Bulletin d’avalanche

South Rockies

Jan 28 – 29, 2015Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

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

Spring conditions with overnight freezing and daytime warming.

Problèmes avalancheux

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Forecast periods of strong solar radiation may result in continued moist or wet loose snow avalanches.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–5
    Very warm daytime temperatures and high freezing levels may result in deep persistent slab avalanches releasing naturally from strong solar radiation or cornice falls, and continuing to be sensitive to human triggers.

Confidence

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

Weather Forecast

The freezing level should drop to valley bottoms overnight, and then rise back up to about 1500 metres during the day. Expect continued sunny skies and light winds during the day on Thursday. We should see another good re-freeze to valley bottoms overnight and into Friday morning as the cooling continues. More sun and light winds on Friday. Saturday should be cooler with cloud and moderate Southwest winds developing in the morning, and light precipitation starting overnight.

Avalanche Summary

No new avalanches reported

Snowpack Summary

The cool down has started, with freezing levels dropping down to valley bottoms. We are in a spring like diurnal melt-freeze cycle that should cap the snowpack with a strong crust by the end of the forecast period. Record warm temperatures may have resulted in moist snow and an isothermal snowpack at lower elevations on Monday. High freezing levels (above mountain tops) have settled the near surface snow which overlies a rain crust to 1900m, facets, and/or surface hoar. The mid-December crust/facet layer is down 40-80cm. There is not much snow left below 1600 metres elevation due to the prolonged warm weather and spring like conditions.

Régions couvertes