Bulletin d’avalanche

Northwest Inland

Apr 10 – 11, 2015Avalanche Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Check out the Northwest Coast bulletin for information on the touchy persistent slab problem, which may also be present in parts of the inland region.If you'd like to share your observations, here, we'd love to have the input !

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Wind slabs on lee slopes are definitely on the radar, with the potential for triggering a wind slab that might step down to the weak March 25th layer.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    The weak March 25th layer is between 45 and 75cm deep. If triggered it could produce large destructive avalanches.

Confidence

Fair - Due to the number and quality of field observations

Weather Forecast

Light snow today, with the freezing level near 1200 m. Winds strong from the South West. SATURDAY: Cloudy with flurries. The freezing level will come down to 500m overnight, and rise to near 1000 m during the day. Forecast winds winds moderate from the SW.SUNDAY: Cloudy with flurries, freezing levels between 500 and 100m, winds moderate to strong from the South WestMONDAY: Much the same as the previous two days, but the freezing level may climb to 1500m during the day.

Avalanche Summary

In the past week, loose wet avalanches to size  2 were reported to have triggered slabs up to size 2.5, possibly releasing on the March 25th surface crust/ surface hoar layer. No reports of avalanches from yesterday, but one commercial operator reports that strong winds are stripping new snow down to the old crust surface and depositing it on lee slopes as windslabs.

Snowpack Summary

Moderate to strong winds are now scouring windward slopes and loading lee features. A crust with surface hoar buried on March 25th is still considered a potential problem in parts of the forecast region and has been most reactive, recently, in the north part of the region.This may come back to life with the new snow and wind loading.  Cornices are now large and may collapse with increased load from the storm.

Régions couvertes