Lawinenlagebericht

Salt Lake

Veröffentlicht am Nov 27, 2024gültig bis Nov 28, 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

Avalanche danger is generally MODERATE across most of the forecast region, with localized areas of CONSIDERABLE danger on steep, wind-drifted westerly, northerly, and easterly aspects at upper elevations that have received the highest snow totals and strongest winds.

Cracking and collapsing are critical signs of instability and should not be ignored today. Human-triggered avalanches 1–3 feet deep are likely, with some natural avalanches possible as winds remain elevated throughout the day. Outside the wind zone, the new snow may still be reactive, with small avalanches capable of moving fast and traveling farther than expected.

Remember, early-season conditions make injuries more likely if caught in an avalanche of any size.

Lawinenprobleme

Persistent Slabs
N
NE
E
SE
S
SW
W
NW
Hochgebirge
Waldgrenze
Unterhalb der Waldgrenze
Wahrscheinlichkeit
Likely
Größe
2
We currently have a snowpack structure primed for avalanches: the classic strong-over-weak setup. It’s a tenuous balance, just waiting for enough new snow and wind to tip the scales. The key questions are whether the storm delivered enough of a load and if avalanches will be triggered today.

Given the storm totals nearly 2' in some places and sustained high winds, the answer is likely yes, but primarily in areas that receive the most snow and wind - read, upper Big Cottonwood, Park City Ridgeline, areas of the Wasatch back that had snow on the ground prior to this event. Expect to trigger 1–3' deep soft slab avalanches on slopes facing west to east at mid and upper elevations. These slabs will likely fail within the old snowpack—a mix of weak, sugary facets and crusts. In steep, wind-drifted terrain, watch for shooting cracks, audible collapses, and the potential to trigger soft slabs.

Listen for whumphs or collapses, test small slopes to gauge reactivity, and look for shooting cracks. Extended Column Tests can also provide valuable information about snowpack stability. Proceed carefully and be prepared for reactive conditions.
Wind Slabs
N
NE
E
SE
S
SW
W
NW
Hochgebirge
Waldgrenze
Unterhalb der Waldgrenze
Wahrscheinlichkeit
Possible
Größe
2
Overnight westerly winds ramped up to nearly 60 mph. With strong winds and fresh snow available for transport, expect sensitive slabs of wind-drifted snow on upper-elevation slopes and mid-elevation terrain features prone to drifting. These slabs will be most pronounced on leeward (easterly) slopes, but high winds can load any aspect due to swirling and shifting directions, a phenomenon known as cross-loading.

Look for signs of wind-drifted snow, such as pillow-shaped deposits, and avoid those slopes.

The best riding conditions will be in sheltered, lower-angle terrain out of the wind.

Outside the wind zone, the new snow may still be reactive, with potential instabilities at the interface with the old snow surface or within storm or wind-blown layers. While these avalanches are likely to be small, they could move fast and travel farther than expected.

Special Announcement

The 17th Annual Utah Snow and Avalanche Workshop (USAW) is scheduled for Saturday December 7th - Information and tickets available here.

Recent Activity

At 10,400' on a northeast aspect of Rocky Point, a skier triggered a 4" deep, 10' wide soft slab avalanche on the new snow/old snow interface. Though small and unlikely to bury someone, the slide ran most of the way down the chute and could easily knock a skier off their feet. Ski areas reported a handful of soft-windslabs.

You can find the most recent observations HERE.

Snow and Weather

This morning, light snow is falling in the mountains, and temperatures range from the low-teens to low 20s F. Winds have shifted from the south to the west-northwest, reaching gusts into the 20s mph at mid-elevations and nearly 50 mph at the uppermost elevations. Snowfall persisted overnight, adding 2 - 9.5 inches (with .35-.70" of water) as of 5 AM.

This brings the current storm totals to 5-19 inches of snow (with .55-1.35" of water), particularly favoring the Wasatch Back, Park City Ridgeline, and Upper Big Cottonwood.

Today, moist northwest flow will keep unstable conditions and lingering snow showers in place early this morning, tapering off by afternoon as drier air moves in. The heaviest snowfall is expected through mid-morning, but additional accumulations will be minimal. Skies will begin to clear this afternoon, with gradual clearing continuing overnight. Temperatures will reach the low to mid-20s F. Winds from the west-northwest will persist, remaining moderate with gusts reaching into the upper 40s mph at the higher elevations. There is a possibility of an additional 1 inch of snow before this afternoon.

As for the weather outlook, it does not look good. You may need binoculars to see the next storm. And even that may not help.

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