Bollettino valanghe

South Columbia

Mar 28 – 29, 2015Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 12 years ago

Pericolo valanghe

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

In sintesi

A Special Public Avalanche Warning is in effect.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    3–6
    Large and destructive persistent slabs can be triggered by the weight of a person or sled. Stick to conservative terrain.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–3
    New snow and winds are likely to create touchy storm slabs, especially on features in the lee of the wind.

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

On Sunday, expect 5-10 cm snow and moderate to strong SW winds. Snow eases to light amounts on Monday, then the next pulse begins on Monday night, bringing around 5-15 cm snow with moderate to strong SW winds. Freezing levels are between 1800 m and 2200 m, dropping on Tuesday to around 1600 m.

Avalanche Summary

A widespread avalanche cycle ran on Thursday and Friday in response to wet and windy conditions. These were a mix of storm slab, loose wet avalanches and persistent slabs, up to size 3. A few remotely triggered avalanches were also reported.

Snowpack Summary

Strong winds have shifted snow onto lee slopes at high elevations. Rain on Friday soaked the upper snowpack to at least treeline. Two persistent weak layers in the upper metre or so of the snowpack are the main story. They have been keeping conditions spicy. The mid-March layer, around 60 cm down, is most reactive where it exists as a crust. Around 80-100 cm down, the mid-February facet/crust interface has also been reactive with large loads like smaller avalanches stepping down, cornice fall or explosives. Both layers are sensitive to triggering and propagate easily, causing very large avalanches.

Regioni coperte