Bollettino valanghe

Kootenay Boundary

Jan 4 – 5, 2025Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 2 years ago

Pericolo valanghe

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

In sintesi

Wind slabs are expected to form at upper elevations on Saturday as winds increase and light snow continues.

Choose low-consequence terrain and watch for signs of instability.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    As winds increase, expect new and sensitive wind slabs to begin to form in lee aspect terrain and cross-loaded areas.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1–2.5

    The sensitivity of this problem decreases in the southern boundary of this forecast region. Likely areas for triggering this weak layer are thin spots .

Avalanche Summary

On Friday as winds began transporting light snow, numerous small (size 1 to 1.5) wind slabs where triggered naturally, via ski cut and a few rider triggered. They occurred on all aspects with the exception of east and near the 2000 m elevation.

On Wednesday 2 large (size 2 to 2.5) persistent slab avalanches where rider triggered, both on a north aspect at approximately 2200 m. One was near Nelson, the other Rossland. Review this MIN report link for further details

Confidence

Moderate

Snowpack Summary

10 to 15 cm of light and dry surface snow has been transported by building southerly wind and is expected to be forming windslabs. 30 to 50 cm of settling snow can be found in sheltered areas.

Below this recent snow, a thin crust is present below approximately 1600 m. Above 1600 m a layer of surface hoar is present and reactive to testing and rider traffic.

Weak layers of surface hoar or facets and a crust continue to persist in the mid-snowpack and can be found down between 50 and 120 cm.

The lower snowpack is generally strong and well-bonded.

Review this video on State of the snowpack for further details.

Weather Summary

Friday Night

Cloudy with light snowfall 10 to 15 cm. 25 to 30 km/h east ridgetop wind. Treeline temperature -5 °C.

Saturday

Cloudy with snowfall 5 to 10 cm. 15 to 25 km/h southwest ridgetop wind. Treeline temperature -6 °C.

Sunday

Cloudy with light snowfall 1 to 5 cm, with isolated flurries. 10 to 15 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Monday

Cloudy with snowfall 10 to 15 cm. 15 to 25 km/h southwest ridgetop wind. Treeline temperature -4 °C.

If you head out in the backcountry, let us know what you are seeing by submitting a MIN report!

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Pay attention to the wind; once it starts to blow, sensitive wind slabs are likely to form.
  • Keep in mind that human triggering may persist as natural avalanches taper off.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.

Regioni coperte