Bulletin d’avalanche

Jasper

Jan 14 – 15, 2022
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Archivé · expiré 5 years ago

Danger d’avalanche

Sat
Sun
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Slow cooling over the weekend will temper the natural reactivity of the snowpack but, it will remain a serious hazard to riders looking for fresh turns.

Icefields Parkway and Maligne Lake road remain closed for maintenance.

AB511 for up to date info.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2.5

    Wind slab development will continue with light snow and moderate to strong SW wind. Expect wind slabs to be reactive to a riders weight. 

  • Persistent Slabs

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

    A persistent slabs sit over 2 different layers depending on elevation. Below 1950m, the persistent weak layer is the Dec 1 rain crust. Above 1950m, facets buried on Dec 26 are the primary concern.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–1.5

    Watch for overhead pillows or full ledges where loose snow will accumulate.

Weather Forecast

Friday: Mainly cloudy. Temp High -6 °C. Wind SW:15 km/h. FZL to valley bottom

Saturday: Mainly cloudy with isolated flurries. Temps: Low -9 °C, High -6 °C. Wind W: 20 km/h gusting to 50 km/h. FZL to valley bottom

Sunday: Mainly cloudy with scattered flurries. 5 cm. Temp: Low -10 °C, High -7 °C. Wind SW: 15-30 km/h. Freezing level at valley bottom.

Snowpack Summary

New snow with strong SW are creating wind effect and building windslabs on leeward slopes. These windslabs are expected to become more reactive as temperature rises. The mid snowpack remains faceted with the December persistent weak layers buried 40-70cm. Basal facets and depth hoar can be found at the base of snowpack.

Avalanche Summary

Several large windslabs, and loose dry avalanches initiated with explosive control on the Icefields Parkway and Maligne Lake road. Road maintenance ongoing and will take time for both roads to be passable. Downed avalanche patrol though the whole region with varied natural activity noted.

Confidence

Régions couvertes