Bulletin d’avalanche

Jasper

Apr 5 – 6, 2021
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Archivé · expiré 5 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Cornices are waking up in Jasper. Several natural cornices have failed in the Churchhill range in the last 24 hours, most releasing a slab below. Expect the wind to pick up and wind slabs to become more reactive where effected.

Problèmes avalancheux

  • Wind Slabs

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

    New and building wind slabs can be found in lee features near ridge crests, and cross-loaded gullies.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3.5

    Cornices have become active recently. Give these the respect they deserve and give a wide berth when you have to engage them in your travels

  • Loose Wet

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

    Several wet loose avalanches were observed Monday afternoon on solar aspects Tree line and below. Keep this in mind when planning your travel times in these locations.

Weather Forecast

Tuesday:

Cloudy with sunny periods.

Precipitation: Nil.

Alpine temperature: High -3 C.

Ridge wind southwest: 15 km/h gusting to 45 km/h.

Freezing level: 1900 metres.

Wednesday:

Flurries.

Accumulation: 10 cm.

Alpine temperature: Low -7 C, High -4 C.

Ridge wind southwest: 20 km/h gusting to 70 km/h.

Freezing level: 1600 metres.

Snowpack Summary

HST of 10-30cm has settled to about 10cm of snow. Shifting winds forming isolated wind slabs at TL and ALP. The snowpack shows good bonding in field tests in deeper snowpack areas, shallow snowpack regions such as Whistler/Portal and Bald Hills have bigger a potential for weak layers to wake up and are more complex to assess.

Avalanche Summary

Monday morning there was an avalanche incident around Lake Louise. Read Min report here:

Several Size 2-3 slabs were observed in isolated extreme terrain triggered by cornices.

Solar aspects had numerous loose wet slides tree line and below.

Confidence

Régions couvertes