Lawinenlagebericht

Salt Lake

Veröffentlicht am Dec 14, 2024gültig bis Dec 15, 2024Utah Avalanche Center

Lawinengefahr

Hochgebirge
Waldgrenze
Unterhalb der Waldgrenze

Veraltet — dieser Lagebericht ist 2 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

The avalanche danger is CONSIDERABLE on upper-elevation slopes facing northwest, north, northeast, and east, where strong winds will likely overload a widespread, persistent weak layer. Here, avalanches may be triggered from a distance (remotely) and can be large enough to bury a human.

Careful snowpack evaluation, cautious route-finding, and conservative decision-making will be essential today.

Lawinenprobleme

Persistent Slabs
N
NE
E
SE
S
SW
W
NW
Hochgebirge
Waldgrenze
Unterhalb der Waldgrenze
Wahrscheinlichkeit
Likely
Größe
2
On almost all shady slopes across the mid and upper elevations, we have weak and faceted snow (weak layer) that will quickly become overloaded from strong wind blowing and drifting snow onto Lee slopes. It's not rocket science. Weak snow with heavier, more dense snow on top = avalanches. It's time to take a step back.

Natural and human-triggered avalanches are likely today across the upper-elevation wind-loaded terrain. These avalanches could be 1-2 feet deep, up to 100 feet wide, and large enough to bury a human. Today, an avalanche can be triggered remotely, meaning from a distance. I would stick to terrain under 30 degrees in steepness with nothing above or adjacent to you that could avalanche.

Trend: Increasing Danger

Recent Activity

Yesterday, snow safety teams reported that skis easily triggered shallow, dry, loose, and soft slab avalanches. On the way to the Sundial in Big Cottonwood, one hiker triggered a small new snow avalanche that was 6 inches deep and 10 feet wide and ran about 30 feet downhill (pic below). Hint: click the picture and it will link you to the observation.

Special Avalanche Bulletin

What: Heavy snowfall and drifting by strong winds will cause dangerous avalanche conditions to develop this weekend in the mountains of northern Utah.

When: In effect from 6 am MST this morning through 6 am Monday: For the mountains of Northern Utah, including the Wasatch Range...Bear River Range... and Western Uinta Mountains.

Impacts: Pre-existing, weak, faceted snow is widespread on northerly-facing slopes at upper and mid elevations, and dangerous avalanche conditions will develop on many slopes. People are likely to trigger avalanches by being on or below slopes steeper than 30 degrees. Avalanches could be triggered remotely (from a distance) or from below.

Snow and Weather

Within the past 36 hours, the mountains received a nice new coat of white paint. Snow totals range from 3-5 inches (0.18-0.20 water) along the Parkcity Ridgeline to 9-12 inches (0.45-0.55 water) in the Upper Cottonwoods.

This morning, the southerly wind has picked up ahead of an approaching storm. Current wind speeds are from the southwest, blowing at 15-30 mph with gusts into the 20s, 30s, 40s, and 50s across the upper elevation terrain. Mountain temperatures are also rising and range from 20-27 °F.

Today, we can expect warm air advection (warming temperatures) and strong southerly winds ahead of two small storms. The first piece of the storm should impact northern Utah late this morning, and we should see some snowfall starting around 11 a.m. Throughout the day, we could see anywhere from 2 to 5 inches of new higher-density snowfall. We could also see locally higher amounts in areas favored by a southwest flow.

We should see a brief lull in snowfall this afternoon as the first storm exits and the next arrives. However, the wind will remain from the southwest, averaging 15-30 mph with gusts into the 30s, 40s, and 50s across the upper elevations for the next 24 hours. The next wave of the storm will move in this evening, and we should see temperatures drop and snow densities decrease into Sunday. All said and done, we could see 7-13 inches (0.65-1.05 water) of new snow by Sunday morning.

Additional Info

Be sure to read Nikki's Week in Review as part of your preparations before you head out this weekend.

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