Bulletin d’avalanche

Jasper

Feb 24 – 25, 2016Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

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

Heads up in the afternoon on solar aspects- loose wet avalanches are becoming more frequent.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Wind slabs are bonding well, however caution is still warranted in immediate lees and cross loaded terrain above treeline.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Persistent weak layers of decomposed surface hoar, facets, and depth hoar can be found in many locations. Although these layers have been stubborn to trigger underfoot but, will trigger with a heavy load, like cornice failure.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Loose wet avalanches, especially in the later afternoon, are possible on south and westerly aspects.

Weather Forecast

Blue skis and cool temps. Overnight lows near or below -15C. Light to moderate Southwest winds.

Snowpack Summary

15 to 20cms of localized HST in sheltered locations at TL over a supportive mid-pack. This is sitting on a weak basil facet layer. BTL, the HS is more inconsistent in depth and support. Solar aspects have a thin sun crust down 20cms and producing moderate to hard resistant compression test results. 

Avalanche Summary

Activity observed in field trips today seem to be the result of cornice failures and wind loading, triggering the basil weakness in the snowpack. Two new avalanches observed above the Maligne road appear to be solar triggered. 

Confidence

Timing or intensity of solar radiation is uncertain on Thursday

Régions couvertes