Forecast for the Salt Lake Area Mountains

Saturday morning, February 17, 2018
The avalanche danger is CONSIDERABLE on steep, upper elevation north through easterly facing slopes with recent deposits of wind-drifted snow. A triggered wind drift may step down to a deeper weak layer, resulting in a large, dangerous avalanche. All other steep mid and upper elevation terrain have a MODERATE avalanche danger.
Low angle, wind sheltered, shady slopes will have the best powder snow with less avalanche risk.
Sunday and Monday - a winter storm with strong winds and heavy snowfall will increase the avalanche danger in all the mountains of northern and central Utah. Local avalanche forecasts are updated every morning.

Special Announcements
We are saddened to report that Orem resident Alexander Marra was killed in an avalanche today, Saturday, February 10, in Wyoming. He was skiing out-of-bounds at JHMR, and triggered a 2-foot deep slide that took him over cliffs. Our thoughts and sympathies go out to his family and friends. Accident Report.
Episode 5 of the UAC podcast "To Hell in a Heartbeat - A Conversation With Tom Diegel and Matt Clevenger About the 12.26.08 Full Burial on Little Water" is live. Matt and Tom about the avalanche documented in To Hell in a Heartbeat. Check it out on ITunes, Stitcher, the UAC blog.
Where are We Going? The Cottonwood Canyons are busy places with complex mixes of public and private land, and it can be confusing. This Blog illustrates just how confusing it can be and has a few resources to help you figure it all out.
Weather and Snow
After 48 hours of well-behaved winds, speeds kicked up last night, especially at the upper elevations. At times, the southwesterly winds have averaged 15 to 25 mph, with gusts in the 30s at the mid elevations. The upper elevations are where the real action is – 35 to 45 mph averages, gusting to 60 mph. Mountain temperatures range from about 10 degrees to the low twenties.
There was just enough sun yesterday that the snow on most steep southeast through westerly facing slopes will be crusted, the upper elevation terrain is becoming wind damaged, but excellent soft powder remains on wind-sheltered shady slopes.
Use the Week in Review to catch up on this past week's 3 storms and avalanche activity:
Recent Avalanches
Two slides were triggered in the backcountry yesterday, the most significant on northeast facing West Monitor, when the 5th person triggered a slide 2 feet deep and 350’ wide. Happily, they were able to get off the slab to the side and not buried in the deep debris pile.
With better visibility, we have more information on avalanches from both Thursday and Friday:
02/16/2018 Salt Lake region: Avalanche: West Monitor, Snowboarder trigger - 2' deep - 350' wide
02/16/2018 Salt Lake region: Avalanche: Little Superior, Skier trigger - 14" deep - 40' wide
02/15/2018 Salt Lake region: Avalanche: Cardiff Fork, Natural trigger - 40' wide
02/15/2018 Salt Lake region: Avalanche: Emma Ridges, Skier trigger - 18" deep - 20' wide
02/15/2018 Salt Lake region: Avalanche: Reynolds East Face, Skier trigger - 3' deep - 50' wide
02/15/2018 Salt Lake region: Avalanche: Catchers Mit, Skier trigger - 2' deep - 100' wide
02/15/2018 Salt Lake region: Avalanche: Pointy Peak, Natural trigger - 2' deep - 100' wide
02/15/2018 Salt Lake region: Avalanche: Airplane Peak, Natural trigger - 3.5' deep - 100' wide
02/15/2018 Salt Lake region: Avalanche: Hogum Hogback, Natural trigger - 2' deep - 70' wide
Wind Drifted Snow




Description
Today’s stronger winds have lots of snow to drift and blow around. Wind drifts, known as wind slabs, often look smooth and rounded, and when you find one, they can be cracky, denser and deeper than the surrounding snow. As the winds are getting well down into the mid elevations, look for drifts along both mid and upper elevation ridge lines and cross-loaded along gully walls, mid slope break overs and sub ridges. Avoid any wind drifts on steep slopes. The winds are significantly stronger at the upper elevations, so be aware of steep wind drifted slopes above – natural avalanches are possible.
Persistent Weak Layer




Description
The weight of Thursday’s snow was enough to make the buried faceted weak layers reactive once again on a few slopes. Today’s westerly winds will be adding more snow and weight onto slopes with buried facets – especially upper elevation slopes facing northerly through easterly, making them easier to trigger. A wind slab avalanche could trigger a deeper slide, failing on one of these faceted weak layers.
There is a lot of variability in the snowpack strength and depth, with facet layers both mid pack and near the ground. Slopes with a shallower snowpack tend to have weaker snow – including slopes that have slid one or more times this year. Cracking and collapsing are bulls-eye clues to instability.
Wet Snow




Description
Even with the cooling breeze, sun and warm temperatures may heat the snow on steeper southeast through westerly facing slopes today. Human triggered and natural wet loose sluffs will become possible as the snow becomes damp and wet, possibly running longer than expected on the slick crusts beneath. Roller balls are often the first sign on heating snow.
Additional Information
It will be warm and windy today, with temperatures nearing 30 at 10,000’ and 40 to 45 at 8,500’. Winds will increase with elevation – 20 to 30 mph averages at 9 to 10,000’, with gusts in the 40s. The highest peaks will average to 40 mph, with gusts in the 60s.
It will be very windy tonight and Sunday ahead of a strong cold front that should reach northern Utah late Sunday afternoon, bringing periods of snow through at least Monday night. 12 to 24” are possible.
General Announcements
CLICK HERE FOR MORE GENERAL INFO AND FAQ
The UAC has new support programs with Outdoor Research and Darn Tough. Support the UAC through your daily shopping. When you shop at Smith's, or online at Outdoor Research, REI, Backcountry.com, Darn Tough, Patagonia, NRS, Amazon, eBay a portion of your purchase will be donated to the FUAC. See our Donate Page for more details on how you can support the UAC when you shop.
Benefit the Utah Avalanche Center when you buy or sell on eBay - set the Utah Avalanche Center as a favorite non-profit in your eBay account here and click on eBay gives when you buy or sell. You can choose to have your seller fees donated to the UAC, which doesn't cost you a penny
This information does not apply to developed ski areas or highways where avalanche control is normally done. This advisory is from the U.S.D.A. Forest Service, which is solely responsible for its content. This advisory describes general avalanche conditions and local variations always occur.