Bollettino valanghe

Moab

Utah Avalanche Center
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Pericolo valanghe

  • Alta quota
  • Limite del bosco
  • Sotto il limite del bosco
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Non aggiornato — questo bollettino è scaduto 3 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

A CONSIDERABLE avalanche danger remains on steep slopes facing W-N-E at all elevations. Deep and dangerous human triggered avalanches involving a buried persistent weak layer are likely in these areas.

A MODERATE avalanche danger exists on steep slopes facing SW-S-SE at all elevations. Human triggered avalanches failing on a buried persistent weak layer are possible.

A very weak, and unstable snowpack has developed and this situation is likely to be with us for awhile. Cultivate the mindset that avalanche terrain is off limits and keep your slope angles less than 30 degrees.

Problemi valanghivi

  • Persistent Slabs

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

    A slab of cohesive snow now exists above a persistent weak layer of faceted snow on all aspects and elevations. On northerly facing slopes, thick hard slabs of wind-drifted snow rest on top of this weak layer and they are hanging in the balance just waiting for a trigger. Once triggered, these avalanches will break deep and wide, and will be un-survivable. On southerly aspects stability tests also demonstrate slab failure with propagation. This is unusual for us. These avalanches are more stubborn to trigger, and won't be quite as large, but make no mistake, they are not to be trifled with. Avoidance of slopes steeper than 30 degrees is the only safe strategy right now.

    The video below illustrates unstable conditions with a slab failing on a weak layer on a SE aspect. An extended column test produced results of ECTP23.

Special Announcement

Road Conditions: The Geyser Pass Road will be closed for plowing this morning.

Grooming: LUNA rolled out Gold Basin through Geyser Pass yesterday.

A huge shout out to those who participated in our Backcountry 101 class! And thanks to Moab Gear Trader for their generous sponsorship!

Recent Activity

Reports of natural activity continue to trickle in. Natural slides likely occurred last Sunday or Monday. The photo below from Sam Van Wetter shows an avalanche on a due north aspect at a fairly low elevation of around 10,400'. From the looks of it, it failed on the December Drought layer before stepping down to weak facets near the ground. Avalanches such as this remain primed for a human trigger.

Snow and Weather

6:00 a.m. Snow and Weather Data

24 Hour Snow 5" 72 Hour Snow 7" Season Total Snow 88" Base Depth at Gold Basin 41"

Winds on Pre-Laurel Peak: S 5-15 Temp 26˚ F

Weather

We remain under the influence of southwest flow and a broad low pressure system moving to the east. Today look for light snow showers, primarily this morning, with 2"-4" possible. Winds from the SW will be light, and high temps at 10,000' will be in the upper 20's.

General Conditions

The storm yesterday over delivered and we received 6" of fairly dense new snow at 0.8" of Snow Water Equivalent (SWE). The new snow fell without wind and conditions should be great today. Although 0.8 SWE isn't a lot of weight, it's yet another incremental load on our fragile snowpack. We have a widespread persistent weak layer with an over-riding slab on all aspects and elevations. Collapsing or whumphing is becoming less widespread but it is still happening. This red flag sign of instability is the slab failing under a person's weight. The danger is greatest on steep, wind loaded, northerly aspects right around treeline, but avoiding slopes steeper than 30 degrees on all aspects remains the only guaranteed safe strategy right now.

Check out this video where Backcountry 101 students got to experience first hand the signs of an unstable snowpack:

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

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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.

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