Bollettino valanghe

South Columbia

Jan 12 – 13, 2013Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 14 years ago

Pericolo valanghe

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

In sintesi

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–5
    Wind slabs may be found behind terrain breaks such as ridges and ribs. These could be triggered by the weight of a person or snowmobile.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–5
    Recent storm slabs are slowly settling, but they may still be touchy in areas where surface hoar is buried. This weakness may be triggered from a distance and avalanches could be surprisingly large.

Confidence

Fair - Freezing levels are uncertain for the entire period

Weather Forecast

Sunday: Light N wind. Alpine temperature near -12. No snow.Monday: Moderate NW wind. Alpine temperature near -5. Light snow.Tuesday: Moderate NW wind. Alpine temperature near -3. No snow.

Avalanche Summary

A natural and human-triggered cycle of size 1-3 storm slabs occurred last week. Many were failing on buried surface hoar or facets. Natural activity has decreased, but human-triggering remains a concern.

Snowpack Summary

50-90 cm of recent snow is settling over old snow surfaces including surface hoar (found especially at and below treeline in sheltered areas), a sun crust (on steep S to SW -facing slopes) and facets. The distribution of buried surface hoar is patchy, but where it exists, it may still be touchy. Many operators are cautiously optimistic that it is showing an improved bond. Recent winds have left wind slabs in the lee of terrain breaks such as ridges and ribs at alpine and treeline elevations. In areas sheltered from the wind, fast-moving sluff could throw you off your feet or carry you into a terrain trap. A strong mid-pack overlies a weak facet/crust layer near the base of the snowpack, which is now considered inactive.

Regioni coperte