Bollettino valanghe

Logan

Utah Avalanche Center
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Pericolo valanghe

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  • Limite del bosco
  • Sotto il limite del bosco
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In sintesi

HIGH: Very dangerous avalanche conditions exist in the backcountry, and heavy snowfall and drifting from strong winds will cause the danger rise further. Large natural and human triggered avalanche are likely. You could trigger avalanches remotely or from a distance.

  • Avoid travel in backcountry avalanche terrain.
  • Stay off and out from under steep slopes and obvious or historic avalanche paths.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely
    Dimensione
    3

    Very dangerous avalanche conditions exist on drifted slopes this morning after sustained strong south and west winds raked exposed slopes with lots of fresh transportable snow. Accumulating snow and continued strong southwest wind today will only cause the danger to continue to rise and the problem to become more widespread. Drifts have built up on widespread weak surface snow and buried sugary or faceted weak layers, and dangerous avalanche conditions exist at all elevations.

    • Watch for and avoid drifted snow on the lee sides of major ridges and in and around terrain features like cliff bands, scoops, gullies, stringers, and sub-ridges.
    • Avoid steep slopes that have a smooth, rounded appearance, or that sound hollow like a drum.
    • Softer, fresh wind slabs may be triggered remotely or from a distance today, while harder wind slabs have a nasty tendency to let you get well out on them before releasing.
    • Cracking or collapsing in the snow are red flags indicating instability.

  • Storm Slabs

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

    Fast moving and far running soft storm slabs and loose sluffs involving fresh snow are likely today on slopes with significant accumulations. Soft slab avalanches stepping down to sugary persistent weak layers are possible even in sheltered terrain. Loose sluffs were common in steep terrain at all elevations yesterday and the trend will likely continue today.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely
    Dimensione
    3

    The shallow snow on the ground in many areas has become loose, sugary, and faceted in the past couple weeks, and last week's very cold temperatures didn't help. We've found particularly weak snow at mid and lower elevations in the backcountry, and anywhere where the total snow is fairly shallow. At upper elevations and in deeper areas, weak sugary snow exists just under the surface. Feathery surface hoar was widespread across the zone. Wind drifts formed and storm slabs are building up on top of sugary or faceted snow, and if you trigger an avalanche today it will probably fail on a buried persistent weak layer. You could trigger avalanches remotely, from a distance, or below. This instability is likely to last for a while, and we don't expect the snow to stabilize very quickly.

    Feathery surface hoar is widespread across the zone and has been observed at all elevations including ridge lines and in avalanche starting zones. If this stuff stays intact when it's buried, it could become another problematic persistent weak layer.

Avalanche Warning

THE FOREST SERVICE UTAH AVALANCHE CENTER IN SALT LAKE CITY HAS CONTINUED A BACKCOUNTRY AVALANCHE WARNING.

* TIMING...THROUGH 6 AM MST TUESDAY. * AFFECTED AREA...FOR THE MOUNTAINS OF NORTHERN UTAH INCLUDING THE WASATCH RANGE, BEAR RIVER RANGE, AND UINTA MOUNTAINS.

* AVALANCHE DANGER...HIGH.

* REASON/IMPACTS...VERY DANGEROUS AVALANCHE CONDITIONS EXIST. HEAVY SNOW COMBINED WITH WIND WILL CREATE WIDESPREAD AREAS OF UNSTABLE SNOW. BOTH HUMAN TRIGGERED AND NATURAL AVALANCHES ARE LIKELY.

STAY OFF OF AND OUT FROM UNDERNEATH SLOPES STEEPER THAN 30 DEGREES.

BACKCOUNTRY TRAVELERS SHOULD CONSULT WWW.UTAHAVALANCHECENTER.ORG OR CALL 1-888-999-4019 FOR MORE DETAILED INFORMATION.

Recent Activity

Friday afternoon, when the danger was much lower, 3 lucky riders triggered a large hard slab avalanche on a south facing slope at about 9000' in elevation near Providence Peak. Luckily nobody got caught in the 4' to 6' deep and 300' wide avalanche consisting of wind drifted snow and failing on a sugary or faceted persistent weak layer. See Report HERE

Snow and Weather

Heavy snow and drifting from strong southwest and west winds is overloading widespread weak snow, and large avalanches are likely or occurring in the mountains today. Looks like 11" of new snow fell overnight at Beaver Mountain. The Tony Grove Snotel at 8400' is not updating this morning, but picked up 10" with 1.1" of SWE yesterday. It's 17º F at the 9700' CSI Logan Peak weather station, and west-southwest winds are currently averaging about 40 mph and gusting to 66 mph early this morning.

Unstable snow at low elevations was cracking and collapsing yesterday.

A weather disturbance will move quickly east across northern Utah today. High pressure aloft will follow this weather disturbance into Utah for midweek. Temperatures will drop into the teens during the day and 50 to 60 mph westerly winds will decrease to 25 to 35 mph. Winds could gust as high as 85 mph. Total daytime snow accumulation of 5 to 9 inches is possible. Tonight will be mostly cloudy, with temperature rising to around 20º F. Wind chill values will be as low as -5º F . 16 to 21 mph west wind will decrease to 10 to 15 mph after midnight. Little new snow is expected. Tomorrow will be partly sunny, with a high near 29º F , and south-southwest wind 8 to 13 mph becoming east in the afternoon.

Additional Info

I will update this forecast Wednesday morning.

General Announcements

The Beaver Mountain Backside is the backcountry, and it is avalanche terrain. If you cross the ski area boundary, you and your partners should carry and practice with avalanche rescue equipment. As always in the backcountry, practice safe backcountry travel protocols.

The new UAC IOS mobile app is now available on the app store. Check out the new "My Weather" feature. HERE

Check out the new free online avalanche course series developed by the Utah Avalanche Center. This is a great way to refresh your skills or prepare you for a Backcountry 101 or Level 1 class. HERE

Now is a great time to practice companion rescue techniques with your backcountry partners. Here is our practice video.

If you would like to get the daily advisory by email you subscribe HERE.

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This forecast is from the U.S.D.A. Forest Service, which is solely responsible for its content. The forecast describes general avalanche conditions and local variations always occur.

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