Bollettino valanghe

South Columbia

Mar 29 – 30, 2013Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 14 years ago

Pericolo valanghe

Sun
Mon
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

The region will be under the influence of a major warm-up through the weekend.  Be aware of snow conditions changing quickly and avalanche danger increasing.

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    2–6
    Natural cornice falls are a concern during daytime warming. Slopes with corniced entrances, or exposed to cornice falls should be avoided with these conditions.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    2–6
    The March 10th weak layer of surface hoar is buried down more than a metre in most places. It may become more stressed with the weekend warm-up. Pockets of wind slab from localized wind, including down-flowing katabatic wind, may be rider triggered.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely
    Dimensione
    1–5
    Warm temperatures and strong solar radiation may cause loose moist or wet snow avalanches. Keep an eye on changing conditions: Avalanche activity, snowballing, moist and wet snow are initial indicators of deterioration and increased hazard.

Avalanche Summary

Solar aspects have been very active showing loads of natural loose wet avalanches and cornice releases up to size 2.5. I expect natural avalanche activity to continue with freezing levels to the moon and sunny skies throughout the forecast period.

Snowpack Summary

Surface faceting and surface hoar growth (up to 20 mm) has been prevalent on shady slopes and at upper elevations, while the surface snow on sun-exposed slopes and at lower elevations has been subject to daily melt-freeze cycles. Cornices are reported to be very large and weakly bonded. Cornice fall has been responsible for triggering some persistent weak layers below and initiating some very large avalanches.The weak layer of buried surface hoar from March 10th is down more than a metre in most places, and is giving variable results in snow profile tests. However, this deep persistent weakness remains a concern and may be triggered by larger loads or hitting the sweet spot in thin, variable snowpack areas. Wind slabs are reported to be strengthening, but may continue to be sensitive to human-triggers.

Confidence

Good

Weather Forecast

The region continues to be under a significant high pressure system with a blocking pattern. This pattern will not allow any active weather throughout the forecast period. Sunny skies with few clouds and unseasonable high freezing levels will continue.Saturday: Few clouds. Alpine temperatures near 5.0 and freezing levels rising to 2400 m. Ridgetop winds will blow light from the West.Sunday: Mostly sunny with possible high cloud. Alpine temperatures 5.0 degrees and freezing levels 2500 m. Ridgetop winds will be light from the NW.Monday: Mix of sun and cloud. Alpine temperatures near 2.0 degrees and freezing levels hover around 2200 m. Ridgetop winds blowing light from the West.

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