Bollettino valanghe

Banff Yoho Kootenay

Mar 29 – 30, 2013Parks Canada
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Archiviato · scaduto 14 years ago

Pericolo valanghe

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

In sintesi

The spring cycle is in full effect right now. Danger ratings on solar aspects will increase with daytime warming to considerable/high, so start early and be back at the trail-head before the heat of the day!

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    2–3
    Cornice failures have increased in number as the freezing levels rise. They may trigger an avalanche, or be an avalanche themselves in couloirs.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    2–3
    In shallow snowpack areas, particularly east of the divide, whumphing has subsided. However, recent avalanche activity from cornice falls and warm temperatures shows it is still a layer to be respected, especiallly on solar aspects

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2
    Occurring in the afternoons, activity has been mainly isolated to very steep slopes at tree-line and below. Higher freezing levels this weekend may bring more activity in the alpine.

Weather Forecast

Temperatures will be above normal, with freezing levels hitting 2200m tomorrow and possibly 2700m on Sunday. We may see scattered clouds later in the afternoon, but there shouldn't be any precipitation associated with them. Winds will be light from the NW.

Snowpack Summary

W of divide. S through W slopes developing variable melt freeze crusts, thickest on steep W aspects.  Powder snow on N aspects. Generally well settled snowpack.E of divide settled wind slabs over basal facets. Supportive travel with variable sun crust up to 2700m.

Avalanche Summary

Natural cornice release off Wapta Peak near Mt Field this morning, good size 2 pulling small slab below and creating a large powder cloud. See photo here. A size 3 slab off a south aspect was noted in the drainage north of Mt Bourgeau. This likely failed on a sun crust, but scrubbed down to ground lower in the runout.

Confidence

The weather pattern is stable

Regioni coperte