Bulletin d’avalanche

Jasper

Nov 9 – 10, 2017Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
Sans niveau
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Points saillants

Marginal snow depth is barely covering ground features. Early season conditions exist.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    This is an early winter avalanche problem that exists in isolated pockets where the snow has drifted into small wind slabs and the slope is steep enough to slide. Mainly a concern for ice climbers in steep gullies or walking above cliffs.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Avoid terrain traps or steep SW overhead terrain where sun could initiate an avalanche. Likely a short lived afternoon problem being days are short and sun is relatively weak.

Weather Forecast

Thursday will be 1900m freezing level, light SW winds, none to possibly light flurries snow, and some sun. No significant snow is forecast for a few days. Temperatures are warming Thursday particularly on SW aspects if the sun comes out. 

Snowpack Summary

up to 2100m a spotty Oct 17 crust exists 10cm up from ground. It maybe lower elevations on N aspects. Oct 31 crust is 10cm down from surface above 2000m. Above 2000m 30cm plus is expected yet distribution varies with aspect, elevation, and wind exposure. Treeline, alpine gully features, and some lee alpine slopes will be wind loaded. 

Avalanche Summary

Steep SW slopes along Medicine lake up to 2500m releasing with solar on Wednesday starting as point release to ground. Some point releases initiated 10-15cm wide 30cm deep thin slab lower down. This was enough snow to entrain in features making them up to size 2. Small avalanches over rocky terrain, cliffs, or in terrain traps would be serious.

Confidence

Timing or intensity of solar radiation is uncertain on Thursday

Régions couvertes