Bulletin d’avalanche

South Columbia

Apr 14 – 15, 2013Avalanche Canada
Voir sur la carte
Archivé · expiré 13 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
Ouvrir la carte complète

Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Recent snowfall has been redistributed by changing winds. Wind slabs exist on a variety of aspects at treeline and above. Wind has also formed very large and potentially unstable cornices.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–6
    A layer of surface hoar is buried about a metre down, mainly on high northerly aspects. A surface avalanche stepping down, cornice fall, or the weight of a person from a thin-spot trigger point could trigger it.

Avalanche Summary

A size 2 skier accidental avalanche was triggered in the north of the region on a west aspect at 2200m. The skier was not caught in the avalanche which failed within the recent storm snow. Elsewhere, Friday night's storm slab was reactive to explosives and skier traffic in wind-affected terrain to size 1.5.

Confidence

Fair - Timing or intensity of solar radiation is uncertain for the entire period

Weather Forecast

A ridge of high pressure is expected to develop throughout the forecast period. A mix of sun and cloud and generally light east/northeast winds are expected each day. Daytime freezing levels are meant to climb gradually from about 1000m on Monday to about 1600m on Wednesday.

Snowpack Summary

Moderate to locally heavy snow accumulations from Friday night have been shifted by southwest, and more recently northeast winds into windslabs which exist at treeline and above.A surface hoar interface is buried within the upper metre or so of the snowpack, mainly on high-elevation northerly aspects. It may be slowly gaining some strength, but these slopes should still be treated with suspicion. On other slopes, recent storm snow overlies a crust. This interface may become particularly reactive on solar aspects as sunnier skies prevail over the next few days. Cornices in the region are very large and potentially destructive. Triggering will become more likely with forecast sunny periods.

Régions couvertes