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Archived

Avalanche Forecast

Dec 8th, 2021–Dec 9th, 2021
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Jasper.

Variable snowfall amounts over the past 24hrs and strong SW winds are cross loading features and creating new wind slabs on northerly aspects tree line and above.

Weather Forecast

Thursday: Isolated flurries. Accumulation: Trace. Alpine temperature: Low -16 C, High -13 C. Ridge wind W: 20 km/h gust to 50

Friday: Scattered flurries. Precipitation: 5cm. Alpine temperature: Low -15 C, High -12 C. Ridge wind SW: 25-45 km/h

Saturday: Snow: Accumulation: 22cm. Alpine temperature: Low -14 C, High -9 C. Ridge wind SW 20 km/h gust 60

Snowpack Summary

Trace to 10cm new snow from passing squalls being redistributed by moderate to strong SW winds; exposed alpine features continue to be scoured. In sheltered areas 20-40cm settled storm snow sits atop a supportive midpack. Our basal crust/facet/depth hoar combo near the ground remains a layer of concern. Snowpack depth 100-140cm Icefields area.

Avalanche Summary

No new avalanches have been reported. Although natural avalanche activity has tapered off, human triggering of large avalanches remains possible especially in features with variable thin to thick snow depths in the alpine and at treeline.  Snowpack tests on Monday produced moderate sudden results on our November deep persistent layer.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Wind Slabs

Variable amounts of new snow and strong SW winds creating new windslab in lee and crossloaded features. Watch for hollow sounds and cracking. Consider testing smaller slopes before committing to larger features; windslabs could initiate deep layers.

  • Use conservative route selection, choose moderate angled and supported terrain with low consequence.
  • Use caution in lee areas. Recent wind loading have created wind slabs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1.5 - 2.5

Deep Persistent Slabs

Natural activity is decreasing however triggering this layer would be a high consequence event - cautious decisions and thorough investigation is necessary.

  • Use caution on open slopes and convex rolls
  • Avoid thin rocky or unsupported terrain features.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3.5