Ogden Avalanche Advisory

Forecaster: Evelyn Lees


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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 this morning, but will quickly rise to pockets of CONSIDERABLE on and below any steep slope that receives direct sun and or heating from high thin clouds. Any overnight refreeze of the snow will be very shallow, so get out early, and be off of and out from under steep slopes by around 10 am. Both wet loose slides and wet slab avalanches are possible.

There continue to be isolated places where deeper, dry slab avalanche can be triggered on steep, upper elevation, northerly facing slopes with a shallow snow pack, including slopes that have slide this year.


The unreasonable, unseasonable warm temperatures continue, assisted by overnight, insulating high clouds. This morning, most stations are about 10 degrees warmer than yesterday morning, in the mid 40s to low 50s in the Ogden area mountains. The southwesterly winds also increased overnight, averages to 45 mph across the high ridges, and gusts currently to 50 mph. Any surface refreeze will be very shallow and short lived this morning.


Roller balls and wet loose sluffs were the only reported activity yesterday from the relatively empty backcountry.


      Over the next 12 hours.

Wet avalanches remain the number one concern today. Expect both natural and easily triggered wet loose sluffs on all steep, sunny slopes today. The snow on northerly facing slopes will also sluff easily, with the periods of high, thin clouds adding additional heat into the snow pack. Wind is the only cooling element on our side today, and even that will decrease this afternoon.

We may even have the start of a wet slab avalanche cycle today. It often takes multiple non-freezing days and nights for wet slab avalanches to occur. However, the widespread nature and number of weak layers and ice crusts in the snowpack where water can pool makes me suspect it may take less time. A larger trigger like a wet sluff could gouge to the ground in wet facets or trigger a wet slab avalanche mid pack. Plan your backcountry travel carefully – avoid travel on and below steep slopes, especially in or above gullies or on slopes that funnel. Wet snow avalanche debris sets up like concrete.


      Over the next 24 hours.

Four deeper slab avalanches have been triggered in the past 4 days, two explosive triggered at resorts and two human triggered in the backcountry, out of all the heavily traveled slopes. This illustrates the very isolated chance of triggering a slide on one of the old weak layers near the ground. The most suspect slopes are those with a very shallow pack, slopes which have already slid this year, or that are very steep and rocky.


Another scorcher of a day, with temperatures warming into the 50s at 8,000’ and to near 40 at 10,000’. The southwesterly winds will remain strong this morning, peaking around noon, before decreasing this afternoon. This morning, speeds will average in the 25 to 35 mph range, with gusts to 50 across the highest peaks, and 15 to 25 mph averages at the mid elevations. Cloud cover will be variable today – mostly intermittent high, thin clouds, with periods of full sun. Temperatures will continue to be very warm day and night through Sunday, with the southerly winds increasing again on Sunday ahead of a quick hitting cold front. This front Sunday night into Monday will bring a small shot of snow and cooler temperatures.

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.