Bulletin d’avalanche

Mt Hood

Jan 20 – 21, 2020Northwest Avalanche Center
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Danger d’avalanche

Wed
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Stable snow conditions exist after yesterday’s warm temperatures. New snow and wind arriving Tuesday will begin to develop new avalanche problems later in the day. Look for changing conditions throughout the day and stay clear of steep, lee slopes rapidly accumulating more snow than the surrounding slopes.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1

    New snow and wind will begin to develop wind slabs on lee slopes at upper elevations by Tuesday afternoon. A melt-freeze crust exists on most aspects. Expect generally stable conditions during the day, but as snow accumulates, investigate the bond between new snow and the crust below using small test slopes. Look for blowing snow, fresh cornice development and cracks in the snow as signs that you could trigger an avalanche on similar slopes. Avoid slopes steeper than 35 degrees on which wind transported snow is accumulating more rapidly than nearby slopes. 

Snowpack Discussion

New Regional Synopsis coming soon. We update the Regional Synopsis every Thursday at 6 pm.

Discussion

Warm weather and clearing allowed for the snowpack to continue settling and stabilizing. An active cycle of loose wet avalanches also helped stabilize conditions near and below treeline. A slight crust now covers the generally stable snowpack. Upper elevation slopes also experienced some warming, but cold, dry snow still exists under the surface and weak layers in the recent storm snow may still exist.

Clearing on Sunday offered the first look at the upper mountain after an active 10 days of weather. A very large avalanche was observed on the Newton Headwall. It likely occurred during the storm last week, but highlights continued uncertainty about the snowpack at upper elevations.

A very large crown around 10,000’ on the Newton Headwall of Mt Hood which likely occurred during the storm last week. Photo: Kevin Kayl

Debris from the Newton Headwall avalanche in Newton Canyon. Debris filled the valley floor and extends to 5000’! Photo: Nick Burks

Régions couvertes