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Archived

Avalanche Forecast

Dec 20th, 2019–Dec 21st, 2019
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
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
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Jasper.

Stay out of avalanche terrain as this storm tests our weak snowpack. Weeping wall & polar circus will be closed Saturday and Sunday due to avalanche control on the Icefields Parkway. Emergency road closures are possible depending on storm intensity.

Weather Forecast

Continued precipitation tonight and into tomorrow could see up to 30cm

Saturday: Periods of snow. Accumulation: 16 cm. Alpine temperature: High -3 C. Mostly light ridge wind occasionally gusting to 40 km/h. FL: 1700M

Sunday: A mix of sun and cloud. Precipitation: Nil. Alpine temperature: Low -13 C, High -9 C. Ridge wind light to 15 km/h. FL at VB

Snowpack Summary

10cm new over the last 6 hours, Light winds continue building variable strength wind slabs on lee and crossloaded features at or above treeline. Persistent interfaces layered through the snowpack that might wake as the up to as the 35cm's of new snow forecasted in the next 36 hours accumulates.

Avalanche Summary

No new avalanches observed today with poor visibility and a field trip to Parkers ridge area.

Confidence

Forecast snowfall amounts are uncertain

Avalanche Problems

Storm Slabs

As new snow accumulates, Expect the hazard to increase.

  • Minimize exposure during periods of heavy loading from new snow and wind.
  • 892

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely - Certain

Expected Size: 1 - 2.5

Wind Slabs

Continued S-SW winds are creating wind slabs in NW to SE lee aspects. Sensitivity expected to be reactive in the immediate future and may wake deeper, weaker interfaces.

  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • The recent snow may now be hiding windslabs that were easily visible before the snow fell.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2.5

Deep Persistent Slabs

Triggering the windslab problem has potential to step down to this layer.

  • If triggered the storm/wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3