Bulletin d’avalanche

Waterton Lakes

Apr 6 – 9, 2015Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

The new snow that fell with another blast of winter over Easter will quickly be affected by periods of heating expected on Tuesday and more so on Thursday. Expect an increase in avalanche activity as the sun comes out on these days.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Slabs up to 50cm deep have formed over the crusts with the recent snow. These soft slabs have formed with winds from unusual directions and are likely to be found along ridge crests and in cross loaded features within a slope.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–2
    The new snow is likely to fail easily in very steep terrain naturally however travelers will experience sluffing in steep terrain as they travel through. Manage your group carefully to prevent being caught by these sluffs especially above cliffs.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    As the sun comes out on Tuesday expect moist snow to develop and fail naturally first on solar slopes and then on lower elevation shaded slopes. This should be more serious on Thursday with clear skies and a higher freezing level expected.

Weather Forecast

Winds should return to westerly Tuesday limited clear patches, freezing levels should reach 2000m. Wednesday winds should diminish allowing for convective flurries to produce a limited amount of snow with a freezing level near1800m. Clearing and light winds Thursday will allow for significant heating with freezing levels expected to reach 2200m.

Snowpack Summary

Early last week, a solid crust could be found everywhere but above 2400m on North Aspects. At the end of last week West winds built windslabs with 5 to 10 cm of new snow TL and above over this crust. Since Saturday NE winds have brought an additional 20 cm of snow with a bit more yet to come Monday night. Cornices have seen some fragile new growth.

Avalanche Summary

Visibility has been poor over the last few days however neighboring areas are reporting that the new snow is failing as loose dry avalanches to size one. This activity can be expected to continue heating causes a transition to loose wet activity instead.

Confidence

Timing or intensity of solar radiation is uncertain

Régions couvertes