Bulletin d’avalanche

Jasper

Feb 17 – 18, 2016Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

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

Public reports of new wind slab avalanches at treeline coincide with Visitor Safety field work today which found touchy new windslabs in crossloaded terrain. Use caution as you transition into wind affected areas.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    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

5cm of snow arriving for the Icefields Parkway with freezing levels rising to1800m on Wednesday. Alpine high of -6C tomorrow with flurries and SW winds, 20km/hr gusting to 50km/hr. Another pulse arriving Thursday bringing 5-10cm, high winds and freezing levels to 2000m.

Snowpack Summary

5-10cm of snow in past 72 hours being distributed by mod-strong SW winds. New wind slab forming in areas where snow available for transport. Solar aspects have a breakable crust 10cm thick. Mid-pack consists of buried wind and persistent slab, which lay on a bed of basal facets. Decomposing surface hoar ~40cm down in isolated areas at treeline.

Avalanche Summary

Field team in the Whistler Creek drainage reported isolated large avalanches to size 3 in the alpine from past 72 hours and remotely triggered 2 small avalanches in wind loaded terrain at treeline. These small avalanches are noteworthy because of the remote triggering, the significant propagation and slab thickness that ranged from 20cm to 1m.

Confidence

Régions couvertes