Bollettino valanghe

Ogden

Utah Avalanche Center
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Pericolo valanghe

  • Alta quota
  • Limite del bosco
  • Sotto il limite del bosco
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Non aggiornato — questo bollettino è scaduto 8 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Today the avalanche danger is MODERATE on steep upper elevation slopes where slabs of wind-drifted snow can be found. Be on the lookout and avoid, rounded, pillowy, wind drifted snow. Out of the wind effected snow the avalanche danger is LOW. As the day heats up the southerly facing terrain might become loose enough to produce a few small avalanches from the direct sun.

  • More info on wind drifted snow HERE.

Problemi valanghivi

  • Wind Slabs

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

    The unusual northeast winds have been headline news for the past few days. These winds were able to grab Sunday's low density snow and drift it to a wide variety of aspects and elevations. Most of these slabs seem to be welded in place. However, it's only been 48 hrs since the NE wind event. I would expect that some slabs might be sensitive to the weight of a rider, especially, in steep, rocky, unsupported terrain. Look for and avoid rounded pillows of wind blown snow. Approach the steep slopes with caution - these hard wind drifts will likely break above you.

    If you're planning on getting after it today, keep a few things in mind:

    • If you do trigger a wind slab where will it take you? cliff, trees, gulley?
    • Set yourself up for success and choose terrain with clean runouts.
    • Travel one at a time and keep an eye on your partner and be ready to help in case anything happens.
    • Be able to identify and avoid, pillowy, rounded and hollow sounding snow.
    • Avoid steep, wind loaded, rocky, terrain where your most likely to trigger a wind slab.

Recent Activity

No recent avalanches were reported yesterday in the Ogden area. There are two great observations found here.

Snow and Weather

It will be another glorious day in the mountains today with plenty of sunshine and warming temperatures. It's easy to see the temperature inversion as many upper elevation stations are reporting temperatures in the mid 20's °F. While the low elevation trailheads are sitting in the single digits. The brutal northeast winds finally gave up yesterday afternoon and have now shifted to the northwest with speeds of 5-15 mph gusting into the 20's at upper elevation ridge lines.

The snow surface is a mixed bag - in places the wind crusts will make it feel like you're on the moon, while other shady, sheltered slopes will have soft settled powder that was spared from the NE winds. Southerly facing slopes will be crusted this morning and should soften with day time heating. Regardless of the snow surface, it will be a very nice day to be in the mountains.

Photo: Jamie Bernstein, showing the beautiful snow surface.

Additional Info

As the avalanche danger decreases our terrain selection usually increases. Meaning we start venturing into bigger and steeper terrain with more consequences. One accident that really gave me a good perspective on wind slabs and terrain management happened in Montana on April 11th, 2015. Where a rider triggered a very small avalanche (10-20 feet wide and about a foot deep) and was swept off a 300' cliff.

Mark Staples gives us a good review of how even if you do everything right it can still go wrong. Give the wind slabs another day or two to bond and strengthen before committing to large terrain with bad consequences.

General Announcements

CLICK HERE FOR MORE GENERAL INFO AND FAQ

This information does not apply to developed ski areas or highways where avalanche control is normally done. This forecast is from the U.S.D.A. Forest Service, which is solely responsible for its content. This forecast describes general avalanche conditions and local variations always occur.

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