Bulletin d’avalanche

Banff Yoho Kootenay

May 3 – 4, 2019Parks Canada
Voir sur la carte
Archivé · expiré 7 years ago

Danger d’avalanche

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

Points saillants

Localized snow amount may very at higher elevations. Deeper areas could develop larger then expected wind slabs.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2

    Continued precipitation and moderate winds have formed small pockets of wind slab in immediate lee features at higher elevations. Though in many areas these slabs will be small, localized areas of heaver accumulations may have formed larger slabs.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2.5

    Though not widespread, where this layer does exist ,expect it to be most reactive in areas where a slab sits over previously formed crusts.  On Tuesday we observed several large skier triggered and natural avalanches fail on this layer.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–1.5

    If the sun comes out for any length of time expect loose wet avalanches out of steep sun exposed terrain.

Weather Forecast

Mixed sun and cloud with isolated convective flurries or rain at lower elevations is forecasted through the weekend with light to moderate SW wind. 

Snowpack Summary

5 to 30 cm of new snow and recent winds have created soft slabs in immediate lees in the alpine. Moist snow observed on solar aspects, but alpine north aspects are staying dry. Concern still exists for a facet layer down 30-50 cm which is producing clean shears with snow-pit tests and has been reactive to skier triggering.

Avalanche Summary

Small wet loose avalanches have been observed on solar aspects. Tuesday our field team observed several natural and skier triggered avalanches in the Observation Peak area. These avalanches were triggered on the persistent problem down 40 cm.

Confidence

Régions couvertes