Bulletin d’avalanche

Banff Yoho Kootenay

Feb 24 – 25, 2013Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

There's variability in danger in the region. Areas immediately along the Divide saw up to 20cm of new snow, locally increasing the danger rating. East of the Divide saw a dusting, thus, a lower danger. If it dumped where you are, keep your eyes open.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Soft slabs in the high alpine are developing with the recent snow and winds. The next system late tomorrow could create further wind slabs. Expect these to be touchy within the next 24 hours.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Cornices can provide the big trigger and entrain new wind slabs and underlying facets. Some of these cornices have been easily triggered in the last week.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Expect sloughing in steep gully terrain. A field team in Kootenay noted large enough sloughs to knock a person around. Ice climbers should monitor this closely.

Weather Forecast

Tomorrow we should see increasing clouds with possibly 5-10cm late in the day. Moderate west winds will accompany this storm. Monday will have unsettled convective cells rolling through, with little in the way of snow for us.

Snowpack Summary

Up to 20cm reported over last 24 hours in the alpine immediately along the Divide. Some thin ridgetop soft wind slab formation in immediate ridge top lees. This snow sits on top of wind slabs, both soft and hard, in alpine areas. Thin snowpack areas at all elevations are very weak and faceted, as are most below treeline areas up to 1900 meters.

Avalanche Summary

Large sloughing was observed off the Stanley Headwall, likely due to strong winds at ridge-top. Experienced climbers in the area said they were large enough to knock climbers off their intended routes. Point releases from steep terrain were observed further south in Kootenay, all in the recent snow.

Confidence

Forecast snowfall amounts are uncertain

Régions couvertes