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

Very dangerous avalanche conditions exist in the backcountry, and people should avoid travel in all avalanche terrain today. The danger is HIGH at mid and upper elevations on slopes facing the north half of the compass. Dangerous conditions exist on all other mid and upper elevation slopes, and people could also trigger avalanches on steep slopes at lower elevations. Natural avalanches are likely, especially during periods of particularly heavy snowfall, and some of these could run down avalanche paths into lower elevation runout zones.

Problemi valanghivi

  • Persistent Slabs

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

    Slab avalanches breaking on a persistent weak layer near the ground are likely today. This layer of weak, sugary facets can be found 6-12 inches above the ground just above a hard ice crust that caps old snow from October and early November.

    On Friday in Paris Flats and Bloomington Canyon, Mark and his riding partners found this layer in every pit (see the photo below) on slopes that faced the northern half of the compass. Avalanches breaking on this layer will be 3-4 feet deep or deeper on heavily wind loaded slopes. Avalanches failing on this layer may also break hundreds of feet across.

  • Wind Slabs

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

    Winds blowing from the south, southwest, and west have been transporting snow during the last several days. These winds drifted snow onto slopes that have a persistent weak layer of sugary facets near the ground. Wind slabs will make avalanches breaking on the facets larger, deeper, and more deadly. Avalanches of wind drifted snow are also possible where there is no apparent faceted persistent weak layer. Avalanches could fail on a density change within drifted new snow or on a thin, not-so-obvious weak layer.

    Avoid all steep slopes, and especially avoid slopes with obvious wind drifting where avalanches are very likely to occur.

  • Storm Slabs

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

    New snow may produce natural soft slab avalanches in steep terrain today, especially during periods of intense snowfall. Avoid travel on and below steep slopes during today's storm, stay well clear of avalanche paths and potential runout zones, even at lower elevations.

Avalanche Warning

THE AVALANCHE DANGER IS HIGH WITH DANGEROUS AVALANCHE CONDITIONS.

AN AVALANCHE WARNING HAS BEEN ISSUED FOR THE MOUNTAINS OF MUCH OF THE STATE OF UTAH, INCLUDING THE WASATCH RANGE...BEAR RIVER RANGE...UINTA MOUNTAINS...AND THE MANTI-SKYLINE.

HEAVY DENSE SNOWFALL AND STRONG WINDS HAVE CREATED DANGEROUS AVALANCHE CONDITIONS. BOTH HUMAN TRIGGERED AND NATURAL AVALANCHES ARE LIKELY. STAY OFF OF AND OUT FROM UNDER SLOPES STEEPER THAN 30 DEGREES.

Special Announcement

Avalanche conditions are very dangerous in the backcountry, and we are worried about an accident happening this week. When we look at accidents, this winter's weather pattern matches what we see time and time again. Early season snow (October & early November) followed by a dry period (November and first week of December) that weakens the snowpack followed by a stormy period that builds a slab and adds stress to the weak layers underneath.

  • The outlook for safer conditions in the near future is good, but for now, please ask your friends and riding partners to be patient and not let powder fever lure them into avalanche terrain.

Recent Activity

There were no avalanches reported yesterday, but that doesn't mean there weren't any. Clouds and snowfall have made it hard to see many suspect slide paths.

  • Please report any evidence of natural avalanches if you come across it in the next few days.

Check HERE for all the latest observations and avalanche activity.

Snow and Weather

Snowfall eased up overnight, but it's picked up steam again this morning. Yesterday, 11 additional inches of snow accumulated at the 8400' Tony Grove Lake Snotel, and the station reports 4.2" of SWE since Thursday morning (12-23-2021). Southwest wind increased once again overnight, and this morning it's blowing around 40 mph with gusts near 70 mph at the 9700' CSI Logan Peak weather station. I'm reading 15°F at Tony Grove and 8°F at Logan Peak this morning.

Expect heavy snowfall, blowing snow, and strong southwest winds in the mountains again today, with steady temperatures around 15°F at 8500'. More than a foot of snow is forecast to accumulate on upper elevation slopes again today, and snowfall will continue into tonight.

Very dangerous avalanche conditions exist in the backcountry and large natural avalanches are likely. People should avoid all travel in avalanche terrain and stay off and out from under steep slopes including obvious or historic avalanche paths.

Additional Info

  • Always follow safe backcountry travel protocols. Go one person at a time in avalanche terrain, while the rest of your party watches from a safe area.
  • Check your avalanche rescue equipment, change your batteries, and practice often with your backcountry partners.
  • Be very careful, keep your speed down, and stay in control. Encounters with shallowly buried rocks or down trees in the early season have led to many season-ending injuries.

General Announcements

Who's up for some free avalanche training? Get a refresher, become better prepared for an upcoming avalanche class, or just boost your skills. Go to https://learn.kbyg.org/ and scroll down to Step 2 for a series of interactive online avalanche courses produced by the UAC.

  • Check out all the upcoming education classes and clinics HERE.
  • Please submit your observations from the backcountry HERE.

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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