

Avalanche Summary

No new avalanches have been reported.

Snowpack Summary

Increasing southwest winds and light new snow amounts have begun forming new wind slabs on north to east aspects. Beneath the surface, the snowpack is currently quite stable in most places, however a buried weak layer still exists down 20-60 cm. This layer consists of a sun crust on steep south facing slopes, and/or weak surface hoar crystals on more shaded and sheltered slopes. The surface hoar is most prominent at treeline. Although it is slowly healing into the snowpack, it may still react to triggers in areas where surface hoar is sitting on the crust. This combination is most likely found on steep south facing terrain at treeline.At the base of the snowpack is a crust that formed in late October. The probability of triggering this layer is low, but the most suspect areas would be large, steep, rocky alpine features with a shallow snowpack. It would likely take a large trigger such as a cornice fall to produce an avalanche on this layer.Snowpack depths decrease dramatically with elevation.The VARDA gang produced a great video from the Allan Creek zone near Valemount, click here to check it out.

Problems

Wind Slabs

An icon showing Wind Slabs
Strong southwest winds and new snow are expected to form new wind slabs in the alpine and in isolated areas at treeline.
Expect thicker, touchier slabs in the immediate lee of ridgecrests and other wind-exposed features.Watch for newly formed wind slabs on leeward slopes as you transition into wind affected terrain.

Aspects: North, North East, East, North West.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 1.5

Valid until: Dec 11th, 2018 2:00PM

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