Bulletin d’avalanche

Waterton Lakes

Mar 22 – 24, 2013Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Sat
Sun
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Great skiing at higher elevations with 20cm of new snow, but still fair at lower elevations with new snow starting to cover the recent crust. Watch for solar heating to raise the hazard on sunny slopes Saturday and especially Sunday.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Moderate West winds are building windslabs on N & E aspects near ridge crests in open areas treeline and above. These slabs are currently thin and spotty near treeline but will be more developed above. We would expect these to settle quickly and bond

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    With the clear skies forecast on Sunday expect activity on solar aspects as things heat up. Most of this will likely be black body starts or minor surface sluffing but if the moisture penetrates to the well developed crusts this could produce more.

Weather Forecast

Friday, Saturday: overcast with light flurries, light winds, highs of -5 at tree line, 5-10 cm total. Sunday increasing winds out of the North, clear skies with the temperatures increasing to -3 at tree line. The increased solar radiation on Sunday will have a strong effect on the surface layers and affect stability on the snow above the crusts.

Snowpack Summary

20cm new snow overlies the March 21 rain crust that can be felt as high as 1900m and a sun crust that goes to ridge top on S aspects. This HN tapers with elevation covering moist snow and a weak crust below 1600m. There is 40 to 60 cm over the March 15 rain crust that is present to 2400m. Thin wind slabs forming at ridge crests N to SE aspects

Avalanche Summary

There has been a fair amount of loose dry activity out of extreme terrain after last week's major storm but surprisingly little slab activity. Yesterday rain as high as 1900m generated minor loose moist activity at lower elevations. New wind slabs are now forming as winds from the West have increased.

Confidence

Timing or intensity of solar radiation is uncertain

Régions couvertes