Avalanche forecast

Ogden

Issued Feb 16, 2021valid to Feb 17, 2021Utah Avalanche Center

Avalanche danger

Alpine
Treeline
Below treeline

Out of date — this forecast expired 6 years ago. You’re viewing past conditions, not the current bulletin.

Highlights

DANGEROUS AVALANCHE CONDITIONS WILL EXIST FOR THE NEXT SEVERAL DAYS. Today the avalanche danger is HIGH at mid and upper elevations. The danger may rise to EXTREME in some areas within the next day. The avalanche danger is CONSIDERABLE at low elevations. Avoid all avalanche terrain and avoid being under or near any steep slope. Even very small slopes can bury a person.

Heavy snowfall, strong westerly winds, and a weak faceted snowpack have created very dangerous avalanche conditions. Natural and human triggered avalanches are very likely. Even unusual avalanches are possible in atypical terrain on atypical aspects and elevations. Anybody going into or near the mountains today should avoid being near or under any steep slope - this includes skiing, snowshoeing, running, sledding, dog walking, etc.

Avalanche problems

Persistent Slabs
N
NE
E
SE
S
SW
W
NW
Alpine
Treeline
Below treeline
Likelihood
Almost Certain
Size
4
Overnight this storm added a huge load of snow and wind blown snow to a very weak and faceted snowpack. Avalanches will be big and destrcutive, 3-5 feet deep and hundreds of feet wide or larger.

The most suspect terrain continues to be the west through north through southeast facing aspects at mid and upper elevations. HOWEVER, with so much snowfall and wind - upper elevation south-facing terrain and low elevation north-facing terrain will also produce avalanches that break on buried persistent weak layers.

Keep in mind:

Avalanches can be triggered from a distance or below.

Any fresh wind slab or new snow avalanche may step down several feet into older snow.

With such a large and rapid load of snow, many slopes slopes that have not been producing avalanches previously may do so today.
Wind Slabs
N
NE
E
SE
S
SW
W
NW
Alpine
Treeline
Below treeline
Likelihood
Likely
Size
3
With the heavy snowfall and strong westerly winds, new slabs of wind drifted snow will continue to form and produce avalanches today. Some of these avalanches can be triggered by people, some of these avalanches will occur on their own. The high winds can load a slope 10 times faster than just snowfall on its own. This combination of loading from winds and snowfall will make any wind-loaded slope very dangerous to travel near or under.

Even though winds are blowing from the west, slopes at any aspect at mid and upper elevations can be affected. Look for signs of recent wind loading such as smooth, rounded, pillow shaped deposits of snow.

Additionally, these elevated winds will increase the size of our cornices adorning many ridgelines, making them possibly even more sensitive. Stay well back from - and avoid travel below - corniced ridges.
Storm Slabs
N
NE
E
SE
S
SW
W
NW
Alpine
Treeline
Below treeline
Likelihood
Likely
Size
2
In any areas not impacted by the high winds, you will see new snow avalanches on all aspects and elevations.

During higher rates of snowfall (greater than1 an inch per hour), avalanches will be easier to trigger. Periods of snowfall exceeding 1 inch per hour are likely to continue throughout the day.

These new snow avalanches can impact anybody going into or near the mountains today including skiing, snowshoeing, running, dog walking, sledding, etc.

Avoid traveling near or below steep slopes as these new snow avalanches can run fast and far. Extreme caution is required.

Avalanche Warning

WARNING ISSUED

THE AVALANCHE DANGER RANGES FROM HIGH TO EXTREME ACROSS THE WARNING AREA

IN EFFECT FROM 6 AM MST THIS MORNING TO 6 AM MST WEDNESDAY

FOR THE MOUNTAINS OF MUCH OF THE STATE OF UTAH, INCLUDING THE WASATCH RANGE...BEAR RIVER RANGE...UINTA MOUNTAINS...MANTI-SKYLINE...THE FISH LAKE REGION…PAHVANTS…TUSHARS…AND THE CEDAR CITY AREA MOUNTAINS.

VERY DANGEROUS AVALANCHE CONDITIONS EXIST. NATURAL AND HUMAN TRIGGERED AVALANCHES ARE CERTAIN OVER THE NEXT SEVERAL DAYS. STAY OFF OF AND OUT FROM UNDER SLOPES STEEPER THAN 30 DEGREES

Recent Activity

Yesterday, there were multiple reports of avalanches being triggered on Culter Ridge. These were both skier triggered avalanches 4-16" within the new or wind drifted snow.

Overnight, a large natural avalanche cycle occurred within Little Cottonwood Canyon. At this time the full extent is not known but infrasound readings point to debris across the road in multiple locations.

Photo of one of the Cutler Ridge Avalanches (H. Iverson)

Snow and Weather

This morning, it is snowing in the mountains, up to 1" of snow an hour at times. Mountain temperatures are in the mid-20s F, and westerly winds have increased averaging 10-20 mph and gusting above 40 mph at upper elevations. The new snowfall and high winds are rapidly loading our snowpack.

Today, the heavy snowfall and high winds will continue. Temperatures will drop to the mid-teens F, and westerly winds will average 15-25 mph and gust up to 35 mph at the upper elevations. Snowfall rates should stay consistent. The Ogden area mountains should pick up another 4-8" before 5 PM tonight.

For this storm, the heavy snowfall and wind should continue into Wednesday morning before tapering off into dry weather Thursday. We can expect 1-2'+ of snow total by Wednesday morning.

Storm totals with the last 24 hours:

Ogden Area : 11 - 15" snow (.88" - 1.50" H2O)

General Announcements

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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