Avalanche Forecast

Issued: Jan 1st, 2019 3:08PM

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

Avalanche Canada shorton, Avalanche Canada

Winds switching from southwest to northwest in the past few days created wind slabs on a variety of aspects.

Summary

Confidence

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

Weather Forecast

TUESDAY NIGHT: Cloudy with clear periods, light wind, alpine temperatures drop to -8 C.WEDNESDAY: Cloudy with isolated flurries in the afternoon, light wind, alpine high temperatures around -3 C.THURSDAY: 15-20 cm of snow, moderate wind from the southwest, freezing level climbing to 1300 m, alpine high temperatures around -2 C.FRIDAY: Another 10-20 cm of snow, strong wind from the southwest, freezing level around 1200 m, alpine high temperatures around -4 C.

Avalanche Summary

On Monday, ski cutting produced a few small wind slabs on freshly wind loaded slopes. On the weekend, there were numerous reports thin storm slab avalanches (size 1-1.5) that were 15 cm deep, as well as some larger avalanches (size 2) where thicker wind deposits existed (up to 40 cm deep). These were reported as explosives triggered, naturally triggered, and some skier controlled.

Snowpack Summary

20-30 cm of snow sits on a thin sun crust on southerly aspects and small feathery surface hoar in sheltered areas.Beneath this, 50 to 100 cm of snow sits on a rain crust and a weak layer of feathery surface hoar and sugary facets that formed in early December. Although there has not been a reported avalanche on this layer in over a week, snowpack test results tell us that it is still possible to trigger. The lower snowpack is well-settled.

Problems

Wind Slabs

An icon showing Wind Slabs
Moderate southwest wind during the last storm switching to northwest created wind slabs on a variety of aspects.
Keep an eye out for wind slabs in places you don't always see them due to reverse loading.Be cautious as you transition into wind affected terrain.Use ridges or ribs to avoid pockets of wind loaded snow.

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Jan 2nd, 2019 2:00PM

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