Bollettino valanghe

Kootenay Boundary

Mar 15 – 16, 2025Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 2 years ago

Pericolo valanghe

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

In sintesi

Danger will be HIGH in areas that receive 25 cm or more of new snow. 

Avoid avalanche terrain during periods of rapid loading from new snow and wind.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–3

    Several persistent weak layers exist in the upper meter of the snowpack. The greatest concern for triggering these layers lies in areas where a thick, supportive crust is absent under the new snow.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely - Very Likely
    Dimensione
    1–2.5

    Fresh storm slabs are building, they will get more reactive as more snow accumulates through the day. Slabs will be especially touchy on wind-loaded northerly through easterly slopes near ridgetops.

Confidence

Moderate

Avalanche Summary

A widespread region-wide avalanche cycle of natural and human-triggered avalanches occurred over the last few days, with slabs up to size 3 (very large). These avalanches occurred on all aspects and elevations. The majority were storm slabs but a significant amount failed on persistent layers as well.

Looking forward: Avalanche activity is expected to continue through Sunday.

Snowpack Summary

25 to 40 cm of recent snow previously formed widespread storm slabs. An additional 10 to 20 cm is forecast to fall overnight and through Sunday. Southwesterly winds will be building especially reactive slabs on lee north through east facing slopes near ridgetops.There is potential for the new snow to overload deeper persistent layers in the upper to mid snowpack, causing storm slabs to step down. These layers include:

  • Facets/surface hoar/crust from early March buried 25-50 cm.

  • Facets/surface hoar/crust from mid-February buried 40-90 cm

  • Facets/surface hoar/crust from late January buried 80-120 cm.

The rest of the snowpack is well settled with no other layers of concern.

Weather Summary

Saturday Night

Cloudy with 2 to 10 cm of snow. 35 to 45 km/h south ridgetop wind. Treeline temperature -8 °C.

Sunday

Cloudy with 5 to 10 cm of snow. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Monday

A mix of sun and cloud. 15 to 25 km/h west ridgetop wind. Treeline temperature -5 °C.

Tuesday

A mix of sun and cloud. 15 to 30 km/h northwest ridgetop wind. Treeline temperature -5 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid avalanche terrain during periods of heavy snowfall.
  • As the storm slab problem worsens, the easy solution is to choose more conservative terrain.
  • Be aware of the potential for human triggerable storm slabs at lower elevations, even on small features.
  • Remote triggering is a concern; avoid terrain where triggering overhead slopes is possible.

Regioni coperte