Lawinenlagebericht

Jasper

Apr 10 – 11, 2021
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Archiviert · abgelaufen 5 years ago

Lawinengefahr

Mon
Tue
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering

Kernpunkte

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.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    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

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    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

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    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

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