Bulletin d’avalanche

Jasper

Feb 11 – 12, 2018Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Mon
Tue
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

http://www.pc.gc.ca/apps/scond/cond_e.asp?oid=30728&opark=100092Large natural avalanches continue to be observed out of solar alpine start zones late in the day. The most significant slide covered the road near the Weeping Wall (Mt Cirrus) on Saturday.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2.5
    Up to 45cm of HST fell through the forecast area, over-loading the already weak persistent slab and running far and fast.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–3.5
    Persistent slabs remain a problem. The main concern is for areas exposed to large triggers such as cornices and large South facing alpine terrain exposed to afternoon sun.

Avalanche Summary

Widespread avalanche cycle throughout the forecasted region with numerous to size 3.5 over the last 3 days from all aspects. All elevations saw significant propagation with debris often reaching valley bottom even from ALP start zones. Several large natural avalanches were observed off Mt Cirrus late in the day on Friday.

Confidence

Weather Forecast

Temperatures remaining cool, but have the potential to reach fluctuate significantly over the course of the day. Minimal snowfall expected, light winds, and clear skies to continue through to midweek.

Snowpack Summary

Varied storm snow amts: 10-15cm in the Icefields, 40cm near Mt Wilson, and 30cm north of Beauty creek is sitting on the weak and facetted persistent slab at mid snowpack. Reverse loading from a northerly flow has cross-loaded Alpine features.

Régions couvertes