Bollettino valanghe

Mt Hood

Northwest Avalanche Center
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Pericolo valanghe

Thu
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
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Non aggiornato — questo bollettino è scaduto 6 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Travel cautiously near wind drifted slopes steeper than 35 degrees and steer around steep start zones especially near ridgelines where you see evidence of windblown snow or fresh accumulation over 6 inches deep.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2

    Recent windblown snow has formed wind slabs 1-2 feet deep on lee slopes. Several weak layers exist in the surface snow from periods of sunshine and light snow. All of this sits above mid-January's stout crust. Over the last several days, winds have been strong enough to transport snow, but not as intense as we are often accustomed to on Mt Hood. Very strong winds have ramped up Tuesday and likely built new, stiff wind slabs above treeline. Take the time to examine the bond of recent snow to older crusts before committing to slopes steeper than 35 degrees and steer around steep start zones near ridge crests when traveling on wind loaded slopes.

    Example: Wind textured snow surfaces and drifts like these serves as great clues that the wind affected the snowpack and may have formed wind slabs on nearby slopes.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1

    Warming temperatures over the last two days have stabilized the snowpack below treeline, but a decent shot of snow is expected with cool temps Tuesday night as a result of strong post-frontal shower activity. Use caution around slopes over 35 degrees where you find 6 or more inches of recent snow and on convex rolls and unsupported terrain features such as slopes above cliffs or creeks. 

Avalanche Discussion

Light snow over the last several days has been easily transported by upper elevation winds. Fresh wind slabs of 1-2' are still growing. The recent snow sits above 10-15" of consolidating lower density snow that arrived in several installments over the course of last week. The stout mid-January crust is considered the new "ground" moving forward with a strong snowpack structure in place below this layer. Weak and faceted snow just above the stout rain crust was responsible for a number of avalanches Thursday-Saturday, but recent observations suggest these facets are gaining strength. The interface between recent snow and the solid crust is still worth investigating before committing to steep and open slopes.

During the ongoing Covid-19 pandemic, continue to follow the latest guidance from local, state, and federal health officials. Avoid unnecessary risks that could impact first responders and stress medical resources.  Wear a mask when appropriate, practice social distancing, and consider recreating closer to home.

Regioni coperte