Bollettino valanghe

Moab

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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Non aggiornato — questo bollettino è scaduto 4 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

The avalanche danger is CONSIDERABLE near treeline and above on slopes that face W through N through E. Dangerous, human triggered avalanches, failing 2'-4' deep on a buried persistent weak layer are likely. On southerly aspects, and at lower elevations, the avalanche danger is MODERATE andhuman triggered avalanches are possible. Stick to low angle slopes less steep than 30 degrees, and continue to be mindful of the low snow conditions.

Problemi valanghivi

  • Persistent Slabs

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

    A persistent weak layer of faceted snow that developed during the cold dry period in mid November is now present on all aspects. The condition is most dangerous and wide spread on slopes facing the north half of the compass, where wind drifted snow has built thick slabs on top. Observers yesterday also reported collapsing on southwesterly aspects so south facing slopes can't be ruled out. This persistent weak layer is settling in and will be with us for awhile so plan on avoiding slopes steeper than 30 degrees, especially those that face W-N-E, for the foreseeable future.

    Photo illustrates the obvious poor snowpack structure. As more snow is piled on top, stress on the weak snow will increase, as will the likelihood of triggering deeper and more dangerous avalanches.

  • Wind Slabs

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

    Blowing and drifting snow is creating fresh slabs on northerly aspects. Though fresh deposits of wind drifted snow are a concern, the primary issue is continued loading on the buried persistent weak layer. Avoidance of steep, northerly facing slopes is the only realistic strategy.

Special Announcement

Road Conditions: Grand County plowed the road to Geyser Pass Trailhead yesterday. The road is snow packed and dirt. AWD and good tires are recommended.

Grooming: The Geyser Pass Road above the winter trailhead closes on Dec 15. Grooming will commence after that.

Join us for the 1st Annual UAC Moab/LUNA Winter Kickoff Party on Saturday, Dec 10 at the MARC. The event will be from 7-9 PM. Get your tickets here.

The Utah Avalanche Center wants to give you free batteries for your beacons. Head on over to Moab Gear Trader to pick up your free batteries. While you are there, scan a QR code to fill out a quick survey and be entered to win some avalanche rescue gear.

Join the Utah Avalanche Center and the Division of Outdoor Recreation to celebrate the Fourth Annual Avalanche Awareness Week, from December 4 - December 11. Click HERE to view a full list of events throughout the state.

Recent Activity

Dave Garcia and company observed this significant natural avalanche in Gold Basin yesterday that likely ran during the height of the storm on Wednesday night. It looks to be 2'-4' deep and about 200' feet wide on a northeasterly aspect. This is the current problem we are dealing with.

For a complete list of avalanches in the La Sal Range go here.

Snow and Weather

24 Hour Snow 0" 72 Hour Snow 14" Season Total Snow 55" Base Depth at Gold Basin 32"

Winds on Pre Laurel Peak S 20-25 G30 Temp 19F

Weather

Southerly winds ramped up over night as a weak shortwave trough began it's trek through the region. As it tracks by to the north, we'll be left with cloudy skies and breezy SW winds. Skies should clear later today as the system moves on followed by a transient ridge and dry conditions through the weekend. Shaping up over the West Coast is the next significant storm system. This should begin impacting our area late Sunday night with snow likely into Tuesday. Keep the train coming! General Conditions

This week's storm system gave the snowpack a much needed boost and there is now enough coverage for cautious backcountry skiing and riding. The recent snow load also pushed the fragile snowpack to its breaking point. Observers in the backcountry yesterday reported widespread collapsing and whumphing and noted at least one significant natural avalanche in Gold Basin. The entire snowpack beneath the November 28 storm is loose, weak, and faceted and we now have 18" - 20" of snow sitting on top of that with considerably more in wind drifted areas. This translates to unstable conditions, with a poor snowpack structure that you can feel simply by poking your ski pole down through the snow.

I shot this video on Wednesday just as the storm was getting going.

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

If you are getting up into the mountains please submit an observation and let us know what you are seeing!

Get the most recent observations here.

This detailed snowpit illustrates my findings on a NE aspect at 11,200'.

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.

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