Bulletin d’avalanche

Waterton Lakes

Apr 3 – 6, 2014Parks Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

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

Watch for even short periods of solar heating or rain to cause an increase in hazard beyond the posted Danger Ratings.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Although unlikely, a large load such as a cornice failure or another avalanche could trigger all of the snow above these strong crusts. Significant and sustained heating or rain may also allow these slabs to become active such as is forecast Monday.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Skiers looking for dry snow on shaded aspects should frequently test the surface layers.  A shear persists down about 30 cm  with preserved stellar snow flakes and surface hoar. Caution in steep and unsupported terrain is advised.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–2
    Daily heating and the sun will create moist snow at low elevations and on solar aspects. Intense periods of radiation will trigger avalanches or cause cornice failures that could trigger avalanches as well.

Weather Forecast

Up to 5cm Friday and 5 Saturday is forecast to arrive with continued moderate West winds. Strong solar heating Thursday with a poor recovery expected overnight. Freezing levels quickly returning to 1800m Friday then 1600m for Saturday and 1800m again for Sunday. A freezing level of 3000m with sunny periods will be a significant change for Monday.

Snowpack Summary

Surface crusts on East through West aspects have formed with the daily heating pattern. A shear persists down about 30 cm on shaded aspects on the 0325 interface. March crusts down 70 to 100cm on all but North aspects above treeline could be a problem with strong sustained warming or rain. Feb facets still a concern in high elevation thin areas.

Avalanche Summary

Only superficial loose moist activity has been seen over the last few days however a few significant slabs were triggered by cornice failures associated with wind and warming last weekend.

Confidence

Timing or intensity of solar radiation is uncertain

Régions couvertes