Logan Avalanche Advisory

Forecaster: Toby Weed


Dangerous avalanche conditions are occuring or are imminent. Backcountry travel in avalanche terrain is not recommended.

An Avalanche Warning remains in effect for the Wasatch Mountains north of I-80 to include the Bear River Range. Those without significant avalanche experience should avoid being on or underneath steep slopes today.


Danger by aspect and elevation on slopes approaching 35° or steeper.
(click HERE for tomorrow's danger rating)

Danger Rose Tutorial

Yesterday's heavy snow and sustained winds created a HIGH danger in the backcountry, and very dangerous conditions still exist on many slopes today. Dangerous persistent slabs, releasing on buried weak layers are likely on slopes steeper than around 35 degrees, especially on generally sheltered mid-elevation slopes facing the northern half of the compass. You are likely to trigger soft slabs, wind slabs, and loose snow avalanches involving significant quantities of new snow on steep slopes at any elevation. Avoid huge and deceptive overhanging cornices, which may break further back than you expect.

Travel in avalanche terrain is not recommended.........


Perhaps the most substantial storm of the season dropped 28 inches of snow on the Tony Grove depth sensor with 2 inches of water in the last 24 hrs, and there's now 104 inches of total snow on the ground at 8400'. The Campbell Scientific weather station on Logan Peak recorded moderate yet sustained west-southwest winds yesterday, which switched around from the northwest and diminished overnight.

Rapid significant accumulations of heavy snow and moderately strong west winds at all elevations yesterday raised the ante in the backcountry. If you had plans for a big day in the mountains, you should reconsider and reevaluate….Numerous Red Flags are waving in front of our faces today even before we step out of the door, and very dangerous avalanche conditions exist.


In addition to heavy snowfall and wind, which are obvious clues in themselves, I received reports from the backcountry of a few other Red Flag indicators of instability. A couple parties reported deep shooting cracks and heart stopping audible collapses or whoomphing noises in normally shady terrain where we might expect to find a weak layer consisting of preserved surface hoar. Fresh avalanche debris was observed above highway 89 in terrain accessible from Beaver Mountain, and evidence of natural activity spawned by yesterday’s storm will come into view with clearing…

Snow safety crews in the Ogden Mountains and the Central Wasatch Range report numerous intentionally triggered avalanches yesterday…….


      Over the next 24 hours.

The preserved surface hoar layer that was buried back on February 6th may become reactive; with significant new loading of heavy wet snow at lower and especially mid elevations.....This layer only exists on generally sheltered slopes facing the northern 3/8s of the compass.Slab avalanches stepping down to this layer will be in the 2 to 3 feet deep range and may involve broad sections of a slope or entire bowls.


      Over the next 24 hours.

Winds diminished with the last several inches of snowfall and widespread wind slabs built yesterday may not be so obvious...Expect these spread over broad lee slope deposition areas and not just limited to ridge-top environs, as heavy snowfall occurred in conjunction with moderately strong winds. Significant loose avalanches and sizable soft slabs consisting of yesterday's fresh snow and failing on Monday's interface or on short-lived weak density-change layers within the new snow are likely on many slopes steeper than about 30 degrees today.


      Over the next 24 hours.

Beware the huge and overhanging cornices on the major ridge-lines. These are likely to break further back than you might expect and could easily trigger slab avalanches on lee slopes below......


We see some lingering snow showers in the mountains today, which will gradually diminish.

Expect clearing tomorrow as a high pressure system sets up for the weekend....


You can get a great deal on further discounted tickets to Beaver Mountain and support the Utah Avalanche Center at the same time. 100% of the funds raised from these donated lift tickets will go to the Friends of the Utah Avalanche Center and will help our financially strapped but important program...(Click HERE to get discounted tickets on-line)

The Friends of the Utah Avalanche Center and the USU Outdoor Recreation Center are offering a four-day intensive advanced backcountry avalanche Level 2 (certification) class next weekend. The class starts on Thursday evening (2/19/09), and we'll spend the next 3 days in the field. Please call the ORC to register in advance. (435-797-3264)

Our "Know before You Go" video is available online..... (click HERE to watch it)

The UAC depends on contributions from users like you to support our work. To find out more about how you can support our efforts to continue providing the avalanche forecasting and education that you expect please visit our Friends page.

Your snow and avalanche observations help everyone in the backcountry community. Please let us know what you're seeing by leaving a message at (435-)755-3638 or 1-800-662-4140, or email us at uac@utahavalanchecenter.org. .

This advisory is from the U.S.D.A. Forest Service, which is solely responsible for its content. This advisory describes general avalanche conditions and local variations always occur.

I will update this advisory by around 7:30 Friday morning.

This information does not apply to developed ski areas or highways where avalanche control is normally done.  This advisory is from the U.S.D.A. Forest Service, which is solely responsible for its content. This advisory describes general avalanche conditions and local variations always occur.

This advisory provided by the USDA Forest Service, in partnership with:

The Friends of the Utah Avalanche Center, Utah Division of State Parks and Recreation, Utah Division of Emergency Management, Salt Lake County, Salt Lake Unified Fire Authority and the friends of the La Sal Avalanche Center. See our Sponsors Page for a complete list.