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Archived

Avalanche Forecast

Nov 30th, 2020–Dec 1st, 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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Jasper.

A weak temperature inversion is forecasted for Tuesday so watch for solar triggered avalanches around rocky terrain. 

Weather Forecast

Parker Ridge Area

Tuesday: Sunny, alpine temperature: High 1 °C. Ridge wind northwest: 10 km/h. Freezing level: 1400 metres. Weak temperature inversion.

Wednesday: Sunny with cloudy periods. Precipitation: Nil.  Alpine temperature: Low 2 °C, High 6 °C. Light ridge wind. Freezing level: 3500 metres.

Snowpack Summary

Extreme winds have stripped the snow from windward slopes in the alpine. Soft snow can still be found in specific sheltered locations at tree line and below. Snow depth at the Bald Hills at tree line is around 80cm with the Nov 4 crust down 50cm and breaking down. The snowpack is supportive to skis. There may be a thin temperature crust below 1700m 

Avalanche Summary

Reports of isolated large avalanches failing near the ground have been reported in the region over the last 72hrs.  On Saturday explosive control at Parkers slabs resulted in two size 2.5 avalanches from the wind loaded storm snow. A few other thin slabs were noted in steep alpine terrain.

Confidence

Freezing levels are uncertain on Wednesday

Avalanche Problems

Wind Slabs

Continuing strong SW winds in the alpine is scouring windward slopes. Be cautious of local wind influences where reverse or cross loading may have occurred.

  • Watch for Wind Slabs low on slopes, and in usually sheltered terrain, due to previous extreme winds.
  • If triggered the wind slabs may step down to deeper layers resulting in larger avalanches.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

The Nov. 4 is down about 50cm at tree line (2000m) and breaking down. Be careful around "thin to thick" areas where deep slabs could be triggered.

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

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3