Bulletin d’avalanche

Jasper

Feb 20 – 21, 2019Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

Manage your exposure and keep wary to evidence of localized instability such as cracking, whumphing and, recent avalanche activity.

Problèmes avalancheux

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Sun may act as a trigger to initiate the loose unconsolidated surface snow particularly in steep rocky terrain. Definitely a problem ice climbers should keep on radar where small slides can gain mass particularly in terrain traps.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–3
    It is possible to trigger deep slabs in shallow snowpack areas. Terrain management and assessment is critical to a safe day.

Weather Forecast

Wednesday will be mix of sun and clouds with isolated flurries, alpine temperature high -11 C, and West 10-20 km/h winds. Thursday will be sun with clouds, no snow, alpine temperature low -21 C and high -13 C, West 10 km/h winds. A detailed mountain weather forecast is available from Avalanche Canada.

Snowpack Summary

The upper snowpack is faceted creating a weak slab over a instability of surface hoar/facets on a crust down 40cm. The thicker snowpack spots have a strong mid-pack bridging the deep persistent basal weakness of depth hoar. Thinner snow-pack zones are much less consolidated and can act as a slab triggering the basal depth hoar.

Avalanche Summary

Tuesday's patrol was poor visibility but several loose dry avalanches up to size 1 were noted in steep rocky terrain. We could not see into the alpine nor beyond the trees along the roadside. Saturday's field team into Whistler Creek reported no new avalanches.

Confidence

Régions couvertes