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

The avalanche danger is MODERATE (2) in the backcountry around Logan, and the snow is generally very shallow and weak. Hard wind slab avalanches are possible on steep drifted slopes, and although they are slowly getting harder to initiate, you could still trigger dangerous persistent slab avalanches 1 to 3 feet deep in some areas.... Most likely in drifted terrain above around 8000 feet in elevation and on north, northeast, and east facing slopes steeper than about 35 degrees.

Evaluate the snow and terrain carefully, follow proper backcountry travel protocols, and continue to use cautious route-finding and conservative tactics, especially on drifted upper elevation slopes.


Like my children’s' favorite breakfast cereal, this weekend's snow contains a very high sugar content. In fact, weak sugary grains are first on the snowpack ingredient list, setting us up for nasty avalanche conditions when inevitable snowfall arrives... Not many people out in the backcountry, and the snow is way too shallow and rotten feeling in most areas. Although surface wind, sun, and rain crusts are widespread across the region, we've found cleaner air and reasonable and fast turning conditions in sugary re-crystallized snow in sheltered terrain... And, we’ve been riding on mostly supportable snow in some upper elevation areas. But the snow off-trail is generally very shallow, droppy, and still a bit spooky in most areas....

Its 27 degrees this morning at the Campbell Scientific weather station on Logan Peak at 9700', and there's currently a 25 to 30 mph wind from the southwest... The 8400' Tony Grove Snotel reports a temperature of 30 degrees, an inch of new snow, and 37 inches of total snow on the ground. The station sits at a dismal 43% of average water content for the date....


No avalanches were reported locally since last weekend, but 2010 is so-far quite an active year for avalanches in the backcountry around Logan...

Here's an updated local backcountry avalanche list:


      Over the next 24 hours.

Recent winds drifted snow into shallow stiff slabs in lee slope and terrain governed deposition areas. Triggered wind slab avalanches are possible on steep slopes in exposed terrain..


      Over the next 24 hours.

Very weak larger grained faceted snow and depth hoar plague the shallow snowpack on many slopes and at upper elevations, a dangerous, apparently very persistent weakness involves large faceted grains (depth hoar) elevated several inches above the ground on a solid October ice-crust.

Gradually becoming harder to initiate on most slopes, but triggered persistent slab avalanches 1 to 3 feet deep are still quite possible today on slopes steeper than about 35 degrees, especially on those at upper elevations with recent deposits of wind-drifted snow.


Expect cloudy, breezy, and fairly warm weather conditions today with mountain high temperatures above freezing and diminishing moderate southwest winds. There is a slight chance for a little snowfall tonight, and tomorrow's weather will practically replicate today's, with a bit thicker clouds perhaps and gradually increasing southwest wind.. Look toward Monday and Monday night for the first wave of accumulating snowfall under what looks to be a rather sustained moist southwest flow.


I will be issuing morning avalanche advisories for the Logan area on Mondays, Wednesdays, Fridays and Saturdays.

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Send us your avalanche and snow observations. You can also call me at 435-757-7578 or the SLC office at 800-662-4140, or email to uac@utahavalanchecenter.org

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The information in this advisory is from the U.S. Forest Service, which is solely responsible for its content. This advisory describes general avalanche conditions and local variations always occur.

I will update this forecast Monday morning. Thanks for checking in....

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.