Bulletin d’avalanche

Jasper

Feb 18 – 19, 2016Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Pay close attention to terrain selection and signs of instabilities such as shooting cracks and whumffing.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Strong winds have redistributed storm snow and wind slab can be found at all elevations. Caution on cross loaded gullies and lee aspects.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Previously formed slabs now comprise the upper and mid-pack in many locations. Natural and human triggered avalanches are possible.

Weather Forecast

Low pressure in the gulf of Alaska is driving a warm westerly flow over the park. Overnight temps will drop below freezing but will rise to 2,100m tomorrow. Flurries at upper elevations may shed 5cm with moderate SW winds. Temperatures will cool off on Friday and into the weekend.

Snowpack Summary

Moderate SW winds are building a wind slab  at treeline and into the alpine. These slabs may be up to 40cm thick and are weekly bonded to the snowpack below. The mid-pack consists of buried wind and persistent slab with a failure plane down 60cms. In the valley bottom the snowpack is very week and unconsolidated making for tough trail breaking.

Avalanche Summary

Field team in the Whistler Creek drainage reported isolated large avalanches to size 3 in the alpine.  It is possible to trigger slab avalanches from a distance at treeline and above in wind loaded features; as was done on the 16th to size two in the Whister Creek drainage.

Confidence

Timing or intensity of solar radiation is uncertain

Régions couvertes