Bulletin d’avalanche

Central Cascades

Central Oregon Avalanche Center
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Danger d’avalanche

Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Périmé — ce bulletin a expiré 4 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Mostly sunny skies and temperatures well above freezing will lead to Wet Loose avalanches.  These avalanches are most likely and will be the largest on South slopes which will be the warmest, and also have the most soft snow due to previous windloading.

Problèmes avalancheux

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–1.5

    Heat from the sun and temperatures climbing above freezing lead to melting of the surface snow.  As the proportion of liquid water to ice crystals increases the snow can no longer "cling" to the slope and a Wet loose avalanche occurrs.  This type of avalanche is most prevalent on steep South slopes which receive the most heat from the sun.  It is unlikely that this melting will extend much into the rain crust that exists in our upper snowpack, so any avalanches will be limited to the soft surface snow.  On many aspects this snow is only a few inches deep, but on some wind loaded South slopes there is 10 inches to a foot of snow overlaying the crust.  These are the slopes I would be careful on.

Avalanche Discussion

On Sunday, one of our observers saw shooting cracks and felt a collapse on a SouthWest slope on Broken Top.  Saturday's wind slabs seem to be increasingly stubborn, but still reactive.  I am optimistic that after a warm clear day on Sunday they will continue in that direction.  I am concerned that Saturday's  Wind Slab problem could become Monday's Wet avalanche problem as temperatures will reach above freezing and the forecast is for mostly sunny skies.  Take the extra time to evaluate slopes that have increased deposition from previous windloading, especially as the day heats up.

Régions couvertes