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Advisory: Logan Area Mountains | Issued by Toby Weed for February 20, 2013 - 6:58am |
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![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Above 8,500 ft.
7,000-8,500 ft.
5,000-7,000 ft.
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bottom line There is a MODERATE (or level 2) danger in the backcountry. Heightened avalanche conditions exist, and you might trigger stiff wind slab avalanches or cornice falls in upper and mid elevation terrain exposed to recent drifting from south winds. Although rather unlikely, you might trigger larger and dangerous persistent slab avalanches on isolated or outlying slopes with poor snow structure and recent accumulations of drifted snow. Evaluate the snow and terrain carefully, and continue to use safe travel protocols,
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special announcement Go to http://www.backcountry.com/utah-avalanche-center to get tickets for Beaver Mountain. You won't save a ton of money, but all proceeds from sales of these tickets will benefit the Utah Avalanche Center, and It's super easy to do. |
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current conditions The Tony Grove Snotel at 8400' reports 22 degrees, and there is 56 inches of total snow containing 62% of average water content for the date. It's 17 degrees at the CSI Logan Peak weather station, and overnight southeast winds diminished from hourly average wind speeds in the mid-twenties, and are now averaging around 10 mph. You can still find some good fast shallow powder riding conditions in shady sheltered terrain, but supplies are limited. Hopefully a couple more inches of snow will fall today and freshen things up a bit. |
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recent activity There were a few natural and triggered wind slab avalanches yesterday in the backcountry of the Wasatch and Uinta Ranges, and a couple people took unintentional rides. No one was injured. No new avalanches were reported recently in the Logan Area Mountains. Here's a link to our updated Avalanche List.
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type | aspect/elevation | characteristics |
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![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Above 8,500 ft.
7,000-8,500 ft.
5,000-7,000 ft.
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description
Expect to find stiff wind slabs and treacherous cornices in upper elevation terrain exposed to drifting from the recent south and southeast winds. Avoid stiff wind deposited snow on steep slopes, and watch for potential wind slabs in and around terrain features like sub-ridges, gullies, and cliff bands. Wind slabs are drifts that can appear chalky, rounded or bulging, and can sound hollow or drum-like. Be cautious along the ridges, since cornices might break further back than expected, and cornice falls could trigger wind slab avalanches on slopes below. Hard wind slabs could break further up slope than expected and have a nasty habit of allowing you to get out on then before releasing.
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type | aspect/elevation | characteristics |
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![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Above 8,500 ft.
7,000-8,500 ft.
5,000-7,000 ft.
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description
Persistent slab avalanches might fail 1 to 2 feet deep on weak faceted snow created during high pressure conditions in January. I triggered a couple heart stopping whumpfs or audible collapses on Sunday at around 8400' in elevation on the west facing Franklin Basin side of Beaver Mountain. My tests were convincing and consistent, showing propagating failures of a developing slab on very weak sugary faceted grains. Steep, recently drifted, rocky, outlying upper and mid elevation slopes with generally shallow and weak snow cover and recent wind loads are the most suspect. Although the chances are slim, you might trigger dangerous persistent slab avalanches in some areas remotely, from a distance or worse, from below. As weight from new snow gradually builds up in the next several days, the currently dormant faceted snow may reawaken, and the danger of persistent slab avalanches will rise. Whumpfing and deep cracking are red flags indicating potential persistent slab instability.
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weather We'll see some snow today, with 9000' high temperatures around 26 degrees and a light and variable wind switching from the north this morning. 1 to 3 inches of accumulation are forecast by evening. A couple more inches are likely tonight under a continuing northwest flow. Most of this week's storm energy will pass to our south, but periods of light snow will continue through Friday, with a couple inches possible in each 12 hour forecast period. A larger and colder storm is expected over the weekend, with significant accumulations possible and potentially strong winds..... Check out the new Logan Mountain Weather page...
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general annoucements The infamous annual CROWBAR backcountry ski race is scheduled for Saturday, February 23 in Beaver Creek Canyon. Click HERE for more details... For a printer friendly version of this advisory click HERE Remember your information from the backcountry can save lives. If you see or trigger an avalanche, or see anything else we should know about, please send us your snow and avalanche observations. You can also call us at 801-524-5304 or email by clicking HERE. In the Logan Area you can contact Toby Weed directly at 435-757-7578. I will update this advisory on Monday, Wednesday, Friday, and Saturday mornings by around 7:30... This advisory is produced by the U.S.D.A. Forest Service, which is solely responsible for its content. It describes only general avalanche conditions and local variations always exist. |