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 months ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Today, we have a MODERATE avalanche danger for three avalanche problems. On all mid- and upper-elevation slopes, expect new snow dry-loose avalanches (sluffs). Across all upper elevations, watch for and avoid wind-drifted slopes. Finally, on steep mid- and upper-elevation slopes facing west through north and east, a buried persistent weak layer remains, and it is possible to trigger a slab avalanche 1–2 feet deep.

Problemi valanghivi

  • Persistent Slabs

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

    The snowpack remains shallow, spatially variable, and structurally complex, and I do not trust it yet. Extended Column Tests continue to show propagation (see video).

    In mid- and upper-elevation wind-loaded terrain, human-triggered avalanches remain possible, with slab avalanches 1–2 feet deep failing on a buried persistent weak layer. Use conservative terrain selection, avoid steep wind-loaded slopes with thin or variable snow, and, as always, travel one at a time in avalanche terrain.

  • Storm Slabs

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

    Roughly 4–10 inches of new snow sit on top of a firm, supportable crust from the Christmas rain event. In steep, sustained terrain, this allows the new snow to run fast and far as loose dry avalanches (sluffs).

    Manage this problem by making deliberate slope cuts, traveling one at a time, and planning safe pull-outs where sluff can pass without knocking you off your skis, board, or sled. Always keep the sluff in view and avoid allowing it to build volume above terrain traps or in steep, sustained terrain.

  • Wind Slabs

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

    Northwest wind of 10–20 mph has likely created shallow drifts of wind-blown snow across upper-elevation terrain. These drifts will be most common on leeward slopes and near ridgelines, rollovers, and rock features. Human-triggered soft slabs of wind-drifted snow are possible, with depths up to about a foot, and could run fast and far on the slick crust below.

    Watch for signs of wind loading, such as smooth, rounded pillows or stiff, hollow-feeling snow, and avoid freshly drifted slopes.

General Announcements

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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Recent Activity

Snow safety teams report pockets of wind-drifted snow across upper elevations. No other avalanches were reported. Find all observations HERE.

Snow and Weather

Under clearing skies, mountain temperatures have finally turned cold, ranging from 3 to 10 °F, with wind chills well below zero. Along upper-elevation ridgelines, winds from the northwest are blowing 10–20 mph, with gusts reaching into the 20s and 30s. Storm totals range from 4–10 inches of new snow, containing 0.40–1.35 inches of snow water equivalent. The storm appears to have favored Powder Mountain.

Today, skies will continue to clear, with afternoon temperatures only reaching the low to mid-20s °F. The northwest wind will persist across upper-elevation terrain, blowing 10–20 mph as the storm exits the stadium.

I hate to say it, but today is shaping up to be the best day of the season so far. Cold temperatures, sunshine, a supportable Christmas crust with 4–10 inches of new snow on top make for decent riding... at least for this year.

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