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Archived

Avalanche Forecast

Dec 17th, 2021–Dec 18th, 2021
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
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
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Jasper.

Steady inputs of moderate wind and snow continue to build on the existing windslab hazard.

Travel delays expected Sunday for possible avalanche control on the Icefields Parkway. Check AB511 for updates.

Weather Forecast

Tonight: Cloudy with clear periods. Temp: Low -19 °C. Ridge wind SW:10 km/h.

Saturday: Flurries. Accumulation: 10 cm. Temp: High -11 °C. Ridge wind SW:15-30 km/h.

Sunday: A mix of sun and cloud with isolated flurries. Precipitation: Trace. Alpine temperature: Low -17 °C, High -12 °C. Ridge wind light to 25 km/h.

Snowpack Summary

Moderate SW winds and small amounts of new snow over the week have formed sensitive wind slabs in alpine and treeline areas. Mid snowpack has settled with a 2cm crust present (down ~20cm) below the recent storm snow up to 1950m. Another crust near the base of the snowpack continues to promote basal faceting adding to deep persistent slab concerns.

Avalanche Summary

Anticipating possible Avalanche control operations on the Icefields Parkway beginning Sunday morning. Delays of up to 1.5 can be expected between 10:00 and 15:00. Check Alberta road conditions for updates.

Please share your trip report, Ice and/or Riding conditions on Avalanche Canada's, Mountain Information Network!

Confidence

Intensity of incoming weather systems is uncertain on Saturday

Avalanche Problems

Wind Slabs

New snow available for transport with moderate SW winds continue to incrementally build on this hazard. Use caution in lee features and near ridge crests.

  • Watch for stiffer feeling snow. Avoid areas that appear wind loaded.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2

Deep Persistent Slabs

Triggering this layer would be a high consequence event - cautious decisions and thorough investigation is necessary. More likely to trigger this layer in transitions from thin snowpack to deeper loaded pockets or terrain features.

  • Use caution in thin snowpack areas.
  • Use caution on open slopes and convex rolls

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3