Avalanche forecast

Logan

Issued Dec 9, 2025valid to Dec 10, 2025Utah Avalanche Center

Avalanche danger

Alpine
Treeline
Below treeline

Out of date — this forecast expired 9 months ago. You’re viewing past conditions, not the current bulletin.

Highlights

Heightened avalanche conditions exist in upper and mid-elevation terrain. The danger is MODERATE, and people could trigger dangerous avalanches failing up to 2 feet deep on a buried persistent weak layer. Areas with CONSIDERABLE danger may be found on northerly facing upper-elevation slopes steeper than 30 degrees, where the wind previously drifted snow. Rain on snow could cause potential for wet avalanches.

Avalanche problems

Persistent Slabs
N
NE
E
SE
S
SW
W
NW
Alpine
Treeline
Below treeline
Likelihood
Likely
Size
2
Weak, rotten snow from this fall is buried by a slab of heavy, dense storm snow about a foot deep. In the places where this old snow existed before the storm—on north facing slopes at mid-elevations (7500-8500 feet), and on all aspects at upper elevations (8500+ feet)—there is potential to trigger widely propagating avalanches large enough to bury a person. Avalanches might be triggered remotely from below, or from a distance.

These slides will be at their largest (more than 2 feet deep) in areas where the wind has drifted snow, near ridgelines and mid-slope catchment areas like gullies.

Keep an eye out on mid-elevations in wind-exposed areas, where Toby and I found natural slides in the Tony Grove area on Sunday that were large enough to bury a person.

Even a small avalanche could be dangerous in these shallow snow conditions, as you might be dragged through the rocks or down trees below.

Follow safe travel protocols: travel with a partner, cross (or ride) steep slopes one person at a time while the rest of your party watches from a safer place.

December 7, 2025: Buried Persistent Weak Layer—An Obvious Problem!

Recent Activity

A rider reported triggering a 2 foot deep avalanche, depositing 6 feet deep debris, on a NE-facing slope near 9000 feet on Sunday while riding near Doubletop Mountain. The slide broke on weak, old faceted snow that was buried during this weekend's storm. His full observation is HERE.

***For all observations and avalanche activity in the Logan Zone, go HERE

Snow and Weather

This morning, it's 25° F at the Tony Grove Snotel at 8400 feet, with 26 inches of snow that's continuing to settle after this weekend's storm. Overnight, moderate winds were sustained, shifting from the northwest to southwest while gusting into the mid-50s mph. Overnight mountain lows hit 21°F on Paris Peak, and highs reached 36°F on Logan Summit.

Over the weekend, the wet, warm, and windy storm 12/5-12/6 dropped 2.8 inches of water and about a foot of dense, heavy snow on top of an already weak, faceted snowpack from this fall. This strong over weak snowpack structure is responsible for many natural avalanches that were large enough to bury a person, as well as too many other red flags—like whumfing and shooting cracks—to count since Friday.

Today through tomorrow, wind and rain are mostly on the menu for the Logan zone. An atmospheric river makes its way over the PNW through to Montana and Northern Idaho. A building ridge over the eastern Pacific pushes this moisture mostly north of us, but there's a potential for up to a half inch of water to spin into the Bear River Range this morning through tomorrow evening. Unfortunately, our warming trend continues. Precipitation will mostly fall as rain as snow lines rise from 7000 feet to almost 9000 feet by tomorrow. If we see the higher end of these totals, we may start to see wet snow issues.

Looking ahead, things look dry and warm. Temperatures will push into 10-15°F higher than normal Thursday into the weekend.

Additional Info

For more information, visit the UAC weather page here: UAC Weather Page For Logan-specific weather, go here: Logan Mountain Weather

-For all questions on forecasts, education, Know Before You Go, events, online purchases, or fundraising, call 801-365-5522.

-Remember, the information you provide could save lives, especially if you see or trigger an avalanche. To report an avalanche or submit an observation from the backcountry, go HERE

-Receive forecast region-specific text message alerts to receive messages about changing avalanche conditions, watches, and warnings. Sign up and update your preferences HERE

This forecast is from the U.S.D.A. Forest Service, which is solely responsible for its content. This forecast describes general avalanche conditions and local variations always occur.

General Announcements

CLICK HERE FOR MORE GENERAL INFO AND FAQ

This information does not apply to developed ski areas or highways where avalanche control is normally done. This forecast is from the U.S.D.A. Forest Service, which is solely responsible for its content. This forecast describes general avalanche conditions and local variations always occur.

Observations and Avalanches

Backcountry Emergency Procedures