Bulletin d’avalanche

Waterton Lakes

Jan 29 – Feb 1, 2013Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Be aware of the rapidly changing temperatures over the next few days especially if the sun comes out as the warming is occurring on Wed. Some great skiing can be enjoyed by riders that pay close attention to group management right now.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Isolated windslabs can be found near exposed ridgecrests. These may be buried in places by a few cm. Probe for these with your poles and avoid steep or unsupported terrain where wind slabs exist especially if they overlie sun crusts or facets.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    These are large and appear to be quite fragile right now. Consider the loose snow or windslab avalanches these could trigger below them and manage your exposure accordingly. Particular caution as these experience rapid temperature changes Wednesday.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–2
    Skiers in steep terrain should expect sluffing: slow but gain mass fast. This can be more serious where the old snow surface is very hard and it is difficult to hold an edge. Avoid confined features, pull off to the side, and do not ski above others.

Weather Forecast

Expecting cold air to invade from the Prairies over the next two days. Warming should occur Wednesday. Winds look to remain out of the NW which usually translates to calm conditions below ridge crests in the Cameron Lake Zone. Mainly dry with clear breaks but expect a few flurries as warmer air West of the divide collides with the polar air.

Snowpack Summary

Now 30-40 cm over 130123 interface. On steep South aspects the 0125 suncrust is now buried 25cm and sits 15cm above the 0123 interface which is found as a 1cm thick suncrust with 10 to 20 cm faceted crystals below. On other aspects the 0123 interface is old settled windslab or faceted crystals. Windslabs forming on exposed ridges above treeline.

Avalanche Summary

Many loose snow avalanches have been seen out of extreme terrain on North and East aspects over the last few days. Skiers in steep terrain also experience sluffing. These have generally been slow moving but gain considerable mass. It can be particularly difficult to hold an edge on the hard old snow interface as a sluff starts to move.

Confidence

Régions couvertes