Bollettino valanghe

South Columbia

Jan 20 – 21, 2016Avalanche Canada
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Archiviato · scaduto 11 years ago

Pericolo valanghe

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

In sintesi

Touchy persistent slab + new snow + rising temps + strong winds = a good recipe for avalanches.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely - Very Likely
    Dimensione
    1–5
    A volatile persistent slab has been failing with light loads. These slabs will probably get bigger and more reactive with the incoming storm.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–3
    New snow, rising temps and strong southerly winds are expected to create a storm slab problem. Storm slabs/ wind slabs may pick up a surprising amount of mass.

Confidence

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

Weather Forecast

A Pacific front embedded in a southerly flow brings snow (20-40 cm total), strong S to SW winds and freezing levels rising to around 1500 m on Thursday and Friday. Precipitation and winds ease and temperatures drop on Saturday.For more details check out https://avalanche.ca/weather.

Avalanche Summary

Avalanche activity has been widespread over the last few days as recent snow has reached a critical load above a volatile weak layer. Human and naturally-triggered avalanches have been most prevalent below treeline, but have also occurred at higher elevations in some parts of the region. These have mostly been in the size 1-2 range, with many triggered remotely from a distance. Wind slabs have also been reported in wind-exposed terrain.

Snowpack Summary

A 40-80 cm persistent slab overlies a variety of surfaces including large surface hoar, sun crusts, and facets. This slab is ripe for human triggers and is especially touchy below treeline. Recently formed wind slabs also exist on lee features at alpine and treeline elevations. Incoming snow, with warming and strong winds, will increase the size and likelihood of the persistent slab problem, as well as adding new storm slab problems. The mid and lower snowpack are generally well settled and strong.

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