Bollettino valanghe

Banff Yoho Kootenay

Jan 20 – 21, 2023Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 4 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

Good skiing can be found on low-angled terrain above treeline. The snowpack remains generally shallow and weak, a little less so to the West. Do not lose sight of the unpredictable nature of the deep persistent slab problem even though conditions appear to have improved.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–1.5

    It is forecast to be windy on Thursday night, which could blow the 10cm of low-density snow into wind slabs on lee aspects.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–2.5

    The lower snowpack is comprised of weak facets and depth hoar with the upper snowpack forming a 40 to 90cm thick slab above. This weak basal layer is uniform across most of the forecasting region and has been responsible for most of the avalanche activity to date this season.

Confidence

Moderate

Avalanche Summary

A few small surface avalanches triggered by explosives were reported by Lake Louise patrol today. No other avalanches observed or reported.

Snowpack Summary

Dribs and drabs of snow over the past 2 weeks have amounted to 10cm. This sits on a surface hoar /crust layer which is sporadic in the region. The Dec 17 surface hoar/sun crust layer is down 25-50cm, and generally not reactive. The Nov. 16 deep persistent layer is down 40-90cm and continues to produce sudden failures in snowpack tests. In Little Yoho, these two layers are deeper and more spread apart in the snowpack.

Weather Summary

30-50km/h westerly alpine winds overnight into Friday AM, then diminishing to 20-40km/h from the NW. Temperatures will remain at valley bottom with highs of -5C to -10C at ridgetop.

Terrain and Travel Advice

  • Uncertainty is best managed through conservative terrain choices at this time.

Regioni coperte