Bulletin d’avalanche

Jasper

Feb 11 – 12, 2023Avalanche Canada
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Archivé · expiré 4 years ago

Danger d’avalanche

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

Points saillants

Natural avalanche activity in this region has been sparse, but the snowpack is inherently weak and untrustworthy. Conservative terrain choices are still strongly recommended.

Problèmes avalancheux

  • Wind Slabs

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

    Wind slabs are present with the recent snow in the alpine and exposed tree line features. Watch for wind slab development on top of the Jan 27th melt freeze crust.

  • Deep Persistent Slabs

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

    The bottom of the snow pack is inherently weak with well developed Facets and Depth Hoar. Avalanches initiating in the upper snowpack are likely to step down to this layer and gain significant mass.

Confidence

Moderate

Avalanche Summary

One large avalanche occurred in the alpine on an east facing slope in the Churchill range on Wednesday.

Don't forget to post avalanche observations to the MIN.

Snowpack Summary

Up to 10cm of new snow over the last few days has been redistributed by strong SW winds, creating wind slabs in the alpine and into exposed tree line. A weak melt freeze crust facet combo down 25cm below 2100m is showing sudden collapse results in snow pit tests. Generally, the bottom of the snowpack is weak facets and depth hoar.

Weather Summary

A short break in the weather on Saturday before precipitation, rising temperatures, and very strong winds arrive on Sunday.

Detailed weather forecasts from Avalanche Canada: https://avalanche.ca/weather/forecast

Terrain and Travel Advice

  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.

Régions couvertes