Bulletin d’avalanche

Jasper

Jan 17 – 18, 2013Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

Direct solar radiation is not forecast, but should it occur, the avalanche danger will increase rapidly at all elevations.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Slabs have formed on a variety of aspects from moderate to strong winds (with extreme gusts).  This condition is more prevalent with increasing elevation.

  • 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
    Surface instabilities such as loose snow and new windslabs  may step down to ground, which means a small avalanche has the ability to become large very quickly.  This will occur more likely in shallow snowpack areas.

Weather Forecast

Cloudy skies, strong NW winds and mild temperatures with freezing levels around 1400m on Thursday.  No precipitation during the day but maybe up to 8 cm overnight Thursday.

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.  Windslabs have formed on Southwesterly alpine aspects and previous significant snow transport by intense winds.

Avalanche Summary

Basal facet avalanches (both slab and loose) have been observed below treeline today.  Yesterday, numerous size 2 and a few size 3 natural soft and hard slab avalanches were observed in the alpine.  Many of these slides are stepping to ground and running to valley bottom. 

Confidence

Freezing levels are uncertain on Thursday

Régions couvertes