Bulletin d’avalanche

Moab

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 4 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

The avalanche danger is MODERATE and human triggered avalanches remain possible on steep slopes near and above treeline that face W-N-SE.

The greatest danger exists on steep slopes facing NW-N-NE-E above treeline where a combination of wind drifted snow and a buried persistent weak layer could produce deep and dangerous avalanches 2'-5' deep.

Travel advice: Continue to avoid steep, wind drifted slopes; slopes with steep convexiites; thinner snowpack areas; and areas of steep, rocky, more radical terrain.

Problèmes avalancheux

  • Wind Slabs

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

    Strong southwest through northwest winds earlier in the week created stiff slabs of wind drifted snow on leeward slopes primarily on N-NW-E aspects. Crossloading has also occurred creating isolated drifts on the leewaard sides of terrain featuers such as gully walls and sub ridges on slopes facing W and SE. Recognizable by their smooth, rounded appearnce, stiff wind slabs may sound hollow underneath. Wind slabs have gained strength and will be more stubborn to release which means you may be further down the slope before they break above you. A triggered wind slab also has the potential to step down to the buried persistent weak layer causing a deeper and more dangerous avalanche. Avoid, steep, wind drifted slopes.

    Photo illustrates "fat" areas of wind drifred snow on this steep, NE face. Continue to avoid this type of terrain.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    3

    The widespread persistent weak layer (PWL) that formed in November is showing signs of strengthening and stability tests continue to be less reactive. This means avalanches are becoming harder to trigger but the consequences remain the same. Any avalanche triggered on this deeply buried PWL would be large and unsurvivable. The greatest risk exists on steep, wind drifted, northerly aspects above treeline. As we start to think about easing into larger terrain, areas to avoid include slopes with steep convexities or blind break-overs; thin snowpack areas along slope margins or near rock outcrops; and areas of steep, rocky, more radical terrain.

    For more information on this check out Dave's fieldwork from Tuesday.

    A deep and strenghthening snowpack exists in most areas near treeline and below. In these areas the November persistent weak layer is deeply buried and becoming harder to affect. Above treeline, snow depths are much more variable and trigger points are much more plentiful, and the problem can't be ruled out yet.

Special Announcement

Improve your avalanche awareness and rescue skills and sign up for our Backcountry 101 Class on January 20, 21.

Road Conditions: The road is plowed but areas of soft snow exist near the top. AWD and good tires recommended.

Grooming: All trails were groomed yesterday and conditions are excellent.

Recent Activity

No new avalanches have been reported. Here is the La Sal Avalanche Database.

Snow and Weather

24 Hour Snow 0" 72 Hour Snow 3" Season Total Snow 138" Base Depth at Gold Basin 59"

Winds on Pre Laurel Peak SW 5-10 Temp 22F

Weather

Short lived high pressure will provide mostly sunny skies, light SW winds, and warm temperatures rising up into the low to mid 30's. High clouds will begin streaming into the area ahead of the next approaching system. Saturday we'll see mostly cloudy skies, breezy SW winds, with snow showers developing by Saturday night. The main event looks to be on Sunday with with up to a foot of snow looking likely at this time. The next system is queued up for Mon-Tues.

General Conditions

At around 200% of normal, a generally deep and strengthening snowpack exists. The exception is in wind affected terrain, primarily above treeline. The snowpack in this zone is the most complex where deep drifted slopes alternate with scoured ones creating a landscape where thin snowpack areas exist next to deeper areas. Near treeline and below, the November persistent weak layer is deeply buried and difficult to affect. But in the wind zone, the overlying slab is thinner, and there is a greater abundance of shallow trigger points. Stiff areas of wind drifted snow also pose a threat, and a triggered wind slab could step down causing a deeper and more dangerous avalanche.

In our travels yesterday we stepped things up a bit and dipped our toes into avalanche terrain for the first time this season. We remained cautious and continued to avoid steep wind drifted slopes as well as slopes with convex features. We didn't jump into any chutes, and we avoided areas of steep, rocky, more radical terrain. Consider your slopes carefully as you begin to venture out. Things are starting to turn the corner, but it's not yet green light, and deep and dangerous avalanches remain possible.

Travis Nauman and Josh Darling were up yesterday and they reported a strengthening snowpack and "hero snow" conditions with 3"-7" on a supportable base. Check out their observation here.

Snowpack and Weather Data

Gold Basin Storm Stake (10,000')

Gold Basin SNOTEL site (10,000')

SNOTEL site near Geyser Pass Winter Trailhead (9600')

Wind Station on Pre-Laurel Peak (11,400')

NWS forecast for the La Sal Mountains.

Additional Info

The Avalanche Beacon Training Park is up and running just above the Geyser Pass Traihead. It's right there and easy to use, so get some practice as you head up for your next tour.

General Announcements

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. This forecast will be updated by 7:30 tomorrow morning.

Régions couvertes