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Forecast for the Logan Area Mountains

Toby Weed
Issued by Toby Weed on
Tuesday morning, January 26, 2021
DANGEROUS HUMAN TRIGGERED AVALANCHES ARE POSSIBLE! Elevated avalanche conditions exist and there is MODERATE danger on steep slopes in the Bear River Range. People could trigger soft slab avalanches where fresh snow has been drifted, and more dangerous avalanches involving old snow failing on a sugary buried persistent weak layer near the ground. You'll find safer conditions in sheltered lower angled and lower elevation terrain.
Areas with more dangerous conditions and less stable snow exist in the Logan Peak Area and the Wellsville Range.
  • Evaluate snow and terrain carefully.
  • Stay off and out from under drifted slopes steeper than about 30 degrees.
Low
Moderate
Considerable
High
Extreme
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Weather and Snow
We've found nice shallow powder riding and skiing conditions at upper elevations in the Bear River Range in the past couple days. Several inches of new snow fell in the mountains across the zone Saturday and winds up until last night were fairly light, even at upper elevations. The new snow wasn't enough to change the avalanche danger much, people could trigger dangerous avalanches failing on a widespread buried persistent weak layer, and elevated avalanche conditions exist on steep slopes at all elevations.
The 8400' Tony Grove Lake Snotel reports only 60% of normal SWE for the date, and the existing snowpack is generally quite shallow in the Logan Zone. We went up on Red Pine Ridge yesterday and found that the snow is exceptionally shallow, weak, and perhaps unstable on steep slopes in the terrain around Logan Peak. The rocky approach up Providence Canyon and the shallow loose snow have kept traffic in the area pretty light and riders have been staying mostly in the flats and meadows. We recommend that people continue to avoid and stay out from under slopes steeper than about 30 degrees, and stay well clear of the obvious and historic avalanche paths in the area for a while.

Today will be cloudy, with a good chance for some snow showers this afternoon. Expect 8500' high temperatures around 18°F, a moderate southeast breeze veering from the southwest in the afternoon, and wind chill values as low as -12°F. More snow is likely this week in a progressive weather pattern, with intensifying south-southwest winds tomorrow and up to about 6 inches of accumulation possible in warm air advection Wednesday night and Thursday.
Recent Avalanches
It was an active weekend and active again yesterday in the Wasatch Range, with numerous human triggered avalanches reported. Visit our avalanche list HERE
Observers over the weekend reported a few natural and triggered shallow soft slab and loose avalanches of new snow in the Bear River Range, and yesterday we observed from a distance some natural activity involving new snow in the Adams Corral Area. There was one report of a small remotely triggered avalanche that involved old snow in the Peter Sinks area Sunday. It stepped down to into the faceted snow from December.
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Avalanche Problem #1
Persistent Weak Layer
Type
Location
Likelihood
Size
Description
Very weak sugary or faceted snow near the ground is widespread across the region, and people could trigger avalanches where a slab of more cohesive snow has formed on top of the weak snow. A small avalanche overrunning a slope with poor snow structure could cause a larger, more dangerous avalanche. The load of the new snow may be enough in some areas to overload deeper buried persistent weak layers that are widespread across the zone, and large avalanches could result.
  • Avalanches failing on a buried persistent weak layer might be triggered remotely, from a distance, or worse from below!
  • Cracking and collapsing of the snow are a red flag, indicating unstable snow conditions.
An observer sent in this picture of a long shooting crack that was accompanied by an audible collapse that occurred in low angled terrain in the Garden City Bowls Area yesterday.
These large faceted snow grains make up a nastyburied persistent weak layer that is widespread in the Logan Zone. It is especially prevalent in the Logan Peak Area.
Avalanche Problem #2
Wind Drifted Snow
Type
Location
Likelihood
Size
Description
An overnight increase in southeast and east winds could be enough to drift light fresh snow into lee slope avalanche starting zones, cross-load and build drifts high on steep slopes, perhaps in unusual or unexpected places. Drifting may have created more cohesive slabs of the light surface snow, and soft slab avalanches are possible for people to trigger on steep drifted slopes at upper elevations.
  • Watch for and avoid drifted snow at upper and mid elevations near ridge tops and in and around terrain features like gullies, scoops, cliff bands, and sub ridges.
Additional Information
Do you have the essential avalanche rescue gear (transceiver, probe, and shovel) and do you know how to use them? Watch this video to see how the three pieces of equipment work together. HERE
This video is from the 1-8-2021 avalanche in Steep Hollow that completely buried a local snow bike rider.

Please use the Beacon Training Park and Beacon Checker at the Franklin Basin Trailhead...
General Announcements
Thanks to the generous support of our local resorts, Ski Utah, and Backcountry, discount lift tickets are now available. Support the UAC while you ski at the resorts this season. Tickets are available here.
Visit this website with information about Responsible Winter Recreation by the Utah Office of Outdoor Recreation.
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Remember your information can save lives. If you see anything we should know about, please help us out by submitting snow and avalanche observations....HERE. You can also call us at 801-524-5304, email by clicking HERE, or include #utavy in your tweet or Instagram.
I will update this forecast by around 7:30 tomorrow morning.
This forecast is from the USDA Forest Service, which is solely responsible for its content. The forecast describes general avalanche conditions and local variations always occur.