Forecast for the Logan Area Mountains

Toby Weed
Issued by Toby Weed for
Wednesday, January 30, 2013

Dangerous avalanche conditions exist, and there is a CONSIDERABLE (or level 3) avalanche danger on many steep slopes in the backcountry, with triggered avalanches likely on drifted slopes. Heavy snowfall and strong westerly winds overloading slopes with poor snow structure created a HIGH (level 4) danger in some drifted terrain. Dangerous natural and human triggered avalanches are likely today in these areas, especially on drifted slopes. Natural storm snow avalanches involving light new snow are likely in areas with significant new accumulations. Careful snowpack evaluation, cautious route-finding, and conservative decision making will be essential in the backcountry today, and travel in avalanche terrain is not advised.

Low
Moderate
Considerable
High
Extreme
Learn how to read the forecast here
Special Avalanche Bulletin
THE CURRENT STORM HAS LED TO DANGEROUS AVALANCHE CONDITIONS IN STEEP TERRAIN. THIS INCLUDES MOUNTAIN
 VALLEYS THAT HAVE RECEIVED THE MOST SNOW. NATURAL AND HUMAN TRIGGERED AVALANCHES ARE LIKELY.
Weather and Snow

The Tony Grove Snotel at 8400' reports several inches of new snow in the last 24 hours, containing 7/10ths of an inch of water. It's 18 degrees, there is 63 inches of total snow, and 69% of average water content for the date. It's 17 degrees at the UDOT Hwy 89 weather station, with recorded hourly average wind speeds in the mid twenties and gusts in the upper 30s from the northwest. It's 12 degrees at the 9700' summit of Logan Peak and the wind sensor is rimed or buried in fresh snow. You'll find deep light powder in some areas, potentially dangerous avalanche conditions on many slopes, and a still rising danger with more snow and wind on the way today.

Recent Avalanches

Locally; I noticed widespread natural storm snow and small soft slab activity yesterday in Providence Canyon, and it looked like some of the big east facing avalanche paths in the Wellsville Range might have run naturally as well, but I couldn't confirm this due to poor visibility. I certainly couldn't see a thing in the Bear River Range, and i received no reports from the backcountry....

Here's a link to our updated avalanche list...

Ad
Avalanche Problem #1
New Snow
Type
Location
Likelihood
Size
Description

Avalanches will likely fail 1 to 2 feet deep on very weak faceted snow created during the drawn-out January high pressure systems. Areas plagued by the shallowly buried January 8 rime-crust , which is intact and fairly widespread in the region, and weak faceted snow associated with it are most suspect. The preexisting snow on shady mid elevation slopes is especially weak, and avalanches could occur in unexpected areas on slopes approaching or steeper than 35 degrees. Natural avalanches are possible today, especially during periods of heavy snowfall. In these conditions, you could trigger avalanches remotely, from a distance or worse, from below. Recent avalanches, audible collapsing, and cracking are red flags indicating instability...

Avalanche Problem #2
Persistent Weak Layer
Type
Location
Likelihood
Size
Description

Triggered wind slab avalanches are likely on drifted upper and mid elevation slopes, and naturals are possible.. Watch for and avoid stiffer fresh wind slabs on the lee side of major ridges and in and around terrain features like cliff bands, sub-ridges, gullies, and scoops. Potential wind slabs are drifts that often appear smooth or rounded and chalky looking, and they sometimes sound rather hollow.

Avalanche Problem #3
New Snow
Type
Location
Likelihood
Size
Description

Storm snow avalanches consisting of very soft slabs and loose snow are likely to continue to be an issue in areas that picked up significant accumulations of light snow yesterday, and in areas that receive more today. Natural avalanches are possible. Avoid steep slopes with trees or other terrain traps below, and stay out from under obvious or historic avalanche paths....

Additional Information

The National Weather Service has continued a Winter Storm Warning for the mountains in our area through early Thursday morning. Expect heavy snowfall and drifting snow in the mountains today, with several inches of accumulation possible by evening and continuing fairly strong west winds with gusts approaching 40 mph. High temperatures in the mountains will be in the mid twenties. Expect several more inches of accumulation overnight and slightly diminished northwest winds. High pressure conditions are expected to return to the region late in the week, and will set up over the area over the weekend.

Check out the new Logan Mountain Weather page...

General Announcements

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.