Bulletin d’avalanche

Jasper

Feb 23 – 24, 2016Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

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

Intense solar radiation will raise localized hazard ratings on south aspects. Heads up on these aspects late in the day.

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.

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 triggering the basil weakness in the snowpack. All observations are thought to be 3 to 4 days old or older. Occurring mostly in features where there is obvious loading and in steeper gullies from the Alpine.

Confidence

Timing or intensity of solar radiation is uncertain

Régions couvertes