Bulletin d’avalanche

Jasper

Feb 27 – 28, 2021
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Archivé · expiré 6 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Neighboring regions have issued a special avalanche warning. Our snowpack went through a significant change since the deep freeze in early February. Recent winds, and temperature fluctuations have created a highly complex untrustworthy snowpack.   

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3

    Wind slabs in the alpine and exposed treeline features have the potential for wide propagations across connected features.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–3

    Caution in thin  facetted snowpack areas where triggering is more likely. This is a low probability but high consequence problem.

Weather Forecast

Saturday: A mix of sun and cloud with isolated flurries. High -14 °C. Wind west: 15 km/h gusting to 40 km/h.

Sunday: Cloudy with sunny periods and isolated flurries.  Low -16 °C, High -9 °C. Wind southwest: 20 km/h

Snowpack Summary

Widespread extensive wind effect in the alpine and is highly variable. The lee has windslabs (generally hard) that are well down into the terrain. The windward has been heavily stripped. Treeline and below has wind effect in any exposed terrain. The snowpack below the alpine is faceted with depth hoar near the base and is failing in test results. 

Avalanche Summary

There has been a wind slab avalanche cycle in the last 72 hours from the extreme winds. Most avalanches were size 2 and in the alpine below ridge tops with one size 3 noted that ran down below treeline.

Confidence

Régions couvertes