Bulletin d’avalanche

Lizard-Flathead

Mar 13 – 14, 2018Avalanche Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Mild temperatures are expected in the morning followed by a cooling trend over the day. The best riding will be in areas sheltered from the warming and wind effects.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Wind slabs may linger in immediate lee slopes. Use caution when entering terrain features off ridges.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    High freezing levels, morning sun, and possible afternoon rain will warm the snowpack on all aspects. Pay close attention to the moisture of the snow surface and avoid overhead exposure. This problem will be reduced when the snow surface is frozen.

Confidence

Moderate - Timing or intensity of solar radiation is uncertain

Weather Forecast

WEDNESDAY: Morning sun and afternoon clouds with light snowfall at higher elevations and rain below, accumulation 1 to 2 mm, moderate southwesterly winds, alpine temperature 2 C, freezing level 2500 m dropping to 1500 m midday.THURSDAY:  Cloudy with light snowfall, accumulation 5 cm, light northwesterly winds, alpine temperature 0 C, freezing level 1500 m.FRIDAY:  Cloudy with light snowfall, accumulation 5 cm, light northeasterly winds, alpine temperature 0 C, freezing level 1500 m.

Avalanche Summary

Widespread loose wet avalanche activity to size 1.5 was observed on southerly slopes on Monday and Tuesday. Explosive control of cornices produced size 2 to 2.5 releases with no slabs released below.

Snowpack Summary

Warm air temperatures and daytime sun have produced moist snow on all aspects.  With dropping freezing levels, the moist snow will harden into a melt-freeze crust.  On shady aspects at high elevations, lingering wind slabs in lee features and loose dry in sheltered features may still exist.  These snow surfaces are sitting on patchy surface hoar in parts of the region.Deeper in the snowpack, the widespread mid-December and late November weak layers are composed of crusts and sugary facets which are down 200-300 cm. These layers have been dormant but may be awoken by a large trigger, such as a falling cornice.

Régions couvertes