Bulletin d’avalanche

Mt Hood

Northwest Avalanche Center
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Danger d’avalanche

Mon
Alpin
1 · Faible
Limite forestière
1 · Faible
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

You may encounter minor wet snow issues on steep sunny slopes. These lingering sluffs should be small and isolated, but don't be caught off guard in consequential terrain.

Problèmes avalancheux

  • Loose Wet

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

    As the sunshine thaws snow surfaces again on E-S-W aspects, there is a chance for additional wet loose activity. Be on the lookout for fresh rollerballs and pinwheels, especially around steep rocky outcrops in direct sun. Keep your return routes in mind as well - slopes you crossed early in the day could become wet and slushy by afternoon. Terrain traps such as valley bottoms, cliffs, or recently exposed talus will all increase the risk of even a small avalanche.

    (3/4/2022) Several small natural loose wet avalanches in Pollalie Canyon Photo: Andrew Kiefer

Avalanche Discussion

For Sunday, expect clear sunny skies, high temperatures in the upper 30s to low 40s, and a slight uptick in winds compared to Saturday. Be alert if you climb high into wind-affected alpine terrain, especially below cliffs, near cornices, and on rocky slopes where you may find a lingering wind slab.

The 2/26-3/2 atmospheric river event altered the snowpack leaving variable conditions. Below treeline, snow surfaces are icy and covered in tree debris with a few south and west-facing slopes melted out to bare ground. Between 5500-6500ft, 3-5in of cold recycled powder sits atop a firm crust; in these areas, you'll find the best travel conditions on sheltered northerly aspects and the best chance for lingering loose wet activity on E-S-W aspects. Above 6500ft, snow surfaces a mixed bag with plenty of wind-affected, grabby snow. 

There was an impressive avalanche cycle on Mt Hood earlier in the week during the wet and wild storm. During peak precipitation intensity on 2/28, several very large natural avalanches released high on the mountain. In a few cases, these avalanches ran through the rain/snow line around 8000ft and entrained significant wet snow creating very large, river-like debris piles. Cooling temperatures the past few days have allowed the snowpack to refreeze and stabilize. Check out a few of the largest documented avalanches from the 2/26-3/2 atmospheric river in our avalanche occurrence database: Clark Canyon, Eliot Glacier Headwall, White River Canyon.

Régions couvertes