Forecast for the Logan Area Mountains

Toby Weed
Issued by Toby Weed for
Monday, February 11, 2013

There is a MODERATE (level 2) danger in the backcountry. Heightened avalanche conditions exist, and you might trigger large unmanageable and potentially deadly avalanches on isolated slopes. East-northeast winds overnight drifted the light snow into rather unusual areas, and shallow, mostly manageable wind slab avalanches are likely in drifted upper elevation terrain. So too are triggered dry loose sluffs involving the fresh snow in steep terrain. Evaluate the snow and terrain carefully, use safe travel protocols, and continue to make conservative decisions regarding your route...

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Moderate
Considerable
High
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Weather and Snow

You'll find nice fast shallow powder conditions in the backcountry today. The Tony Grove Snotel at 8400' reports 3 inches of new snow in the last 24 hours. It's 8 degrees, there is 60 inches of total snow, and 65% of average water content for the date. It's only 3 degrees at the CSI Logan Peak weather station, and winds were out of the east-northeast overnight, with wind speeds averaging in the lower teens. This is enough for drifting to occur with the weekend's light snow, especially near the ridge-tops. The easterly component in the wind direction is somewhat unusual, meaning you might find fresh wind slabs in rather unexpected areas.

Recent Avalanches

We'll be looking into yesterday's rather strange accident in Broad's Fork of Little Cottonwood Canyon above Salt Lake City. A party of skiers appears to have been hit from far above by a large avalanche, that buried one person up to his neck and injured his leg (likely broken). The rest of his party was able to extricate him from the avalanche debris and help him down. The rescue helicopter was unable to land and assist due to inclement weather.

No new avalanches were reported in the Logan Area Mountains over the weekend.

Here's a link to our updated Avalanche List.

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Avalanche Problem #1
New Snow
Type
Location
Likelihood
Size
Description

A new load from last weekend's storm might reactivate the now deeply buried early January weak layer in some areas. Avalanches might fail 2 to 4 feet deep on weak faceted snow created during the drawn-out January high pressure systems. The danger is pockety, meaning many slopes are fairly stable, but slopes with unstable snow exist and are interspersed. You might trigger a dangerous avalanche on a slope right next to one that is already all tracked up You could trigger avalanches in some areas remotely, from a distance or worse, from below. Audible collapsing or whumpfing, recent avalanches, and cracking are red flags indicating instability.

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

Shallow fresh wind slabs formed in exposed upper elevation terrain with last night's moderate east-northeast winds easily drifting the light snow from the weekend. These may be quite sensitive and should be mostly of the manageable variety today, but as usual it's best to avoid fresh drifts on steep slopes, and watch for potential wind slabs in and around terrain features like sub-ridges, gullies, and cliff bands. Drifts can appear chalky, rounded or bulging, and can sound hollow or drum-like. Continuing east and north winds today will continue to build and stiffen the developing wind slabs....

Avalanche Problem #3
Wet Snow
Type
Location
Likelihood
Size
Description

Generally manageable dry loose avalanches or sluffs involving the fresh snow are still possible on steep slopes. Be sure nobody is above or below you if you venture into steep terrain, and be mindful of potential terrain traps like gullies, cliffs, or trees below.

Additional Information

There is a chance for a bit of snowfall this morning before skies clear. Temperatures are expected to stay below 20 degrees at 8000', and east-northeast winds should diminish and become variable directionally this afternoon. Overnight temperatures will drop into the lower single digits, and expect northwest winds. Light snow is possible tomorrow afternoon and tomorrow night, but accumulations will be minimal. The rest of the work week will bring more light snow and cold temperatures, and the small weather systems should keep the inversion in check. Clearing and high pressure conditions will develop for 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.