Bulletin d’avalanche

Jasper

Feb 24 – 25, 2021
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Archivé · expiré 6 years ago

Danger d’avalanche

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

That warm feeling on your face at the end of the day is the first sign of spring!

The snowpack is feeling that effect too, be aware of overhead hazards that may be triggered by that solar warming. Ice Climbers, beware!

Problèmes avalancheux

  • Wind Slabs

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

    Severe SW winds have stripped, and transported snow from many areas in the alpine and treeline.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2

    Loose dry, spindrift avalanches remain a problem for ice climbers

  • Deep Persistent Slabs

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

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

Weather Forecast

Tonight: Clear periods. Low -18 C.

Wednesday: Cloudy with sunny periods and isolated flurries. Precipitation: Trace. Alpine temperature: High -14 C. Ridge wind southwest: 20-40 km/h.

Thursday: Flurries. Accumulation: 7 cm.  Alpine temperature: Low -13 C, High -9 C. Ridge wind southwest: 25 km/h gusting to 60 km/h.

Snowpack Summary

Moderate to strong ridge top winds from the SW have created wind slabs or hard surface conditions in alpine and tree line features. In sheltered areas the top 30-60cm is faceted snow over a supportive mid-pack where the snowpack is deeper. Thin snowpack areas are weak, un-supportive, and facetted.

Avalanche Summary

Avalanche control on the Icefields Parkway Monday produced results up to size 3 in the Parkers Ridge zone. Late afternoon activity noted, pockets of loose wet, triggered from steep W aspect. Likely the result of isolated sun and 'greenhouse effect', warming in the Wilson zone.

Confidence

Régions couvertes