Avalanche forecast

Ogden

Issued Jan 12, 2024valid to Jan 13, 2024Utah Avalanche Center

Avalanche danger

Alpine
Treeline
Below treeline

Out of date — this forecast expired 3 years ago. You’re viewing past conditions, not the current bulletin.

Highlights

Dangerous avalanche conditions exist with a HIGH danger at mid and upper elevations and a CONSIDERABLE danger at lower elevations. Avalanches may fail 2-3' deep and hundreds of feet wide on a widespread persistent weak layer at all elevations.

Do not travel in avalanche terrain - do not be on, underneath, or adjacent to slopes approaching 30° or steeper.

With strong winds and several feet of snow forecast for this weekend, the avalanche danger is expected to increase.

Avalanche problems

Persistent Slabs
N
NE
E
SE
S
SW
W
NW
Alpine
Treeline
Below treeline
Likelihood
Very Likely
Size
4
Strong winds and heavy snowfall have overloaded a widespread persistent weak layer (PWL) that is now buried about 2' deep. Most avalanche activity on Wednesday and Thursday occurred on this PWL, with both natural and human-triggered avalanches, many being triggered remotely (from a distance).

With strong winds and heavy snowfall forecast, avalanches failing on this PWL will only become larger.

UAC forecaster Trent Meisenhimer describes the PWL problem from Wednesday field work on the North Ogden Divide:
Wind Slabs
N
NE
E
SE
S
SW
W
NW
Alpine
Treeline
Below treeline
Likelihood
Very Likely
Size
3
With plenty of loose snow available for transport, strong winds will create slabs of wind-drifted snow at all elevations. Strong winds such as this can work around terrain features, so you can expect to find fresh, sensitive wind drifts on any aspect. Triggering an avalanche in this wind-drifted snow is likely to step down into the PWL, creating a much larger avalanche.

Avalanche Warning

The avalanche danger for the warning area is HIGH for the mountains of northern and central Utah and southeast Idaho, which includes the Wasatch Range...the Bear River Range...Uinta Mountains...Manti-Skyline plateau...and the Mountains of Southwestern Utah.

Strong winds and heavy snowfall have created dangerous avalanche conditions. Avalanches failing on a widespread persistent weak layer buried under the new snow are very likely. Stay off of and out from under slopes steeper than 30°.

This avalanche warning is in effect from Friday, January 12, 2024 - 6:00am to Saturday, January 13, 2024 - 6:00am

Special Announcement

Road Closure: Weber County has closed the North Ogden Divide Road today due to natural avalanches hitting the road this morning. The NOD road may stay closed through the weekend.

Recent Activity

With nearly 20 avalanches reported from the mountains of Ogden, Salt Lake, and Provo, to say Thursday was an active day is an understatement. These avalanches were both natural and human-triggered, with many remotely-triggered from adjacent ridgelines. Most were on aspects facing north through east, but also northwest and southeast. Reports of collapsing on southerly aspects were reported as well.

You can peruse recent avalanche activity by clicking here.

In the Ogden mountains, control work from snow safety teams reported avalanches failing in the persistent weak layer. Natural avalanches were reported from Monte Cristo and overnight, natural avalanches reached the North Ogden Divide Road (photo below).

In the Salt Lake mountains (* human caught and carried) :

- West Will Ridgeline 2' deep 500' wide (photo below).

- Beartrap* (yes, Beartrap) 2' deep 80' wide.

- Yellowjacket* 1' deep 100' wide

- George's Bowl* 2' deep 150' wide

- Summit Park 1.5' deep 150' wide

Snow and Weather

As of 6 am, temperatures are in the single digits F, and winds are from the southwest through northwest, gusting into the 20's and 30's mph at mid elevations and 50's mph along the Ogden Skyline. 2-5" of snow has fallen overnight.

For today, temperatures will rise into the teens F and winds will be from the west/northwest and strong. At the mid-elevations, winds will gust into the 30's and 40's with stronger gusts along the upper reaches of the Ogden Skyline. 4-8" of new snow is expected by sundown.

Looking ahead, the National Weather Service has issued a Winter Storm Warning through 5 pm Sunday, with strong winds and several feet of snow.

Additional Info

Check out a forecaster discussion Mark and I had diving deeper into the forecast and how we will travel in the backcountry with a buried PWL

Check out this video Craig Gordon put together talking about the 5 red flags we use to determine if there is unstable snow.

1. Recent Avalanches

2. Cracking and Collapsing

3. Strong Winds

4. Heavy Snowfall

5. Rapidly Rising Temperatures

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