Bulletin d’avalanche

South Rockies

Feb 19 – 20, 2012Avalanche Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    New snow and winds have developed wind slabs on lee and cross-loaded slopes.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    While still fairly shallow and therefore likely to produce mostly smaller avalanches, a weak layer currently buried around 20 cm needs to be closely watched, especially as the region receives more snow.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    3–6
    Deep and destructive persistent slab avalanches are unlikely, but a large trigger may activate this weakness on a steep, rocky & unsupported area with a shallow snowpack.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Monday and Tuesday: flurries both days bringing minimal accumulation of new snow. Light to moderate NW winds increasing to strong NW on Tuesday. Freezing level around 800 m. Tuesday night into Wednesday: a slightly stronger band of moisture arrives bringing around 10 cm new snow, freezing levels rising to 1800 m and strong westerly winds.

Avalanche Summary

No recent avalanches have been reported from this region.

Snowpack Summary

Up to 20 cm of recent snow now sits on a variable weak layer comprising surface hoar (most prevalent in the west of the region), sugary facets on shady northerly aspects and sun crusts on solar aspects. These interfaces need watching as they receive more snow load and/or wind slab builds on top of these surfaces (see the forecaster blog for a good discussion on this). Below that, approximately 20 cm of near-surface facets can be found on shady slopes. While the mid-pack is quite strong in most locations, lingering concern remains for basal facets, particularly in shallower snowpack areas with steep, rocky start zones.

Régions couvertes