Bollettino valanghe

Banff Yoho Kootenay

Jan 15 – 16, 2019Parks Canada
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Archiviato · scaduto 8 years ago

Pericolo valanghe

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

In sintesi

Another day of temperature inversions and solar heating will keep slabs sensitive to failure on Tuesday.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    These wind slabs are becoming older and are likely less reactive but should be treated with respect especially while the warm conditions continue. If initiated these slabs could provide enough load to trigger the deeper basal layers.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    2–3.5
    The weak facets and depth hoar  just  above the ground have an significant slab sitting above them . It is difficult to travel with any confidence given this structure. Some large natural avalanches are still occurring and human triggering is likely.

Weather Forecast

Continued warm temperatures and sun are expected Tuesday as the temperature inversion continues .  Winds that have been in the moderate range out of the West are forecast to diminish through to Wednesday.  Cooling is expected on Wednesday increasing cloud. Trace amounts of snow can be expected Thursday.

Snowpack Summary

New solar crusts steep South and West slopes. Extensive wind effect in the alpine, less so at treeline. In thick snowpack areas, the Dec 10th weak layer of facets is now down 100-150cm with a stronger snowpack below. In thin snowpack areas, there is little separation between Dec 10 and the weak depth hoar/ facets sitting 40 cm above the ground.

Avalanche Summary

A size 3 slab failed on the south aspect of Mt Fairview sometime during the last couple days of temperature inversions and clear skies. The crown was 70cm to 1m deep and over 1000m wide. The slide ran up the other side of the valley below Sheol. There were 2 sz 2 loose wet avalanches observed on a field trip to Hamilton Lake at 2400m west aspect.

Confidence

Regioni coperte