Bulletin d’avalanche

Jasper

Jan 18 – 19, 2013Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

Intense solar radiation or precipitation in the form of rain will rapidly increase the avalanche hazard at lower elevations.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Hard and soft slabs continue to build on a variety of aspects from moderate to strong winds.  Natural slab avalanches have initiated on the surface hoar layer and then stepped down to either the basal facets or the November rain crust.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Wind and warming temperatures are triggering point releases, most commonly out of steep and rocky terrain.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2–3
    Wind slabs and loose snow avalanches have triggered this weakness.  These avalanches have gained significant mass as a result. This situation will more likely occur in shallow snowpack areas.

Weather Forecast

Temperatures will remain mild and skies will be broken on Friday.  Winds will be moderate NW easing to light late in the day.  Precipitation amounts vary from a trace in Jasper Townsite to a possible 10 cm in the Icefields area.

Snowpack Summary

Snowpack remains thin and facetted at lower elevations, but is supportive above tree line. Last week's storm snow has buried a surface hoar layer (Jan6) down approx 30cm.  A variety of wind slabs are building on lee alpine, tree line and on open slopes below tree line from moderate to strong southwesterly winds.

Avalanche Summary

Natural slab activity to size 2.5 was observed at treeline and alpine elevations where the new wind slabs released on the January 6th surface hoar layer.  Although they did not travel far, they did step down to the basal facets and November rain crust layers. 

Confidence

Forecast snowfall amounts are uncertain on Friday

Régions couvertes