Bulletin d’avalanche

Jasper

Mar 26 – 27, 2013Parks Canada
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Archivé · expiré 14 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

The sun's strength is increasing. If the skies are clear, expect the avalanche hazard to increase in the afternoon. Watch for overhead hazards. Start and finish your trips early.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    Cornices will become increasingly prone to failure as the days get warmer. A cornice failure could provide a heavy trigger for an avalanche on the slopes below. Pay attention to what is above you and the temperatures during the day.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    The sun is warming the rocks on steep rock cliffs and gully features on Southerly aspects. Loose snow avalanches are starting in these features at all elevations later in the day. Cloud cover will determine if this occurs during the day.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    This continues to be the main concern with last week's avalanche activity showing deeper slabs that were sliding full depth on weak facets and in windloaded gully features on predominantly Northeast through to Southeast aspects.

Weather Forecast

A light snow flurry may occur overnight, but only trace amounts may arrive. Daytime skies are expected to remain clear or only light high clouds with strong diurnal changes in temperature through the day. Winds remain light ranging from the Southwest to the Northwest.

Snowpack Summary

A variable thick slab exists in alpine and treeline locations on a variety of aspects. It is over a strong midpack except in shallow locations where you could trigger basal facets near the ground.  A suncrust with varying thickness and strength exists at all elevations on steep South facing aspects. Below treeline, the crust breaks down by  midday.

Avalanche Summary

Numerous loose snow avalanches were observed  on steep South through West aspects at all elevations in the Icefields areas. They originate from steep rock bands and gully features where the sun heats the rocks.

Confidence

Timing or intensity of solar radiation is uncertain on Wednesday

Régions couvertes