Bollettino valanghe

South Columbia

Nov 28, 2016Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 10 years ago

Pericolo valanghe

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

In sintesi

Recent snowfall and wind have heightened avalanche danger in the region. Make conservative decisions and wait for the snowpack to stabilize.

Problemi valanghivi

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    2–3
    A heavy snowfall on Saturday has increased the destructive potential and likelihood of triggering storm slab avalanches, especially in exposed lee terrain. Fresh load on the snowpack has also increased the potential to trigger deeper instabilities.

Confidence

Moderate -

Weather Forecast

Up to another 5cm of new snow is forecast to fall in the South Columbia mountains by Sunday evening as light winds shift to the west. Freezing levels will begin a downward trend on Monday. Only trace amounts of new snow are expected for Monday while Tuesday will see cloud cover decreasing and winds shifting to the northwest.

Avalanche Summary

Stormy weather prevented observations at alpine elevations, but new snow was observed sluffing up to size 1 at treeline and below on Saturday, in addition to skier triggered size 1 and natural size 2+ avalanches reported in Rogers Pass on Saturday. Explosives control in the Revelstoke area on Friday also yielded numerous size 2 results with slab thickness reaching up to 80cm in depth. Danger from storm slab avalanche activity is expected to persist while new snow undergoes settlement.

Snowpack Summary

Up to 25 cm of new snow fell on Saturday under moderate to strong southerly winds. This new snow now covers the already touchy storm slabs that existed in exposed areas at treeline and above. On solar aspects these slabs have been reactive above a sun/temperature crust which formed on November 22 and can be found 30-50cm deep in the snowpack. The thick, widespread November 13 crust now lies up to a metre below the surface. Below this crust the mid and lower snowpack are well consolidated, with moist snow present at treeline and below. Isothermal snow can be found at the base of the snowpack.

Regioni coperte