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

THE DANGER IS ON THE RISE. THE AVALANCHE DANGER STARTS AT CONSIDERABLE THIS MORNING BUT WILL REACH HIGH BY THE AFTERNOON. Natural and human triggered avalanches are expected on many aspects and elevations, particularly in areas that see the most snow and wind. Wet avalanche activity is likely in the low elevations. Those without excellent avalanche and route finding skills should avoid the backcountry through the Monday/MLK weekend.

While the backcountry will be dangerous over the next several days, enjoy the Greatest Snow on Earth at some of the Greatest Ski Resorts on Earth where they employ teams to help mitigate the risk. REMEMBER that if you're going out of bounds, you're entering into Considerable to High avalanche danger.

Problemi valanghivi

  • Loose Wet

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

    The warm early start to the storm may allow the rain/snow line to reach 7000-7500' today. Wet avalanches will be possible at these elevations and may run naturally at and after the onset of rain. Gullies and terrain traps may fill with wet loose debris. This hazard may be of particular interest to otherwise "low risk" groups such as trail runners, snow shoers, and people walking their dogs.

  • Wind Slabs

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

    Overnight and newly developing soft and hard wind drifts are expected on many aspects and elevations today and may be triggered at a distance. Avoid steep cross-loaded gullies and note that drifts may be well down off the ridgelines. Natural activity is expected today with the new snow and strong winds. Cracking and collaspsing are immediate signs of instability.

  • Persistent Slabs

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

    The snowpack has many new and old generally strengthening weak layers from early season and during the Christmas/New Year's holiday season. These have been more prominent at the mid and low elevations. Surface hoar is a notoriously tricky weak layer and the Ogden mountains may have one or two distinct layers of this frost in protected, if localized terrain. They are problematic in that they can release on very low slope angles (even less than 30°) and are often triggered at a distance. Be aware that you may trigger these from below.

    Forecasted snow and wind will be a good test for these weaknesses, particularly in thinner snowpack areas of generally less than 3' in depth. Note that any new storm and wind slab avalanches may step down to these old instabilities, particularly on northwest to southeast facing slopes.

Avalanche Warning

AN AVALANCHE WARNING HAS BEEN ISSUED FOR THE MOUNTAINS OF NORTHERN AND CENTRAL UTAH, TO INCLUDE THE BEAR RIVER RANGE, THE WESTERN UINTAS, THE WASATCH RANGE, AND THE MANTI-SKYLINE PLATEAU. STRONG WINDS AND HEAVY SNOWFALL WILL PUSH THE AVALANCHE DANGER TO HIGH. NATURAL AND HUMAN TRIGGERED AVALANCHES ARE LIKELY. AVOID BEING ON OR BENEATH STEEP MOUNTAIN TERRAIN. AN ELEVATED AVALANCHE DANGER WILL PERSIST THROUGH THE MLK HOLIDAY WEEKEND.

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Recent Activity

Yesterday's storm snow was quite sensitive in the morning to midday hours with many natural and skier triggered avalanches 4-8" deep and 75' wide on many aspects down to roughly 7000'. Some of these storm snow avalanches were triggered at a distance. Backcountry travelers triggered both soft and hard slabs in the upper elevations. One remotely triggered avalanche near Chili Peak stepped into recent surface hoar layering a foot deep and 60' wide on a not so steep northeast facing slope at 7600'.

Snow and Weather

It appears that yesterday's 6-10" of new snow yesterday was just the teaser. The next potent storm is on the doorstep and we'll see upwards of another 1-2'+ of new snow through tomorrow midday/afternoon.

Currently, skies are overcast with mountain temperatures in the upper 20s to low 30s. Trailheads are in the upper 30s to low 40s. The winds are already the main player, having ramped up overnight from the southwest. They're blowing 40-50mph with gusts to 70. In this warm, pre-frontal environement, the rain-snow line may reach toward 7500' today. The cold front arrives tonight.

General Announcements

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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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