Bollettino valanghe

Purcells

Nov 28 – 29, 2024Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 2 years ago

Pericolo valanghe

Sat
Sun
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
Apri la mappa completa

In sintesi

Wind slabs and a deep persistent slabs continue to be reactive to rider triggers. Start conservative and watch for signs of instability like cracking or whumpfing.

Problemi valanghivi

  • Wind Slabs

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

    Fresh and reactive wind slabs may exist, especially at ridgeline and in exposed terrain features.

  • Deep Persistent Slabs

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

    Deep persistent slab avalanches have recently failed on weak faceted snow at the base of the snowpack. This problem is most likely found in the alpine and at treeline on smooth slopes.

Confidence

Low

Avalanche Summary

The deep persistent slab was reactive to rider triggers up to size 1 on Tuesday below treeline.

Last weekend, numerous natural and human-triggered persistent slab avalanches (up to size 2.5) were observed near Invermere. These primarily occurred on north through southeast aspects at treeline and above.

Smaller wind slab avalanches could step-down to the basal facets, initiating a larger slab avalanche.

Snowpack Summary

Up to 15 cm of new snow fell over the weekend. In wind-exposed areas cracking and whumping have been reported.

Down 30 to 40 cm sits a layer of surface hoar primarily found on shaded slopes, or on a thin crust on sunny slopes.

A crust exists near the bottom of the snowpack. This crust may have weak, sugary facets above and below it. Large avalanches failed on this layer last weekend.

Snowpack depths are reported to be 50-70 cm at treeline elevation.

Weather Summary

Wednesday Night

Cloudy with isolated flurries. 15 to 35 km/h west ridgetop wind. Treeline temperature -10 °C.

Thursday

Mix of sun and cloud. 10 to 30 km/h west ridgetop wind. Treeline temperature -9 °C.

Friday

Mix of sun and cloud. 15 to 30 km/h west ridgetop wind. Treeline temperature -10 °C.

Saturday

Mix of sun and cloud. 20 to 30 km/h west ridgetop wind. Treeline temperature -10°C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.

Regioni coperte