Bollettino valanghe

Banff Yoho Kootenay

Mar 12 – 13, 2019Parks Canada
Vedi sulla mappa
Archiviato · scaduto 8 years ago

Pericolo valanghe

Thu
Fri
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
Apri la mappa completa

In sintesi

Avalanche control will occur on Wednesday on Mt. Bosworth, Stephen, Field and Dennis. No skiing or climbing in any of these areas please. Conditions are changing with the new snow, warmer temps and wind. Stay in front of the change - it happens fast.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–2.5
    New snow and strong SW winds have built slabs in open areas above treeline. These slabs are sitting on the weak, faceted snow that was previously on the surface and as a result can run further than expected when triggered.

  • Loose Dry

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2
    Previous cold temperatures created weak, faceted surface snow. In steep terrain, these facets remain easily triggered and can gain enough mass to affect skiers and climbers. Narrow gullies are where this is most concerning.

Weather Forecast

A system crossing the area overnight on Tuesday will deposit another 5-10 cm before it ends mid-day on Wednesday. Temperatures will remain in the -10 range and winds look to be generally light.

Snowpack Summary

Strong SW winds overnight Monday have redistributed recent snow into wind slabs in open areas above treeline. This recent snow sits over weak facets, previous wind effect or sun crusts on steep solar aspects. The mid pack varies from supportive in thicker snowpack areas to weak and completely faceted in thin areas.

Avalanche Summary

No new avalanches observed or reported on Tuesday, but small natural avalanches and spindrift were observed on Monday afternoon. Some of these traveled long distances entraining facets. Several skier triggered slabs have occurred in the last couple days, and avalanche control Sunday produced slabs up to size 2.5 running to treeline.

Confidence

Due to the number of field observations

Regioni coperte