Bollettino valanghe

Salt Lake

Pubblicato il Mar 19, 2022valido fino al Mar 20, 2022Utah Avalanche Center

Pericolo valanghe

Alta quota
Limite del bosco
Sotto il limite del bosco

Non aggiornato — questo bollettino è scaduto 4 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

A 'scary' MODERATE danger exists on steep west to north to east facing aspects of all elevations. You can trigger 1-3' deep avalanches and you can trigger from a distance or from below. Collapsing and cracking may not be noted. Pay attention to heating and cloud cover to determine the wet avalanche potential and look for the development of wind drifts by the afternoon.

Problemi valanghivi

Loose Wet
N
NE
E
SE
S
SW
W
NW
Alta quota
Limite del bosco
Sotto il limite del bosco
Probabilità
Unlikely
Dimensione
2
The wet avalanche conditions will depend on the cloud cover and winds. IF there is enough sun, watch for the solar aspects to become wet and unstable with daytime heating. IF the clouds result in greenhousing, the low/mid elevation polar aspects may produce some wet activity as well.

Signs that wet avalanches will start happening include; seeing other small wet slides, seeing snowballs or pinwheels roll downhill with increasing frequency, and seeing upper layers of snow become increasingly wet.
Wind Slabs
N
NE
E
SE
S
SW
W
NW
Alta quota
Limite del bosco
Sotto il limite del bosco
Probabilità
Possible
Dimensione
1
By afternoon, the winds will be strong from the southwest. Watch for snow transport and fresh, potentially sensitive drifts in steep terrain. Wind drifts are more likely to be found on steep northwest to north to east facing aspects at the mid and upper elevations.
Persistent Slabs
N
NE
E
SE
S
SW
W
NW
Alta quota
Limite del bosco
Sotto il limite del bosco
Probabilità
Possible
Dimensione
3
Human triggered avalanches 1-3' deep remain possible on steep west to north to east facing slopes of all elevations. You will probably trigger them from a distance.

People have triggered these soft slab avalanches failing on our Jan/Feb drought layer facets nearly every day for a month. These avalanches seem most problematic on north to northeast facing slopes at the mid-elevations but The TAKE-HOME is that a great deal of uncertainty* exists with this tricky and dangerous snowpack. Many professionals and many very experienced backcountry skiers and riders have been surprised or had close calls in the past week and a half.

Let that sit in for a moment.

We estimate the danger by looking at the likelihood, size, spatial distribution, and character, if you will, of the avalanche. For all intents and purposes, the size and locations haven't changed. What has changed is that these avalanches are more stubborn and less sensitive and - lacking immediate signs of instability (ie-cracking/collapsing) - will want to lure you out onto the steep terrain. Don't fall for it.

*Uncertainty. High uncertainty requires a wide margin for error.

Know that you don't know. You won't know exactly when and where you will trigger the avalanche, but you will probably trigger it from a distance. These types of avalanches are Unmanageable.

If you choose to ride suspect terrain, choose terrain that won't kill you if the snowpack disagrees with your assessment of it. Bashed through the trees, over a cliff and buried deeply in a gulley? No good.

Be cognizant of runout zones. How far will the avalanche run if you trigger it from below? Do you know how to estimate runouts?

TRAVEL ADVICE - CHOOSE LOWER ANGLE SLOPES WITH NO OVERHEAD HAZARD.

Special Announcement

A new piece called " A Reckoning " talks about the recent string of human-triggered avalanches. If you missed the essay Deus Ex Machina, published just at the onset of close calls and accidents, you'll find it HERE>

Please help support avalanche forecasting throughout Utah. Donate to the Spring Campaign to help raise the funds to support the forecasting you rely on.

Recent Activity

We received a late report of a significant avalanche from Thursday. This avalanche was remotely triggered on the third trip up the skin track near West Deso. The party of four collapsed the slope, triggering the 3' deep and 200' wide avalanche on a northeast facing slope at 9100'. West Deso is in upper Mill D North of BCC.

Explosive testing triggered one avalanche into weak faceted snow on a steep northeast facing slope at 10,500' in mid-BCC.
UDOT BCC reported a new shallow wet slab avalanche on Mineral Slab at 7600'.

Find all the observations HERE.

Greg Gagne's Week in Review is published and can be found HERE.

Snow and Weather

Skies are partly cloudy. Winds are light but they've begun to back to the west ahead of tomorrow's storm. Temperatures are in the low to mid-20s.

Travel is easy with excellent coverage, particularly in the upper elevations. Base depths are 80-105" in the upper Cottonwoods and 50-80" along the Park City ridgeline. The mid-week storm of 2-4" added a little window dressing to the landscape, but wind, sun, and thermal crusts abound. Still, one can find good riding conditions in the sheltered terrain. Enjoy.

Looking west in upper White Pine of LCC yesterday

For today, expect the winds of change. Winds will continue backing to the southwest and I expect to see wind speeds of 30-40mph with gusts to 60 by late afternoon. Temperatures will rise into the mid-30s up high, the mid-40s down low. Mid and upper level clouds will begin to stream in throughout the day. Tomorrow's cold front crashes through mid-morning and while the storm looks like it is splitting apart, we may still pick up 4-8" by Sunday afternoon. We'll see.

General Announcements

Who's up for some free avalanche training? Get a refresher, become better prepared for an upcoming avalanche class, or just boost your skills. Go to https://learn.kbyg.org/ and scroll down to Step 2 for a series of interactive online avalanche courses produced by the UAC.

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