Bulletin d’avalanche

South Rockies

Mar 29 – 30, 2017Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

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

Avalanche danger will increase if the the sun comes out and we get strong solar radiation combined with high freezing levels.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    New wind slabs have developed in the alpine and at treeline. Wind slabs may not be well bonded to old surface crusts.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Watch out for wet snow at lower elevations or on sunny slopes if the sun comes out during the day.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    2–4
    Heavy triggers such as a cornice fall or wind loading are potential triggers for large avalanches on deep weak layers. Be aware of overhead hazard, and do not linger in avalanche paths at lower elevations.

Confidence

Moderate - Timing or intensity of solar radiation is uncertain on Thursday

Weather Forecast

Overnight: Flurries or light snow with strong westerly winds and freezing at 1300 metres by morning. Thursday: Mix of sun and cloud with periods of strong solar radiation. Light winds with daytime freezing up to 1800 metres. Friday: Mostly sunny with light winds and daytime freezing up to at least 2300 metres. Saturday: Unsettled with flurries or light snow, not much of a re-freeze below 2000 metres. Westerly winds developing during the day.

Avalanche Summary

No new avalanches reported.

Snowpack Summary

A few more cm of new snow overnight, combined with gusty southwest winds has developed new wind slabs in the alpine and at treeline. Over the past several days we've had 10-30 cm of heavy snow at higher elevations, which sits on a thick hard crust that is quite solid above 1700m. Below the new snow and crusts, roughly 50-90 cm of snow sits above the February crust and facet interfaces. In some areas there may still be a poor bond to these interfaces. The bottom third of the snowpack is composed of weak facets and full-depth avalanches over this basal weakness remain a concern, and may be triggered by large loads (eg: cornice fall) or warm temperatures (eg: full exposure to the sun).

Régions couvertes