Bollettino valanghe

Sea To Sky

Apr 22 – 23, 2012Avalanche Canada
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Archiviato · scaduto 14 years ago

Pericolo valanghe

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

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–5
    Large cornices are looming. These are a hazard in themselves and could trigger avalanches on the slope below.

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–3
    Wind slabs have developed with recent snow and moderate winds, and more may develop with incoming weather. Be alert for these behind ridges and terrain breaks.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely - Very Likely
    Dimensione
    1–6
    Wet loose or slab avalanches may slide easily on a buried crust, particularly while rainfall or mild temperatures continue. These can gather mass, push you around and become surprisingly large.

Confidence

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

Weather Forecast

Monday: Light rain, with snowfall possible only at very high elevations. Freezing level around 2600 m. Light to moderate south-easterly to south-westerly winds.

Avalanche Summary

Several size 1-2 avalanches were triggered by people and explosives on Friday following overnight snow and wind. These failed on a crust or within recent storm snow layers. Natural avalanches were also triggered by sunshine on solar aspects, and a size 2 natural slab was observed on a NW aspect in Garibaldi Park. On Saturday, similar activity continued.

Snowpack Summary

20 cm of snow which fell on Thursday night was shifted into wind slabs on slopes lee to the south or south-west. Around 50 cm of snow now overlies a buried crust, which has been acting as an easy sliding layer. Solar warming de-stabilized new snow above this crust on Friday and Saturday. Warm temperatures through Saturday night didn't allow the snow surface to refreeze. This pattern is likely to continue for the next few days, which could lead to a weak, wet snowpack at all elevations. A deeper crust layer from late March, buried within the upper 2 m of the snowpack, remains a lingering concern for big avalanches, particularly during times of intense or prolonged snowpack warming. Large cornices threaten slopes. Glide slab releases are a possibility, especially in steep rocky terrain.

Regioni coperte