Forecast for the Logan Area Mountains

Issued by Toby Weed for Wednesday, April 17, 2019 - 6:01am
Heightened avalanche conditions exist on upper elevation slopes this morning, and human triggered avalanches of dense wind drifted snow are possible. Rapid warming and strong sun will quickly create dangerous avalanche conditions and CONSIDERABLE danger in sunny terrain, with natural and human triggered wet avalanches becoming likely on steep slopes during the day.
Use extra caution in the backcountry. Evaluate snow and terrain carefully, and make conservative decisions.
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Weather and Snow
The Tony Grove Snotel at 8400' reports about a foot of heavy new snow with 2.8" SWE in the last three days. There's 90 inches of total snow, and it's 24ºF this morning. I'm reading 19ºF at the 9700' CSI Logan Peak weather station, and northwest winds are currently averaging around 17 mph.
Here is a short video from Utah Avalanche Center Staff about Spring snow.

Strong high pressure aloft will build into the region beginning today, and continuing through the remainder of the week. This will bring a warming and drying trend to the area.
It will be mostly sunny today in the mountains, with high temperatures at 9000' expected to be around 39ºF and 11 to 16 mph north-northwest wind. It will be mostly clear tonight with low temperatures around 26ºF, and 14 to 20 mph west-northwest winds. Tomorrow will be sunny, with high temperatures of around 46ºF and 8 to 14 mph northwest wind.
Recent Avalanches
During periods of clearing in the past couple days we could see evidence of fresh natural wet avalanche activity in the Mount Naomi Wilderness and in the Logan Peak Area from Cache Valley.
Numerous fairly large natural wet loose and a few wet slab avalanches occurred in the first half of April across the Logan Zone.
Avalanche Problem #1
Wet Snow
Rapid seasonal daytime warming and strong April sun will cause increasing danger of wet avalanches entraining saturated dense new snow. Natural and human triggered wet avalanches will become likely in steep sunny terrain, especially on upper and mid elevation slopes that received a fair amount of wet snow in the past few days facing the southern half of the compass.
  • Avoid being on or under steep slopes with melt-softened saturated snow, and stay out of runout gullies.
Avalanche Problem #2
Wind Drifted Snow
Around a foot of heavy new snow fell at upper elevations in the last few days, and sustained and fairly strong westerly winds drifted it on steep slopes and into avalanche starting zones. Human triggered avalanches of dense wind drifted snow, 1 to 2 feet deep, are possible on upper elevation slopes. Avalanches might be a bit stubborn to trigger today, but some could run fast and far.
  • Avoid stiffer freshly drifted snow on the lee side of major ridges and in and around terrain features like cliff bands, gullies, tree stringers, scoops, and sub-ridges.
  • Stay off and out from under large ridge top cornices, which are likely to break further back than expected, and could trigger avalanches on steep slopes below.
Additional Information
I will update this forecast by 7:30 Friday morning. We will continue to post intermittent and weekend updates through April.
Spring snow in the Logan Zone...
General Announcements
Check out and use the new Avalanche Beacon Training Park we set up at the Franklin Basin trailhead. Special thanks to Northstars Ultimate Outdoors, USU Outdoor Program, and Beaver Mountain Ski Patrol for helping us to make this possible.
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This forecast is from the U.S.D.A. Forest Service, which is solely responsible for its content. The forecast describes general avalanche conditions and local variations always occur.

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