Bollettino valanghe

Banff Yoho Kootenay

Mar 27 – 28, 2015Parks Canada
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Archiviato · scaduto 12 years ago

Pericolo valanghe

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

In sintesi

The freezing levels should lower tonight and form crusts.  Pay attention to the strength of these crusts at tree line and below this weekend as the wet snow beneath has no strength.  Cornices are weak and fragile on north aspects so keep an eye out.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    There is generally 10-20 cm available for transport and moderate to strong SW wind continues to build windslabs. They are sensitive to human triggering on features such as ridge crests, cross loaded gullies, and steep lee terrain features.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–3
    Rising freezing levels on Friday has the potential to create a loose wet avalanche problem on solar aspects

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    2–3
    The lower half of the snowpack is weak due to the presence of basal facets and depth hoar. This layer has been dormant lately but may become more sensitive with the rising temperatures.

Weather Forecast

The winds will abate as a cold front passes tonight ushering in cooler air and lower freezing levels along with some light precipitation amounts for Saturday morning.  Strong westerly winds at ridgetop will continue mid Saturday through the weekend with scattered precipitation.

Snowpack Summary

Sustained moderate to strong winds aloft continued to build wind slabs and cornices at ridge top today. Moist snow to 2400 meters on polar aspects (North) and moist to ridge top on the solar slopes. Mid pack is well settled and overlies a largely weak basal depth hoar or facets.

Avalanche Summary

Several natural avalanches occurred today up to size 2.5 around the Sunshine Ski Area back country. Many loose wet avalanches with some of them triggering slab avalanches in the lower track below tree line. Suspect with today's warm temps that cornices will be very touchy.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Saturday

Regioni coperte