Bulletin d’avalanche

Banff Yoho Kootenay

Feb 3 – 4, 2019Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Great ski quality in sheltered areas.  Give the new snow time to settle before committing to bigger terrain features with consequence.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2.5
    25-40cm of new snow has fallen under warmer temperatures at all elevations which will be reactive in the short term. The Jan. 17th layer is buried up to 65cm deep and consists of surface hoar, facets or crust and can be found up to 2300m.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    The new snow load may start waking up the deep persistent facet weakness down 80-160 cm. This is of greatest concern in shallow snowpack areas where the basal facets are weakest.

Weather Forecast

Frigid arctic air will win the battle for the weekend with temperatures down to -30C for the weekend and highs below -20C.  Winds will diminish as we switch to an E/NE flow with no snow in the immediate forecast. 

Snowpack Summary

25-40cm of new snow with moderate to strong variable winds. Up to 65cm sits over the Jan.17 surface hoar which has been found up to 2300m. The mid-pack is quite dense above the Dec 10 interface down 80-160 cm. In shallower areas weak facets and depth hoar exist below the Dec 10 interface. In deeper snowpack this basal weaknesses is less pronounced

Avalanche Summary

Local ski hills reported avalanches up to size 2 within the storm snow. No other avalanches were observed or reported with limited visibility.

Confidence

Régions couvertes