Bollettino valanghe

Banff Yoho Kootenay

Jan 15 – 16, 2025Avalanche Canada
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Archiviato · scaduto 2 years ago

Pericolo valanghe

Fri
Sat
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole

In sintesi

High elevation winds have been strong to extreme for the last week, so be on the lookout for windslabs if venturing into high, windy spots.

Deep slabs haven't been observed in days, but a weak snowpack persists in shallow areas - ski the thick, avoid the thin.

Problemi valanghivi

  • Wind Slabs

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

    Recent snow and extreme NW to SW wind have developed small slabs in high alpine terrain that is exposed to the wind. These may run further than expected if they pick up facetted snow in steep gullied terrain.

  • Deep Persistent Slabs

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

    Weak facets exist at the base of the snowpack. Although we haven't seen much avalanche activity on this layer in a while, the snowpack structure is weak and large open slopes at treeline and in the alpine remain suspect.

Confidence

Moderate

Avalanche Summary

No avalanches were observed or reported on Jan 14

Snowpack Summary

Over the past week, ~10cm has accumulated, accompanied by strong to extreme west winds that have formed slabs in exposed high alpine areas. The recent snow rests on a layer of facets and surface hoar, although we haven't seen many avalanches sliding on this layer yet. The middle and bottom of the snowpack are weak, with depth hoar and facets near the ground. An average of 60-100cm of snow can be found at treeline elevations.

Weather Summary

Strong westerly winds at ridgetop with warm temperatures in eastern areas will dominate on Wednesday. This will be accompanied by variable cloud cover and trace snow accumulations.

Thursday, we expect extreme SW winds accompanied by up to 5 cm new snow.

On Friday, we will see cooling temperatures and easing winds as arctic air moves in for the weekend.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.

Regioni coperte