Boletín de aludes

Logan

Utah Avalanche Center
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Peligro de aludes

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  • Límite del bosque
  • Bajo el límite del bosque
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Desactualizado: este boletín caducó 7 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Heightened avalanche conditions exist in the backcountry, the danger is MODERATE, and human triggered avalanches are possible on many drifted upper and mid elevation slopes.

  • Evaluate snow and terrain carefully.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    3

    Human triggered avalanches involving wind drifted snow are possible today, and some could be hard, large, and destructive.

    • Watch for and avoid stiffer drifted snow near ridge lines and in and around terrain features like cliff bands, scoops, gully walls, and sub-ridges.
    • Wind slabs are often rounded and chalky looking, and they might sound hollow, like a drum.
    • Soft fresh wind slabs can be quite sensitive, and are often remotely triggered. Hard wind slabs can be more devious, sometime allowing one to get out on them before releasing.
    • Avoid forming ridge top cornices, which can break much further back than expected and start avalanches on slopes below.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    3

    Human triggered avalanches failing on a newly buried persistent weak layer are possible on slopes steeper than about 30 degrees at upper and mid elevations. The cold weather last week created sugary weak surface snow in many areas, and some slopes were plagued by feathery surface hoar. Some of today's avalanches might be triggered remotely, from a distance or below. Some slopes may stay unstable for a while.

    Persistent weak layers consisting of feathery surface hoar and sugary near surface facets were buried by the New Years Storm on many slopes, and some of these may stay unstable for a while.

    The sugary October persistent weak layer near the ground on northerly facing upper elevation slopes appears to be dormant for now, but it could be reactivated in some places by a new load of wind drifted snow. Dangerous hard slab avalanches might be triggered by smaller avalanches of wind drifted snow overrunning slopes with poor snow structure. It's unlikely that a person could trigger an avalanche on the Halloween weak layer these days because the snow above it is so deep and hard. No avalanches failing on this layer have occurred in the Logan Zone since the mid-December natural cycle, but the sugary faceted grains are still quite loose and weak on shady sloopes. If one was to hit a slope in the right place, a "sweet spot", like a thinner part of a the slab, or perhaps a steep rocky area or a convexity with thin snow cover, a large deep slab avalanche could be triggered.

General Announcements

Thanks to the generous support of our Utah ski resorts and Ski Utah, we have discount lift tickets available. All proceeds from these go towards paying for avalanche forecasting and education! Get your tickets HERE.

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Remember your information can save lives. If you see anything we should know about, please help us out by submitting snow and avalanche observations....HERE. You can also call us at 801-524-5304, email by clicking HERE, or include #utavy in your tweet or Instagram.

This forecast is from the USDA Forest Service, which is solely responsible for its content. The forecast describes general avalanche conditions and local variations always occur.

I will update this forecast before about 7:30 tomorrow morning.

Recent Activity

We could see blown-in evidence of some natural new snow avalanche activity on the east facing avalanche paths in the Wellsville Range and on steep slopes in the Tony Grove Lake Area.

Snow and Weather

It's 23°F at the 8400' Tony Grove Snotel this morning, and there is 53 inches of total snow, with 110% of average SWE for the date. It's 27°F on Logan Peak, and south-southwest winds picked up overnight and are currently blowing a bit over 30 mph. Strong westerly winds and rime ice really messed with the nice powder at upper elevations and on exposed slopes. We found challenging riding and skiing yesterday in the Tony Grove Area, with nicer snow in sheltered terrain, in forested areas, and at lower elevations. Heightened avalanche conditions exist on drifted upper and mid elevation slopes, and people could trigger serious avalanches in the backcountry today.

Sastrugi wave patterns caused by strong west winds stripping the snow off this nice northeast facing slope near Tony Grove Lake.

The winds increased and veered from the south-southwest early this morning. It will be mostly cloudy in the mountains today with a bit of snow possible this afternoon. Expect 8500' high temperatures around 31°F and southwest wind 14 to 24 mph. Snow showers will continue into the evening, and it will be partly cloudy tonight, with low temperatures expected to be around 12°F and 10 to 20 mph west winds. Snow is expected tomorrow afternoon, with 2 to 4 inches possible by evening. Expect high temperatures around 25°F, and southwest wind 11 to 17 mph. Snow is expected Sunday night, with 6 to 12 inches possible by Monday morning.

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