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Archived

Avalanche Forecast

Apr 11th, 2021–Apr 12th, 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
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
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.

The Icefields region remains winter conditions for now. Good travel and ski conditions are found in sheltered locations. Be cognisant of traveling through lower elevations where large avalanches from above could travel far.

Weather Forecast

Monday: Cloudy with sunny periods. Precipitation: Nil. Alpine temperature: High -7 °C. Ridge wind east: 10-20 km/h. Freezing level: 1400 metres.Tuesday: Sunny with cloudy periods. Precipitation: Nil. Alpine temperature: Low -12 °C, High -2 °C. Ridge wind light to 20 km/h. Freezing level: 2100 metres.

Snowpack Summary

20-30 cm of new snow arrived since Wednesday night at Parkers ridge with much less further North and South. The midpack is firm snow over weak basal facets and depth hoar near the ground.

Avalanche Summary

Saturday's Icefield patrol observed several cross loaded features avalanche on ALP W facing slopes up to size 2.5 likely from Friday. Friday's explosive control work on Parkers slabs produced two size 2.5 hard windslabs burying the road 2m deep. Deep persistent slabs up to size 3 still occurring within the bulletin region in the alpine.

Confidence

Freezing levels are uncertain on Wednesday

Avalanche Problems

Wind Slabs

There is a lot of snow available for wind transport. Investigate whether this condition rests on a slippery temperature crust having a higher potential for human triggering.

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Use caution in lee and cross-loaded terrain near ridge crests.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5

Deep Persistent Slabs

Forecasters are noting a slight increase in activity in the past few days. One could say the probability is increasing with either natural or human triggering. Shallow snowpack areas would have the increased potential for human triggering.

  • If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
  • Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3.5

Loose Dry

Suspect to be more of an issue in Marmot Basin back country, where snow accumulation has been most significant in the last couple days. Dry loose are less likely to be an issue in the Icefields area.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 1.5