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

There is a MODERATE danger for triggering an avalanche failing on a buried persistent weak layer in steep terrain that faces NW-N-NE-E. An avalanche triggered on this layer can be 2-3 feet deep. On sunny slopes facing W-S-E the danger will rise to MODERATE for wet loose avalanches as the day warms up. Be on the lookout for signs of wet activity today.

Problèmes avalancheux

  • Persistent Slabs

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

    A persistent weak layer of dry, sugary faceted snow still exists on NW-N-NE-E aspects beneath a slab that is 2'-3' thick. The weakest snow exists right around treeline and this is the most likely zone for triggering an avalanche. Elsewhere, these avalanches are getting harder to trigger and there is some spatial variability associated with this weak layer. Some parties are still getting failures and propagation in snow pit tests, while others are not. One party even reported several large collapses on Saturday. This is the first report of collapsing in about two weeks and is a sign of our snowpack reacting to the near record warm temperatures over the past few days. We'll see above average temperatures again today and I'm going to continue to give this problem a wide berth for the time being.

  • Loose Wet

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

    Warm temperatures and morning sunshine will create the potential for wet avalanche activity on all slopes facing W-S-E. Increasing cloud cover today may keep wet activity in check. If you find yourself enjoying a corn cycle on solar aspects, then you need to be paying attention to signs of wet activity. If the slopes are getting wet, sloppy, and no longer support your weight, it's time to get off steep sunny terrain.

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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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Road Conditions: The road is a mix of dirt, mud, and patches of packed snow. It gets sloppier as the days warm up. All wheel drive and good tires are recommended.

Grooming: Trails have not been groomed.

Recent Activity

In my travels on Sunday, I observed numerous, loose wet avalanches, primarily at mid elevations on steep slopes facing W-S-E.

Snow and Weather

6:00 a.m. weather data:

24 Hour Snow 0" 72 Hour Snow 0" Base Depth at Gold Basin 51" Wind S 20-25 G35 Temp 38F

High clouds will be on the increase today ahead of the upper level system that will bring snowfall starting this evening. South winds will be ramping up ahead of the storm blowing in the 20-25 mph range with gusts up to 35 mph. We will have one more day of above average temperatures with highs in the low 40's. The incoming system will put an end to the heat wave and temperatures should drop to the low 20's tonight. Snow will continue Tuesday into Wednesday and I'm optimistic for an inch of water and maybe a foot of snow by Wednesday.

Snowpack

The low temperature in Gold Basin last night was 34 degrees. The snow pack most likely got a refreeze thanks to wet bulb temperatures that dipped below freezing for a solid 10 hours. (Wet bulb temperature is a relationship between the relative humidity and ambient air temperature). You will find supportable crusts today on solar aspects. Corn skiing may or may not develop depending on how quickly the clouds build with the incoming storm. If the corn cycle develops we will have to be on the lookout for wet avalanche activity later in the day as temperatures rise. Reports from the alpine yesterday are of grabby, wind affected snow on North facing slopes above treeline. There is still some soft, medium density snow to be had out of the wind zone. On slopes facing NW-N-NE-E, we still have a persistent weak layer of sugary faceted snow that formed during the Jan-Feb dry period. The weakest snow exists right around treeline on slopes with a northeasterly component.

Snow and Weather Links

Gold Basin SNOTEL site (10,000')

SNOTEL near Geyser Pass Trailhead (9600')

Storm Totals in Gold Basin

Wind Station on Pre Laurel Peak (11,700')

NWS Weather Forecast for the La Sal Mountains

Régions couvertes