Boletín de aludes

Logan

Utah Avalanche Center
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Peligro de aludes

  • Alta montaña
  • Límite del bosque
  • Bajo el límite del bosque
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Desactualizado: este boletín caducó 8 months ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

CONSIDERABLE: People are most likely to trigger avalanches in drifted upper-elevation terrain. Heightened avalanche conditions already exist on drifted slopes steeper than 30 degrees in high and mid-elevation terrain, and heavy snowfall and drifting will elevate avalanche danger in the backcountry today and tonight.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    2

    People could trigger wind slab avalanches today, especially in exposed terrain at upper elevations and on drifted mid-elevation slopes facing the northwest through southeast. Wind slab avalanches up to 3 feet thick might fail on a preexisting layer of weak surface snow.

    • Avoid travel on and under steep slopes with thick and/or stiff deposits of recently wind-drifted snow.
    • Cracking is an obvious sign of instability.
    • Soft wind slabs of drifted new snow might be quite sensitive to human triggering, while hard, older wind slabs can be devious, sometimes allowing people to get well out on them before releasing suddenly, like a mousetrap.

    Read my Blog about Wind, Drifting, and Avalanches

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    4

    There is lingering potential on some isolated slopes with poor snow structure for large and destructive hard slab avalanches that fail on a buried persistent weak layer near the ground.

    • We are still concerned by a buried persistent weak layer problem that likely still exists in outlying upper-elevation terrain, especially on northerly facing slopes in the southern half of the zone. A weak layer of moist faceted November snow lurks near the ground. Destructive, hard slab avalanches up to 4 feet deep remain possible in isolated drifted terrain.
    • Another potential buried persistent weak layer consisting of glittery surface hoar and/or small sugary grains of faceted snow may exist on last year's snow surface. Buried by the New Year's storm, it could have been preserved intact on some slopes. Slab avalanches today, up to three feet thick, could fail on a persistent weak layer in the Christmas-New Year's interface.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2

    The danger of soft slab and loose avalanches of storm snow will increase as new snow rapidly stacks up on steep slopes this afternoon and overnight.

    • Natural loose and soft slab avalanches of storm snow are increasingly possible, especially likely during periods of very heavy snowfall.
    • People should stay off and out from under steep slopes as new snow rapidly accumulates and is drifted onto them.

Recent Activity

An observer reports triggering a sizable wind slab avalanche yesterday by dropping a cornice on a drifted slope in the Strawberry area near Emigration Summit in the Northern Bear River Range. For all observations and avalanche activity in the Logan Zone, go HERE.

Snow and Weather

The considerable danger level (3 on a scale of 5) indicates that avalanche conditions are dangerous, and careful snowpack evaluation, cautious route-finding, and conservative decision-making are crucial for safe backcountry travel. Today's avalanche problems on slopes steeper than 30 degrees in the Logan Zone include soft and stiffer wind slab avalanches, soft slab and loose avalanches of new snow, and isolated deep slab avalanches failing on a sugary persistent weak layer buried up to 4 feet deep near the ground.

Light snowfall is starting in the mountains, visible on the Beav's webcams this morning. The Tony Grove Snotel at 8400 feet reports 27°F and 62 inches of total snow. At the UAC Card Canyon weather station at 8700 feet, it's 23°F, with 45 inches of total snow. Currently at 9700 feet on Logan Peak, it's 20°F, the wind is blowing 22 to 25 mph from the west-southwest, gusting to 49 mph early this morning.

The National Weather Service has issued a Winter Weather Advisory for the Logan Zone from this morning through tomorrow. It will snow in the mountains today and snowfall could be heavy at times, with a high temperature at 8500 feet near 26°F and 8 to 12 inches of accumulation possible in favored upper elevation terrain. Winds from the west-southwest will blow 15 to 20 mph, with higher gusts. Expect continuing periods of heavy snowfall tonight, with a low temperature of around 16°F and 7 to 11 inches possible. Snowfall should taper off on Thursday, with continued moderately strong winds from the west-northwest and temperatures dropping around 13°F.

Additional Info

Use safe travel practices: travel with a partner, and cross or ride steep slopes one at a time while the rest of your group watches from a safe spot.

Are you interested in learning more about avalanches? Visit our education page for details on all our classes.

For more information, visit the UAC weather page here: UAC Weather Page For Logan-specific weather, go here: Logan Mountain Weather

-For all questions on forecasts, education, Know Before You Go, events, online purchases, or fundraising, call 801-365-5522.

-Remember, the information you provide could save lives, especially if you see or trigger an avalanche. To report an avalanche or submit an observation from the backcountry, go HERE

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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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This information does not apply to developed ski areas or highways where avalanche control is normally done. 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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