Forecast for the Salt Lake Area Mountains

Evelyn Lees
Issued by Evelyn Lees for
Friday, February 22, 2019
A MODERATE AVALANCHE DANGER exists at upper elevations for triggering a soft slab of wind drifted snow or a loose snow sluff. Avoid travel on and below the huge cornices. At mid and low elevations the danger is LOW, though there are scattered wind drifts to be avoided.
There is a very isolated chance a person, cornice or smaller slide could trigger a slide breaking on facets near the ground, in thinner snowpack areas or slopes that have previously slide this winter.
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Moderate
Considerable
High
Extreme
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Special Announcements
Heading south for the weekend? Avalanche Warning for the Abajos and La Sals. Find the forecasts for the La Sals, Abajos and Manti/Skyline HERE, and we do post obs from the mountains of southwest Utah. View them here or submit obs here.
Catch up on the past week of snow, weather and avalanches with Greg Gagne’s Week in Review.
Weather and Snow
Under cloudy skies, light snow has been falling, adding another 2 to 4” of low density powder from the Ogden area mountains south, with the Provo area mountains picking up as much as 5”. Temperatures are once again cold - in the single digits at most stations, and are expected to only warm into the teens today. Skies should partially clear this afternoon, and the powder is amazing on all aspects.
The wind direction has been shifting around the last 24 hours, but has mostly been from the southeast. Today, it should eventually settle on northeasterly. Speeds are currently averaging averaging 5 to 10 mph at the mid to upper elevations, with gusts barely 15 mph, and expected to stay light. Canyon mouths like Parleys, Weber, Provo and Ogden are where the greatest speeds were overnight, and gusts in the 30s will continue for a while this morning. Late this afternoon or this evening, the winds will shift to the northwest and increase, with averages 15 to 25 mph, and gusts in the 30s.
Recent Avalanches
Yesterday’s uptick in southeast wind speeds drifted the snow into shallow wind slabs, sensitive to ski cuts. The largest reported from the backcountry was 8” deep by 80’ wide, running a long distance. A few natural cornice failures were reported from upper Little Cottonwood, that then triggering soft slabs beneath, large enough to bury a person.
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Avalanche Problem #1
Wind Drifted Snow
Type
Location
Likelihood
Size
Description
Wind slabs: It will be another day of dodging the wind drifts at the upper and mid elevations. With the wind direction over the last 24 hours varying by drainage, drifts can be found on almost every aspect. North and northwesterly facing slopes were especially loaded by yesterday’s southeasterly winds. The abundant low density snow is forming both the weak layer and the soft slab. The best way to avoid these wind slabs is to look for them. Wind drifts are often rounded, smooth, and feel denser or “cakier” than the surrounding snow. Cracking in the snow is a sure sign of a wind drift. Also look for signs of new drifting - winds are forecast to shift to the northwest and increase late this afternoon and overnight. Watch for plumes off ridge lines and peaks above you and blowing snow where you are.
Sluffs - can be triggered on steep slopes of all aspects, running far distances in continuously steep terrain. They are large enough to catch and carry a person on foot.
The large cornices have become a permanent part of the landscape, and were joined by a few new smaller ones from yesterday’s easterly winds. The large, older ones will break back much further than expected - avoid travel below and on these.
Cracking - a sure sign of a wind slab. Photo by Malone, Morgan, Catino or Mccurdy
Additional Information
Snowpack layering that’s catching our attention right now is the February 14th rain crust and the development of facets around it. The crusts is below about 8,500’, and quick and easy to find with hand pits and pole probes. It’s worth keeping an eye on this layering to see what develops.
Drew Hardest photo, Maybird.
General Announcements
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.