Bulletin d’avalanche

Logan

Utah Avalanche Center
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Danger d’avalanche

  • Alpin
  • Limite forestière
  • Sous la limite forestière
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Périmé — ce bulletin a expiré 8 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

MODERATE: Heightened avalanche conditions exist in areas with where weak preexisting snow was overloaded by the Thanksgiving storm and on recently drifted upper elevation slopes. Dangerous human triggered avalanches are possible. Evaluate snow and terrain carefully.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2

    You could trigger dangerous persistent slab avalanches in shady upper elevation terrain that didn't naturally avalanche during the Thanksgiving storm. Even small avalanches can be very dangerous with such shallow snow cover. You could get dragged through rocks if you get caught and carried.

    • Very weak faceted snow exists under the Thanksgiving storm snow on shady upper and mid elevation slopes.
    • The weak snow was fairly shallow in the Logan Zone, so resulting slab avalanches will likely be on smooth slopes or in pockets between rocky anchors and terrain features.
    • Collapsing and cracking indicate that the snow is unstable. Many instances of whumpfs and shooting cracks were witnessed and reported in the last few days.

    The shallow snow under the fresh powder on north facing slopes at upper elevations is plagued by loose, sugary faceted snow.

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2

    Southwest winds picked up overnight and drifted snow, building stiff drifts on the lee side of sub-ridges and in and around terrain features like gullies, cliff bands, scoops, and tree stringers.. Avoid recently drifted snow in steep terrain.

Special Announcement

Join us on Wednesday December 5th to celebrate the coming of winter! Our 15th Annual Pray for Snow Party and Fundraiser is at The Cache with music from Two Headed Trout, pizza from Lucky Slice, beverages from Moab Brewery, and a raffle and silent auction if amazing donated items. Thanks for your support of avalanche awareness and education. We look forward to seeing you! Tickets available online: CLICK HERE.

Recent Activity

There were numerous natural and perhaps a couple remote triggered persistent slab avalanches in the central Bear River Range. Most of these likely occurred overnight Friday or early Saturday during the most intense period of the Thanksgiving Storm. The soft slab avalanches failing on weak faceted snow from mid November were 1 to 2 feet deep, and some were hundreds of feet wide. Evidence of many avalanches observed in the Tony Grove Area included blown-in crowns and debris piles in Miller Bowl wall to wall, Secret Slot, Blind Hollow Saddle into Rock Bowl, Grandfather Cornice, and pockets of Cornice Ridge.

(photo thanks to William Rouse)

Some blow-in evidence of a fairly widespread natural avalanche cycle that occurred during the Thanksgiving storm.

Snow and Weather

This morning the Tony Grove Snotel at 8400' reports one inch of new snow. It's 29º F and there's 22"of total snow containing 83% of average Snow Water Equivalent. It's 23º F at the 9700' CSI Logan Peak weather station and a west-southwest wind is blowing around 20 mph, with a gust of 38 mph recorded earlier this morning. Heightened avalanche conditions exist in the backcountry, and dangerous human triggered avalanches are possible.

Light snowfall in the mountains this morning should taper off by midday, but the next in a series of fast moving weather disturbances will move over the Logan Zone this afternoon. Expect a high temperature at 8500' around 30º F and west-southwest winds 5 to 15 mph. Snow levels will remain at around 6000' and 2 to 4 inches of snow could accumulate at upper elevations tonight. A stronger system is forecast for later Thursday into Friday. Although a split in this system appears likely, with more energy and moisture heading to southern and central Utah, it will likely bring additional snow to the mountains and rain to the valleys across the entire state. Much colder air will follow for the weekend into early next week.

General Announcements

The Tony Grove Road is open but not maintained for winter travel of wheeled vehicles. The road is likely to be sketchy again today, especially up high. The road is shared use with vehicles, sleds, pedestrians and dogs, so please use caution, keep your speed down and be nice.

Snow is starting to pile up on the slopes of Beaver Mountain, and managers are glad to allow uphill traffic. You can avoid the Tony Grove Road challenge, find generally safe conditions in lower angled terrain, and help pack out the ski hill. Remember, before it opens Beaver Mountain is the backcountry.

Join the UAC for the 2nd Annual Ogden Backcountry Bash at The Front Climbing Gym in Ogden. Beer, pizza, silent auction, prizes, and climbing! November 29 6:30 PM - 9:30 PM The Front Climbing Club, 225 20th street, Ogden UT 84401

Utah State University Outdoors Program is hosting a Know Before You Go avalanche awareness clinic on Wednesday November 28th at 7pm at the OP Rental Shop. The event is FREE and open to the public.

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

Remember your information can save lives.

  • If you see anything we should know about, please help us out by submitting snow and avalanche observations. HERE
  • You can call us at 801-524-5304, email by clicking HERE, or include #utavy in your Instagram.

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

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