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

LOW: The snow is stable on most slopes, and avalanches are unlikely. Even so, pockets with heightened conditions exist on isolated slopes due to stiff wind drifted snow, and midday loose wet avalanches are possible on some steep sunny slopes. Feathery surface hoar glitters on the snow surface across the zone, and the snow on many slopes has become sugary or faceted and very weak. Despite widespread weakness, the snow is generally stable. Use normal caution.

Problèmes avalancheux

  • Wind Slabs

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

    Some hard wind drifts formed on sugary faceted snow, and pockets with heightened avalanche conditions exist on isolated drifted slopes at all elevations. Although unlikely today, triggered avalanches consisting of stiff wind drifted snow remain possible. You might encounter drifts in unusual or unexpected places due to strong east winds on the last day of 2018.

    • 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.
    • Hard wind slabs have a nasty tendency to let you get well out on them before releasing.
    • Cracking in the snow is a red flag indicating potential instability.

  • Loose Wet

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

    Loose wet avalanches or sluffs are possible on steep sunny slopes during the middle of the day. Avoid travel on sunny slopes if the snow starts to get moist and gloppy, or if you see roller balls or natural sluffs...

Recent Activity

We could see a few natural loose wet avalanches or sluffs on southwest facing slopes in the Mount Naomi Wilderness yesterday afternoon... There was evidence apparent of a pretty good sized natural avalanche involving wind drifted snow on the northwest face of Mendon Peak in the Wellsville Mountain Wilderness, which likely occurred during the east wind event at the end of 2018...

Snow and Weather

The snow is stable in most areas and avalanches are generally unlikely. But, triggered avalanches involving stiff wind drifted snow remain possible on very steep drifted slopes in the backcountry. Drifts formed with the strong east winds on 12/31/18 in unusual places at all elevations.

The Tony Grove Snotel at 8400' reports 26º F this morning and there's 40"of total snow containing 84% of average SWE. It's a warm 27º F at the 9700' CSI Logan Peak weather station, and west-southwest winds are currently averaging about 21 mph.

High pressure aloft will shift east of Utah today, and a southwesterly flow will develop. Southwesterly flow will continue to increase tomorrow ahead of the next approaching storm system. Today will be mostly sunny and warmer in the mountains, with a high temperature at 8500' around 35º F and 10 to 13 mph southwest wind. Tonight will be partly cloudy, with a low around 17º F and 13 to 15 mph southwest wind. Tomorrow, we see increasing clouds and wind, a high temperature near 36º F, and 17 to 23 mph south-southwest wind.

The shallow snow on the ground in many areas has become loose, sugary, and faceted in the past couple weeks, and this 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 is widespread across the zone. Lacking a slab of stronger snow on top for now, the sugary snow is currently stable despite it's weakness.

Additional Info

I will update this forecast tomorrow morning.

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.

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 a problematic persistent weak layer.

General Announcements

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.

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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.

Régions couvertes