Avalanche Forecast

Issued: Dec 3rd, 2021 4:00PM

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

Avalanche Canada TRettie, Avalanche Canada

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Wind slabs will remain sensitive to rider traffic, especially at higher elevations.

Summary

Confidence

Moderate - Uncertainty is due to the limited number of field observations.

Weather Forecast

Friday night: low of -10 at 1500m with 5 to 20cm of snow with the higher amounts in the North of the region. Winds in the North will be strong from the West. Winds in the South will be moderate from the Southwest. 

Saturday: light snow, up to 5cm, ending in late afternoon. High of -8 at 1500m. Winds will be Moderate from the Northwest.

Sunday: No new snow expected, temperature at 1500m -16, winds will be Moderate to Strong from the Northwest.

Monday: Some light flurries starting in the late afternoon. High of -14 at 1500m and strong Northwest winds.

Avalanche Summary

A few large avalanches were observed in the Southeast corner of the region. These avalanches ran on a deep persistent layer, likely one of the crusts from late October or early November.

Several size 1-2 wind slabs were reported on North and Northeast aspects. These avalanches likely ran in the recent storm.

Snowpack Summary

Wind slabs will be found in wind exposed terrain in the treeline and alpine. A new crust exists below 1700m. The mid November rain crust can be found down 1m.

The lower snowpack consists of a series of early season crusts. These appear to be strong, but shallow alpine slopes along the eastern side of the Rockies towards Jasper may have weaker, faceted snow near the ground. Avoid thick to thin areas where you are more likely to be able to trigger this deeper instability. 

Snowpack depths are anticipated to be approaching 3 m in the alpine and around 150cm at treeline. Pine Pass area is currently the leader for snowpack depths.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.

Problems

Wind Slabs

An icon showing Wind Slabs

Wind slabs are likely to be found near ridgelines and exposed terrain in the treeline and alpine.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1.5 - 2.5

Valid until: Dec 4th, 2021 4:00PM