Bollettino valanghe

South Coast

Mar 23 – 24, 2015Avalanche Canada
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Archiviato · scaduto 12 years ago

Pericolo valanghe

Wed
Thu
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
Apri la mappa completa

In sintesi

Touchy conditions exist in the North of the region with the potential for large and destructive avalanches.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    2–4
    Easy failures in snowpack tests and large natural avalanches show that a recently buried crust/facet layer commands respect. Touchy conditions are expected to persist for the foreseeable future, especially in the north of the region.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–3
    New snow Monday night may create fresh storm slabs in high elevation terrain. Due to the convective nature of the system, "power flurries" may occur resulting in higher accumulations than anticipated.

Confidence

Fair

Weather Forecast

Monday Night: Convective precipitation amounts are hard to pin down. The region could see 5cm to as much as 15cm above 1000m with very little wind.Tuesday: Scattered convective flurries. Freezing level rising to 1700m in the late afternoon. Light NW winds at all elevations.Wednesday: Winds out of the SW begin to pick up as warm air floods into the region. Look for light SW winds at treeline, potentially strong SW winds at ridgetop. Freezing level should climb to 2000m by late afternoon. 2 to 4mm of rain possible.Thursday: 1 to 5mm of rain. Light SW winds at treeline, strong W/SW winds at ridgetop. Freezing level starting the day at 2000m, climbing to 3000m by the afternoon.

Avalanche Summary

Over the past week, there have been a number of avalanches to size 2.5 occurring on the March 11 persistent weak layer. Some avalanches have occurred naturally, or remotely from distances of up to 100m. Hot spots for avalanche activity seem to include the Duffey Lake area, the Birkenhead drainage, the Hurley and the South Chilcotins. Snow and wind on Monday night will likely add a round of wind slab activity to the mix. But it will also add load to the March layer, potentially adding to its reactivity and destructive potential.

Snowpack Summary

New wind slabs have formed in response to recent wind, snowfall and warm temperatures. At lower elevations, rain has saturated the snowpack. Cornices may also be fragile. A touchy crust/facet persistent weak layer, buried up to 60 cm down, has been reactive producing easy test results at upper treeline and alpine elevations, especially in the north of the region (see avalanche summary). Avalanche problems associated with this layer may linger for a while with the potential for surprisingly large and destructive avalanches. Below this, the snowpack is reported to be generally well-settled and strong.

Regioni coperte