Bulletin d’avalanche

Jasper

Jan 24 – 25, 2025Avalanche Canada
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Archivé · expiré 2 years ago

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

Better skiing might be found around tree line after a few days of wind, affecting a variety of aspects and elevations.

Be mindful of wind slabs in unexpected places.

Problèmes avalancheux

  • Wind Slabs

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

    Recent winds have built wind slabs in the alpine and treeline. Winds have been variable in direction so watch for reverse loading. Avalanches may step down to the Deep Persistent Layer.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3

    A variety of crusts with facets above and below exist at the bottom of the snowpack. These layers are going to be with us for a long time and pose a low probability, high consequence situation if triggered.

Snowpack Summary

Widespread wind effect in the TL and Alpine regions. Wind slabs sit on a very weak faceted mid pack. At the bottom of the snowpack are the early season crusts, which are often surrounded by large depth hoar. The snowpack is 70-130 cm in depth at treeline. Valley bottom travel is difficult in the weak, loose facets.

Confidence

Moderate

Avalanche Summary

No new avalanches observed during road patrol from Jasper to Saskatchewan Crossing January 22nd.

A couple of wind slabs up to size two were observed on Sunwapta Peak and Nigel Peak on the 19th.

Avalanche control near Parkers on Friday Jan 17th produced slab avalanches up to size 2.5. These avalanches stepped down to the Deep Persistent layer.

Weather Summary

FridaySunny with cloudy periods.

Precipitation: Nil.

Alpine temperature: High -12 °C.

Ridge wind northwest: 15 km/h gusting to 40 km/h.

Saturday

Sunny with cloudy periods.

Precipitation: Nil.

Alpine temperature: Low -12 °C, High -5 °C.

Ridge wind northwest: 10-20 km/h.

Sunday

Sunny with cloudy periods.

Precipitation: Nil.

Alpine temperature: Low -5 °C, High 1 °C.

Ridge wind northwest: 10 km/h.

Terrain and Travel Advice

  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Avoid exposure to overhead avalanche terrain; avalanches may run surprisingly far.

Régions couvertes