Avalanche forecast

Jasper

Apr 10 – 11, 2021
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Archived · expired 5 years ago

Avalanche danger

Mon
Tue
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
1 · Low

Highlights

The Icefields region remains winter conditions. 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.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2.5

    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.

  • Cornices

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2.5

    Cornices are large and looming. They are a large trigger on the slope below if they fail or their sheer mass if they hit you would have severe consequences. Potential failures will increase with sun, warmth, or wind.

  • Deep Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    2–3.5

    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.

Weather Forecast

Sunday will be sun, cloud, flurries, trace snow, -9C, light NE winds and valley bottom freezing level. Monday will be similar, -10, light East winds and valley bottom freezing level. Tuesday is sun, clouds, warming up to -3C and 2000m freezing level. There will be a warming trend starting Tuesday.

Snowpack Summary

25cm of new snow arrived Wednesday night at Parkers ridge with much less further North and South. Winds are increasing to moderate speeds forming alpine ridgetop windslabs. 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 PR slope up to size 2.5 likely on Friday. Friday's explosive control work on Parkers slabs produced two size 2.5 hard windslabs burying the road 2m deep. Thursday's Icefield's patrol noted one size 3 on Churchill slide path running full path.

Confidence

The weather pattern is stable on Sunday

Regions covered