Bollettino valanghe

Sea To Sky

Jan 23 – 24, 2016Avalanche Canada
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Archiviato · scaduto 11 years ago

Pericolo valanghe

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

In sintesi

We should see a couple relatively calm days between storm cycles.

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–3
    Cornices are becoming large and may fail naturally or under the weight of a person or snowmobile. 

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    2–5
    Two layers of buried surface hoar could still be found down 100-150 cm deep. Triggering may still be possible with heavy loads in specific features (slopes near treeline that did not previously slide).

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–4
    Fresh storm slabs have probably settled and strengthened significantly but watch for triggering in steep unsupported terrain, especially exposed wind-loaded slopes. 

Confidence

High

Weather Forecast

Sunday: Cloudy with sunny breaks and a chance of flurries. The freezing level is around 800-1000 m and winds are light from the S-SW. Monday: Cloudy with sunny breaks. The freezing level remains near 1000-1200 m and winds are light from the S-SW. Tuesday: Cloudy with moderate snow/rain. The freezing level rises to 1800-2000 m and winds increase to moderate from the S-SW.

Avalanche Summary

Widespread natural slab and loose wet activity up to size 3 was reported on Friday. Activity was observed on all aspects and at all elevations; however, alpine observations were limited due to poor visibility. Cooling temperatures and drier conditions this weekend will help stabilize the snowpack and reduce the likelihood of triggering slab avalanches.

Snowpack Summary

The "Pineapple Express Light" dumped 80-160 mm of precipitation on the South Coast this week. Most of this fell as snow above 1800-2000 m (over 1 m) with mixed rain and snow or just heavy rain below 1800 m. Heavy snow and strong winds have formed deep and dense wind slabs in exposed lee terrain and caused substantial cornice growth. Expect to find a rain crust at or near the surface (below 10-20 cm of fresh snow) at lower elevations. The early and mid-January surface hoar layers may have been wiped out by the storm and subsequent avalanche cycle. These layers would be down between 100 and 150 cm deep now. Tread cautiously until we know more about the state of these persistent weaknesses. The mid and lower snowpack is generally strong, with the exception of shallower snowpack areas that may be more faceted.

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