Logan Avalanche Advisory

Forecaster: Toby Weed


Danger by aspect and elevation on slopes approaching 35° or steeper.
(click HERE for tomorrow's danger rating)

Danger Rose Tutorial

There is a level 1 or Low danger on the majority of slopes in the backcountry around Logan, and the snow appears fairly stable, especially in sheltered terrain. But, there are still pockets with a level 2 or Moderate danger, and you might trigger wind slab avalanches on very steep drifted slopes. You'll be most likely to find these on the lee sides of exposed ridge-lines and in and around terrain features where snowdrifts are deposited. Use normal caution, but continue to practice safe travel protocols and evaluate the snow and terrain carefully.....


Although many popular slopes saw a bit of traffic over the Christmas Week, you can still find nice powder conditions, especially in sheltered shady terrain. The mountains picked up a couple fresh inches yesterday.

The Tony Grove Snotel at 8400' reports a couple inches of new snow overnight containing 2/10ths of an inch of water. There's 76 inches of total snow at the site containing just under 180% of average water for the date. The 9700' Campbell Scientific weather station on Logan Peak is down, but Mt Ogden reports sustained 20-30 mph winds overnight from the west and 13 degrees.....


No avalanches have been reported in the Logan Area since a party of skiers intentionally triggered a nice wind slab on Thursday in upper Mill Hollow by dropping a cornice chunk on a drifted slope. The hard slab avalanche was reported to be around 1 foot deep and 75 feet wide, but it didn't run very far before breaking up in the trees below. There was a fairly widespread avalanche cycle across the region spawned by the pre-Holiday storm at the beginning of last week, with evidence of large natural avalanches observed across the Bear River Range and in the Wellsville Mountain Wilderness....


      Over the next 24 hours.

Sustained west winds overnight probably drifted yesterday's couple inches of fresh snow into sensitive shallow wind slabs on the lee sides of ridge-tops and in exposed upper elevation terrain. Wind slabs also built up over the weekend under a sustained south-southeast wind, and some formed in somewhat unusual or unexpected places..... Weak frost crystals or surface hoar was observed on Friday, and could act as a persistent weakness under some of these older wind slabs. Watch for and avoid stiffer drifted snow or potential wind slabs near ridge lines and in and around deposition prone terrain features like gullies, cliff-bands, and sub-ridges. You might trigger wind slab avalanches a foot or so deep on very steep drifted slopes....


A strong Pacific storm will impact the region midweek, with sustained snowfall beginning Wednesday. This storm looks like it could bring significant snowfall to the valley floors as well as the mountains... Winds will shift around from the south tomorrow ahead of the storm and temperatures will rise a bit. Expect strong southeast winds increasing on Tuesday night and heavy snow on Wednesday and Thursday........


You can view a photo summary of last year's avalanche activity in the Logan Area HERE

I will be update this advisory in the mornings on Monday, Wednesday, Friday, and Saturday, and on other days if backcountry avalanche conditions warrant...

Send us your avalanche and snow observations. You can also call me at 435-757-7578, or email to uac@utahavalanchecenter.org

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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.

This information does not apply to developed ski areas or highways where avalanche control is normally done.  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.

This advisory provided by the USDA Forest Service, in partnership with:

The Friends of the Utah Avalanche Center, Utah Division of State Parks and Recreation, Utah Division of Emergency Management, Salt Lake County, Salt Lake Unified Fire Authority and the friends of the La Sal Avalanche Center. See our Sponsors Page for a complete list.