Bollettino valanghe

Banff Yoho Kootenay

Jan 21 – 22, 2019Parks Canada
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Archiviato · scaduto 8 years ago

Pericolo valanghe

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

In sintesi

While natural activity has dropped off, human triggering of a large slab avalanche on the deep persistent layer is a strong possibility. Remain conservative with terrain selection especially in thin snowpack areas.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–1.5
    Southwest winds in the moderate to strong range Saturday created thin, soft slabs in the alpine 10 to 20cm deep.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–3.5
    Weak facets and depth hoar are found just above the ground have an significant 50-140cm thick slab sitting above them. While natural  activity has dropped off,  human triggering is still possible. Be very cautious with thin snowpack areas . 

Weather Forecast

Temperatures will continue to cool through to Tuesday morning to -10C to -15C values at treeline.  A weak system will bring modest amounts of snow beginning Monday night with winds increasing to strong in the alpine Tuesday as temperatures climb back to -5 to -10 values at treeline. Cloud and light snow is forecast to continue through Thursday.

Snowpack Summary

5 to 15 cm of recent snow buried suncrusts and some surface hoar. Moderate to Strong SW winds created small soft winslabs in the alpine Friday and Saturday. Of greatest concern are the weak facets and depth hoar in the lower half of the snowpack. In thin snowpack areas (150cm or less) triggering a slab over this layer is more likely.

Avalanche Summary

Very little natural activity has been observed over that last week. A party in the Emerald Lake area triggered a slab during Saturday's storm in lee alpine terrain. Avalanche Control workers at the ski hills have been working with small soft windslabs for the last two days. We have entered a low likelihood, high consequence period for avalanches.

Confidence

Regioni coperte