Bollettino valanghe

Mt Hood

Northwest Avalanche Center
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Pericolo valanghe

Sun
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
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In sintesi

New snow and strong winds arriving overnight Friday will create fresh wind slabs on lee slopes. Navigate around slopes steeper than 35 degrees where you find drifted snow.

Problemi valanghivi

  • Wind Slabs

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

    Wind slabs will form rapidly overnight Friday and may run easily above a frozen crust that currently makes up the surface snow. Look for textured and firm snow on lee slopes as a sign you could trigger a wind slab avalanche. Steer around slopes steeper than 35 degrees directly below cornices and where you see snow drifted by the wind to avoid triggering a wind slab. Look for shooting cracks or fresh cornices as a sign that you could trigger an avalanche on a similar slope.

    (3/2/2021) Natural wind slabs at 9000 ft in wind-loaded start zones.

  • Loose Wet

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

    Most parts of Mt Hood will likely remain cloudy on Saturday, but wherever the sun shines, snow surfaces will weaken rapidly and create wet loose avalanches. Where you see wet snow surfaces or find yourself sinking into the snow more than 6 inches, navigate around slopes steeper than 35 degrees especially above terrain traps like cliffs and creeks.

    (4/9/2021) An example of small wet loose avalanches.

Avalanche Discussion

Snow surfaces have consolidated at Mt. Hood with cooler temperatures and strong winds, but fresh snow and strong winds overnight Friday will create wind slabs at upper elevations. Anywhere the sun shines will create the possibility of loose wet avalanches. Approach slopes over 35 degrees with caution. Direct sunshine may weaken the snow surface. Watch for wet snow surfaces and roller balls. If you see these signs, you could trigger a wet loose avalanche on sunny slopes steeper than 35 degrees. Use extra caution near terrain traps such as above cliffs and creeks.

Minimize your exposure to cornices if you travel on or below ridgelines. The sun has exposed rocks near ridgelines and on south and west-facing slopes. At low elevations, creeks may contain significant flow and snow bridges are beginning to become suspect.

As we continue into spring, we're experiencing a gradual transition from a colder layered snowpack to a wet spring snowpack. That transition takes place from the top down. If you dig down in the snow, pay attention to how deeply meltwater has percolated, and please consider sharing your finding on the public observations page. This will improve our ability to forecast wet avalanche problems as the spring snowpack evolves.

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