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Archived

Avalanche Forecast

Mar 22nd, 2020–Mar 23rd, 2020
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
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.

Expect freshly formed wind slabs in the alpine and open tree line features.

Weather Forecast

A Pacific low was tracking North to South from Panhandle pulling a broad ridge behind. This will being generally unsettled weather with some accumulation (up to 8cm) overnight and over the day Monday with moderate to strong afternoon winds and rising freezing levels to 1400m.

More detailed forecast at: Mountain weather forecast

Snowpack Summary

Forecasted snow (up to 5-8cm overnight Sunday) over a supportive melt freeze crust exists on all Solar aspects to Alpine elevation. Scoured from previous winds. Old hard slabs exists in the alpine and open tree line. More confidence in the southern snowpack. Cornices remain an overhead hazard,

Avalanche Summary

No new avalanches observed or reported.

Confidence

Intensity of incoming weather systems is uncertain on Monday

Avalanche Problems

Wind Slabs

As the snow falls, it will be sitting on a variety of surfaces, from Melt freeze crusts to Scoured wind hammered and sastrugi. The bond will depend on the temperatures during the storm.

  • Use caution in lee areas in the alpine and treeline. Recent storm snow has formed wind slabs.
  • Use caution in lee areas. Recent wind loading has created wind slabs.

Aspects: North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Loose Wet

Strong possiblity of rain overnight and into the morning at lower elevation areas below 2000m

  • If triggered the loose wet sluffs may step down to deeper layers resulting in large avalanches.
  • Use extra caution on solar slopes, or if the snow is moist or wet.

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 1.5

Deep Persistent Slabs

This problem will require a large trigger, thin spots, increased loading or rapid day time warming.

  • Be aware of the potential for full depth avalanches due to weak layers at the base of the snowpack.
  • Avoid shallow snowpack areas where triggering is more likely.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3.5