Bulletin d’avalanche

Waterton Lakes

Jan 31 – Feb 3, 2020Parks Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

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

15-30 mm of precipitation is expected with freezing levels rising to 2000m Friday-Saturday. Avoid avalanche terrain on Saturday and be mindful of your overhead hazard.

Problèmes avalancheux

  • Wind Slabs

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

    Strong southwest winds have created stiff wind slabs in lee features. New snow will make buried windslab difficult to spot.

  • Storm Slabs

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

    The snowpack is extremely variable in depth and strength. Rapid loading in expected to cause a widespread natural avalanche cycle late Friday into Saturday.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–3

    High freezing levels and a total of 10-30mm of precipitation may cause storm slabs to entrain wet loose avalanches at lower elevations.

Weather Forecast

Friday: Cloudy with rain & snow. Freezing level 2000m. Strong SW wind with gusts of 100km/h. 5-10mm of precipitation with periods of freezing rain.

Saturday: Cloudy with rain & snow. Freezing level 1800m. Strong-extreme SW winds with gusts of 120 km/h. 10-15mm of precipitation.

Sunday: Mostly Cloudy, isolated flurries. Freezing level valley bottom.

Snowpack Summary

Melt freeze crust up to 2000m. This surface crust will increase reactivity of storm snow arriving Fri/Sat. The upper snowpack consist of a 20-70cm windslab sitting over a well settled midpack. Strength of the snowpack will decrease with rising temps & new snow. Upper snowpack avalanches have potential to entrain wet loose snow below freezing level.

Avalanche Summary

No new avalanches observed.

Confidence

Forecast snowfall amounts are uncertain

Régions couvertes