Forecast for the Logan Area Mountains

Toby Weed
Issued by Toby Weed for
Saturday, January 19, 2013

Although the snow is mostly stable in many areas, triggered avalanches are possible and there is a MODERATE (or level 2) danger in the backcountry today. Heightened avalanche conditions exist in drifted terrain at all elevations, and you could trigger wind slab avalanches up to around a foot deep, perhaps deeper in places. Loose wet avalanches are possible in sunny terrain with saturated surface snow, as are loose dry sluffs on steep slopes in sheltered shady terrain. As usual, safer conditions exist in sheltered and lower angled areas. Evaluate the snow and terrain carefully, avoid steep drifted or sun-warmed slopes and terrain traps below, and continue to practice safe travel protocols...

Low
Moderate
Considerable
High
Extreme
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Weather and Snow

The Tony Grove Snotel at 8400' reports 26 degrees this morning, there is 45 inches of total snow, and 66% of average water content for the date. The 9700' CSI Logan Peak weather station reports 24 degrees and northwest winds averaging over 20 mph and gusts near 40. It'll be another great day to get up into the mountains for some fresh air, balmy temperatures, and plenty of sunshine. You can still find some nice smooth re-crystallized powder in sheltered terrain and the fast snow makes lower angled slopes fun. In most areas you can still feel a rime crust from last week under a few or several inches of softer snow. Upper elevation terrain exposed to north winds is wind damaged and sunny slopes are undergoing daily melt and refreeze cycles.

Recent Avalanches

No new avalanches were reported locally since the storm last Friday. (1-11)

Craig Gordon is heading up to the site of yesterday's tragic accident in the Western Uintas east of Kamas, in which two young riders were buried and killed. We'll post his findings and the specifics of the deadly avalanche as soon as we can.

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

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Avalanche Problem #1
Persistent Weak Layer
Type
Location
Likelihood
Size
Description

Old and fresher wind slabs around a foot deep are unlikely in most areas, but still possible at all elevations on drifted slopes. Drifts formed on weak sugary faceted surface snow, in many areas capped by a rime crust from January 8th. The very weak and well preserved faceted snow from early January is a persistent weak layer that may haunt us for some time to come. The snow is especially weak at lower and mid elevations and where the snowpack is generally shallow, but. in most areas a slab layer consisting of harder snow above the weakness is lacking. Watch out for old and forming wind slabs on the lee side of major ridges and in and around terrain features like cliff bands, sub-ridges, gullies, and scoops. Avoid stiff drifts on steep slopes, which often appear smooth or rounded and chalky looking, and they sometimes sound rather hollow. Stiff hard slabs might allow you to get out on them before releasing. Cracking and audible collapsing are red flags.

Avalanche Problem #2
Wet Snow
Type
Location
Likelihood
Size
Description

It'll be downright toasty in the sun and solar radiation will be magnified in sheltered sunny bowl areas like in a solar oven. Melting will cause the snow surface to become saturated, and loose wet avalanches are possible on steep slopes. Natural wet avalanches are possible during the midday heat where loose snow falls from cliff bands or trees onto steep slope below. Loose wet avalanches are generally manageable from above, but you have to make sure nobody is below because they have the tendency to widen out in descent and might run further than expected. Loose dry sluffs are possible on some steep sheltered slopes with loose re-crystallized or faceted snow. Consider and avoid potential terrain traps like gullies or trees below steep slopes.

Additional Information

Expect sunny skies and warming temperatures in the mountains today. High temperatures will reach the upper 30s at 9000', and we'll feel a moderate northwesterly breeze. A strong high pressure system will remain over the region with significant warming aloft continuing today. The resulting temperature inversion will persist and cold air and smog will continue to be trapped in the valleys through the weekend and well into next week. We'll find fair weather in the mountains during this time. A weakening disturbance will graze Northern Utah next Wednesday night and Thursday, which might bring us a bit of relief from the smog, but little snow is expected...

Check out the new Logan Mountain Weather page...

General Announcements

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.