Forecast for the Logan Area Mountains

Toby Weed
Issued by Toby Weed for
Saturday, December 15, 2018
MODERATE: Heightened avalanche conditions exist on drifted upper and mid-elevation slopes. You could trigger soft or stiffer slab avalanches involving wind drifted snow up to 18" deep. Although becoming unlikely, dangerous avalanches failing on a persistent weak layer near the ground remain possible on upper elevation north facing slopes.
You can find stable snow, LOW danger, and very nice powder in sheltered, lower angled, and lower elevation terrain. Evaluate snow and terrain carefully.
Low
Moderate
Considerable
High
Extreme
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Special Announcements
Check out the new free online avalanche course series developed by the Utah Avalanche Center. This is a great way to refresh your skills or prepare you for a Backcountry 101 or Level 1 class. HERE
Weather and Snow
South-southwest winds picked up overnight, drifting the soft snow from Wednesday at upper and mid elevations. It’ll be nice, sunny and warm in the mountains again today, and you’ll still be able find very nice powder conditions out of the wind. South facing slopes developed a thin sun-crust, but with the seasonally low sun angle, most slopes are staying nice and fluffy. The snow is still just a bit too shallow to ride in steep terrain or to get aggressive with your throttle. You have to keep your speed down, and I've heard a few stories of recent rock encounters.
The Tony Grove Snotel at 8400' reports 29º F and 36"of total snow, containing 96% of average SWE for the date. 10 inches of nice powder accumulated at the site on Wednesday. It's 21º F at the 9700' CSI Logan Peak weather station this morning where south-southwest winds are whistling along at 30 to 35 mph with a gust of 52 mph.
High pressure will rebound over the area this weekend before another weakening storm system arrives early next week. Strong high pressure aloft will settle across the region by the middle of the week. We'll see mostly sunny conditions today with high temperatures at 8500' around 34º F and 15 to 20 mph west-southwest wind. It'll be partly cloudy tonight with a low temperature around 18º F and 6 to 8 mph east wind. Tomorrow will be sunny with a high temperature near 40º F and 8 to 13 mph east wind.
Recent Avalanches
There was some natural avalanche activity due to wind drifted snow on steep upper elevation slopes in the central Bear River Range during the intense storm on Wednesday.
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Avalanche Problem #1
Wind Drifted Snow
Type
Location
Likelihood
Size
Description
Drifting from south and southwest winds occurred in exposed terrain overnight, and heightened avalanche conditions exist on upper and mid elevation slopes. You could trigger soft or stiff slabs consisting of wind drifted snow up to 18" deep.
  • Watch for and avoid fresh or older drifts on the lee sides of major ridges and in and around terrain features like cliff bands, scoops, gullies, stringers, and sub-ridges.
  • Avoid steep slopes that have a smooth, rounded appearance, or that sound hollow like a drum.
Avalanche Problem #2
Persistent Weak Layer
Type
Location
Likelihood
Size
Description
Avalanches failing on a persistent weak layer near the ground remain possible on upper elevation slopes with poor snow structure. Although rather unlikely, dangerous human triggered hard slab avalanches are still possible.
  • Collapsing and cracking indicate that the snow is unstable.
  • Avoid steep shady or rocky terrain at upper elevations.
General Announcements
The new UAC IOS mobile app is now available on the app store. Check out the new "My Weather" feature. HERE
Check out the new free online avalanche course series developed by the Utah Avalanche Center. This is a great way to refresh your skills or prepare you for a Backcountry 101 or Level 1 class. HERE
Now is a great time to practice companion rescue techniques with your backcountry partners. Here is our practice video.
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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.