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Forecast for the Logan Area Mountains

Toby Weed
Issued by Toby Weed on
Thursday morning, December 11, 2025

Heightened avalanche conditions exist in the backcountry, the danger is MODERATE, and people could trigger dangerous avalanches on a buried persistent weak layer buried up to 2 feet deep on slopes steeper than 30 degrees. Evaluate snow and terrain carefully, as there may be CONSIDERABLE danger in some areas at upper elevations on previously drifted slopes with poor snow structure, particularly in the Northern Bear River Range.

  • Avalanches might be triggered remotely, from a distance, or from below.
  • Most slopes below 7000 feet are bare of snow or have only very shallow snow cover.
Low
Moderate
Considerable
High
Extreme
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Weather and Snow

This morning, it's 39° F at the Tony Grove Snotel at 8400 feet, with 25 inches of total snow. Once again overnight, the station reported some precipitation, but no new snow. Winds are sustained from the west, gusting over 40 mph, but there is little drifting.

Last weekend, the wet, warm, and windy storm produced nearly 3 inches of SWE (snow water equivalent) and about a foot of dense, heavy snow. The storm deposited a dense slab of heavy snow on top of a very weak, faceted snowpack from November. This strong-over-weak, poor snowpack structure was responsible for many sizable natural avalanches, as well as red flags—like whumfing and shooting cracks. Although these obvious signs of instability are now much less frequent, snowpit stability tests still indicate potential for slab avalanches to propagate across slopes.

Tuesday's snow stability tests in the Emigration Creek drainage showed potential for avalanches to propagate, and continued instability in some areas...Below is a video of snow stability tests from Emigration Creek area on December 9

NWS Forecast Discussion: High pressure will be in place through the weekend, with dry conditions and temperatures around 10-20° F warmer than normal. Valley inversions will build as high pressure is in place. Unsettled weather looks to make a return to northern Utah by the middle of next week.

Today: Sunny, with a high near 46° F. Light west wind increasing to 6 to 11 mph in the morning. Tonight: Mostly clear, with a low around 27° F. West wind 5 to 8 mph becoming calm in the evening. Friday Mostly sunny, with a high near 44° F. Calm wind becoming west 5 to 9 mph in the afternoon.

Recent Avalanches

A rider reported triggering an avalanche on a northeast-facing slope near 9000 feet on Sunday while riding near Doubletop Mountain in Steep Hollow. The slide broke on weak, old faceted snow that was buried during last weekend's storm. His full observation is HERE.

Numerous natural avalanches occurred during the storm, overnight, the night of December 5. ***For all observations and avalanche activity in the Logan Zone, go HERE

Broad natural avalanches on Cornice Ridge were visible from a distance on Sunday.

Avalanche Problem #1
Persistent Weak Layer
Type
Location
Likelihood
Size
Description
Weak, faceted snow from November is buried by a slab of heavy, dense storm snow up to 2 feet deep. Where sugary snow from November existed before last weekend's storm, on north-facing slopes at mid-elevations (7500-8500 feet), and on all slopes at upper elevations, there is potential to trigger dangerous, widely propagating avalanches. In these conditions, avalanches might be triggered remotely from below or from a distance.
  • Slab avalanches failing on the buried persistent weak layer are most likely in areas where the wind has drifted snow, near ridgelines, and mid-slope catchment areas like gullies.
  • 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.
Additional Information

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

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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
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.