Bulletin d’avalanche

South Rockies

Mar 25 – 26, 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
2 · Modéré
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Points saillants

Warm temperatures and sunshine are the main drivers of avalanche hazard at the moment. Minimize your exposure to large slopes if the snowpack is becoming moist or wet.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Forecast southwesterly winds could redistribute dry snow, scouring windward slopes and forming fresh wind slabs in exposed lee terrain. Warm temperatures and sunshine could make these more sensitive to triggering.  

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    Expect loose wet slides on steep sun-exposed slopes during the day. These sluffs could gain considerable mass.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    3–5
    Rapid warming and solar radiation could make deeper persistent weaknesses more susceptible to triggering, especially and sun-exposed and thinly snow-covered slopes. 

Confidence

Fair - Due to the number of field observations

Weather Forecast

Thursday: Cloudy with sunny breaks. The freezing level rockets up to 2800 m, maybe even higher. Winds are moderate from the SW. Friday: A mix of sun and cloud. The freezing level remains near 3000 m and winds are moderate increasing to strong from the SW. Saturday: Possible showers/flurries. The freezing level is near 2200 m and winds are strong from the SW.

Avalanche Summary

There are no new reports of avalanches from the region for the past couple days. However, neighbouring regions reported some loose dry slides on Tuesday and widespread natural slab avalanches to size 1.5 above 1800 m on Monday.

Snowpack Summary

Light snow continues to accumulate above 1500-1700 m. Many areas have likely received 20-30 cm in the past several days. Periods of strong W-SW winds may have redistributed the new snow in exposed high elevation terrain, creating fresh wind slabs on lee and cross-loaded slopes. Lower elevation slopes are probably moist or wet and the snowpack continued to rapidly dwindle. A weak rain crust from last weekend is down 30-50cm and generally seems to have a good bond with snow above. There are a couple older persistent weak layers in the midpack that are still intact and have the potential to wake-up with substantial warming or heavy loading. Cornices may become fragile with afternoon warming.

Régions couvertes