Bollettino valanghe

Banff Yoho Kootenay

Dec 31, 2018 – Jan 1, 2019Parks Canada
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Archiviato · scaduto 8 years ago

Pericolo valanghe

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

In sintesi

A significant storm Saturday has left fresh new windslabs and produced an avalanche cycle. Natural avalanche activity seems to have tapered off with light winds and cold temps but human triggering will remain a concern.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2.5
    Strong SW winds blew mid-storm on Saturday creating touchy new slabs. While the cold temperatures that have followed can be expected to diminish the sensitivity of these slabs, they certainly deserve some respect for the next little while.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–3
    A stiff slab overlying a  weak lower snowpack comprised of facets and depth hoar can be found in most areas of the region (generally central and eastern) where  a shallow snowpack exists. Give this weak snowpack some time to adjust to the storm load.

Weather Forecast

As ridge forms, light North winds are bringing cold, dry air to the region through the first few days of the week.

Snowpack Summary

15- 30 cm of snow quickly formed windslabs as it arrived with Strong SW winds Saturday. Below this, through most of the region, a 40-60cm stiff slab sits on a weak base of facets and depth hoar. Deeper snowpack areas display stronger base layers , but have a 60-80cm slab over top of the Dec10 surface hoar/facet layer that remains of concern.

Avalanche Summary

A road patrol in Kootenay today found limited evidence of a mid-storm cycle to sz 2.5 in steep treeline terrain. Saturday,  avalanches from Mt Fairview hit Lake Louise and  Surprise Pass ran. Lake Louise Ski area reported a sz 3 slab on Unity Peak 450m wide, and size 2 slabs in both Semicircular Bowl and Redoubt Bowl running mid-storm Saturday.

Confidence

Due to the number of field observations

Regioni coperte