Bollettino valanghe

Purcells

Mar 20 – 21, 2014Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 13 years ago

Pericolo valanghe

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

In sintesi

Watch the temperature and solar warming! Heat and cornices are two great ways to shake-up the snowpack over the next couple of days

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–3
    Recent accumulations have likely been blown into pockets of wind slab by generally moderate southwest winds. Watch for triggering in gullies, and in the lee of terrain breaks and ridge crests.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    2–4
    There are a number of persistent layers in the mid to upper snowpack which have professional operators concerned. These layers, which include recently buried crusts and surface hoar, continue to be touchy, especially in the north of the region.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    3–5
    The deeply buried early February interface should stay on your radar as activity on this layer would be large and destructive. Possible triggers include cornice fall, thin spot triggering or solar warming.

Confidence

Fair - Timing or intensity of solar radiation is uncertain

Weather Forecast

Friday: 5-10cm of snow with possible sunny breaks / Light to moderate westerly winds / Freezing level at about 1000mSaturday: Flurries with a mix of sun and cloud / Light to moderate northwesterly winds / Freezing level at 600mSunday: Flurries with a mix of sun and cloud / Light southwesterly winds / Freezing level at 700m

Avalanche Summary

We've received reports of size 2.5 and size 3 natural slab avalanches which occurred recently in the Quartz Creek area. The slides occurred on southwest facing alpine terrain with solar warming as a trigger. Sunny breaks over the next few days will likely reactivate weaknesses in the snowpack with the potential for very large avalanches.

Snowpack Summary

Light snow accumulations overlie a well-settled storm slab which formed last weekend. Under the storm slab you'll likely find small surface hoar in shaded terrain and crusts on previously sun-exposed slopes. Recent winds have redistributed surface snow into wind slabs in exposed lee terrain. Rain from the weekend saturated the snowpack at lower elevations and the more recent accumulations may overlie a refrozen crust. Up to 95cm below the surface you may find surface hoar and crusts buried at the beginning of March. This interface is still touchy in some areas, particularly in the north of the region. The deeper facet/crust persistent weakness buried at the beginning of February, now down 60 to 160cm, has been highly variable in terms of reactivity and is still very difficult to trust. Needless to say, any avalanche at these deeper, persistent interfaces would be large and destructive.Weak basal facets exist in many areas, but without a large load, triggering now is unlikely.

Regioni coperte