Bulletin d’avalanche

Jasper

Nov 19 – 20, 2020
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Archivé · expiré 6 years ago

Danger d’avalanche

Fri
Sat
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

Expect to find illegal snowmobile tracks in the Parkers Ridge Area. Windslab avalanches have been triggered recently by skiers. Please post to the MIN. https://www.avalanche.ca/mountain-information-network/

Problèmes avalancheux

  • Wind Slabs

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

    New snow and moderate SW winds are forming wind slabs in the Alpine and high Treeline features. A skier triggered wind slab at Parker Ridge on Monday shows that deep wind slabs are still reactive to human loads. See the MIN for more details.

  • Loose Dry

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

    Cool temps, winds and recent snowfall promoting loose dry avalanches in steep terrain.

Weather Forecast

Overnight: Flurries. 8 cm. -9. Light W wind.

Thursday: Cloudy with sunny periods and isolated flurries. High -7. Wind W: 15 km/h gusting to 40 km/h.

Friday: Flurries. 7 cm. Low -13, High -9. Wind SW: 20 km/h gusting to 50 km/h.

Saturday: Cloudy with sunny periods and isolated flurries. Low -12, High -10. Wind W: 15 km/h gusting to 50 km/h.

Snowpack Summary

Yesterdays rain up to treeline have formed a new surface crust. Up to 15cm of new snow brings the snowpack to 45-75cm at treeline. The Nov. 4th rain crust exists up to 2600m depending on location in the forecast area, and is up to 50cm deep. SW winds have formed wind slabs in exposed terrain that have been reactive to skier traffic.

Avalanche Summary

On Monday a size 2 skier triggered wind slab avalanche above the Hilda Hostel at Parker Ridge failed down 70cm sending blocks of concrete like snow into the trees. Recent report of a size 2 skier triggered windslab in the alpine on a east aspect wind loaded feature. 

Confidence

Due to the number of field observations

Régions couvertes