Bulletin d’avalanche

Jasper

Jan 13 – 14, 2024Avalanche Canada
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Archivé · expiré 3 years ago

Danger d’avalanche

Mon
Tue
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

Watch for signs of previous reverse wind loading and dry loose avalanches. Just because it is cold doesn't mean that avalanche can't happen.

Problèmes avalancheux

  • Wind Slabs

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

    Reverse loading from NE winds have likely created wind slab on non-typical SW aspects in the alpine.

  • Loose Dry

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

    The cold temperatures and the clear skies will trigger loose dry avalanches from steep rocky terrain. These avalanches by themselves will be of low risk unless you are in a terrain trap or above a cliff.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–2.5

    You must keep this basal layer on your radar as triggering is possible in isolated features, such as steep rocky terrain where you find yourself standing on the surface and not wallowing in facets, that's the problem slab.

Terrain and Travel Advice

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Loose avalanches may start small but they can grow and push you into dangerous terrain.

Weather Summary

Saturday

Sunny

Precipitation: Nil.

Alpine temperature: High -25 °C.

Light ridge wind.

Freezing level at valley bottom.

Sunday

Sunny with cloudy periods.

Precipitation: Nil.

Alpine temperature: Low -25 °C, High -23 °C.

Light ridge wind.

Freezing level at valley bottom.

The Mountain Weather Forecast is available at Avalanche Canada https://avalanche.ca/weather/forecast

Confidence

Moderate

Avalanche Summary

Loose dry avalanches to size one from steep rocky terrain were observed across Jasper on Thursday.

Snowpack Summary

Cold temperatures continue to weaken the snowpack. There is a possibility of reverse wind loading from previous NE winds in the alpine. Cold temperatures can cause a wind slab problem to persist longer than normal. Old persistent weak layers are present in the snowpack but continue to facet and are unreactive in snow pit tests.

Régions couvertes