Bollettino valanghe

Purcells

Dec 26 – 27, 2014Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 12 years ago

Pericolo valanghe

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

In sintesi

Conservative decision making and disciplined terrain use is the name of the game when these tricky avalanche conditions persist. Check out the new Forecaster Blog @ avalanche.ca.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–4
    A very touchy surface hoar layer is buried by a 40-90 cm thick persistent slab. This layer is widespread, and is easily triggered by skiers and riders. Remote triggering with wide propagation is a concern.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    3–6
    The early November rain crust is buried 1-1.5 m down. It is still possible to trigger an avalanche on this interface, especially from shallow snowpack areas and thin-rocky, unsupported terrain. 

Confidence

Fair - Due to the number of field observations

Weather Forecast

A weak system will slide down the coast and start to affect the Interior on Saturday bringing mostly light snowfall amounts up to 10 cm. Ridgetop winds will be light-moderate from the west, switching to a northerly flow by Sunday. Alpine temperatures will hover around -15 and drop to -20 later Sunday. Conditions will remain cold and dry through Tuesday.

Avalanche Summary

Natural avalanche activity has tapered off, however; on Thursday an explosive triggered size 2.5 slab avalanche initiated in the mid-December surface hoar and stepped down to the early November rain crust. Yikes! Definitely something to keep on your radar.

Snowpack Summary

Storm snow totals 30-70 cm above a very touchy surface hoar layer that was buried mid-December. Below 2100 m this storm slab sits on a thick, solid crust/ surface hoar combo and has been acting as the perfect sliding layer. This persistent slab remains touchy to the weight of a skier and rider, especially in wind effected areas. A hard rain crust with facets from early November is buried over 1 m down and has recently been reactive with larger loads (explosives and smaller avalanches) especially in the Northern part of the region where the snowpack is thinner.

Regioni coperte