Bollettino valanghe

South Columbia

Jan 21 – 22, 2016Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 11 years ago

Pericolo valanghe

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

In sintesi

A warm and windy storm is driving danger up on Friday.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely - Very Likely
    Dimensione
    1–5
    Numerous large persistent slabs have been triggered over the last few days. New storm loading will only accentuate this problem.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely - Very Likely
    Dimensione
    1–3
    New snow, rising temps and strong southerly winds are expected to create a storm slab problem. At low elevations, rain on snow may lead to loose wet/ wet slab avalanche activity that could run surprisingly far.

Weather Forecast

Friday brings another 10-20 cm snow, moderate to strong SW winds and freezing levels around 1500 m. A few more cm are expected on Saturday, before a change to light winds, cool temperatures, cloudy skies and a few flurries by Sunday. For more details check out https://avalanche.ca/weather.

Confidence

Moderate - Freezing levels are uncertain

Avalanche Summary

Numerous size 1-2 slabs were triggered naturally and by skiers over the last few days. Many of these failed at and below treeline, on buried surface hoar, about 20-40 cm deep. Many of these were triggered remotely, highlighting the volatility of the persistent slab. An increasing number of wind slabs have also been failing at alpine/ treeline elevations, and also running on surface hoar. Forecast rain at low elevations on Friday may lead to wet loose/ wet slab activity, while higher up the mountain, continued storm slab and persistent slab activity is likely.

Snowpack Summary

New snow, rising temperatures and strong winds are likely to create storm slabs in many places and wind slabs on features lee to the south. This will also add load and stress to the already volatile persistent slab. This 30-60 cm persistent slab overlies a variety of surfaces including large surface hoar, sun crusts, and facets. The persistent slab is ripe for human and natural triggers and is especially touchy at and below treeline. The mid and lower snowpack are generally well settled and strong.

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