Forecast for the Uintas Area Mountains

Craig Gordon
Issued by Craig Gordon for
Saturday, February 23, 2019
While not widespread and making up a small portion of the terrain available to ride today, in the wind zone, at and above treeline, you'll find pockets of CONSIDERABLE avalanche danger. Human triggered avalanches are LIKELY on steep wind drifted slopes, especially those facing the north half of the compass and particularly those with an easterly component to their aspect. Any avalanche that breaks into deeper buried weak layers near the ground will result in a deep, dangerous, and quite possibly unsurvivable avalanche.
You'll find MODERATE avalanche danger on steep, mid elevation, wind drifted slopes and human triggered avalanches are POSSIBLE.
Your exit strategy and ticket for a safer riding alternative exists on low angle, low elevation terrain, especially slopes facing the south half of the compass with no steep terrain above or adjacent to where you're riding. In terrain with these characteristics you'll find generally LOW avalanche danger and human triggered avalanches are UNLIKELY.
Low
Moderate
Considerable
High
Extreme
Learn how to read the forecast here
Special Announcements
The accident reports for the four avalanche fatalities are all finalized with some first-hand accounts and worth reading. We all have something to learn so that we can get home safely to our loved ones.
Jan 18 Electric Lake Accident (Skyline area)
Jan 25 Laurel Peak Accident (Moab area)
Feb 7 Circleville Mtn Accident (Southwest area near Beaver, UT)
Feb 9 Chalk Creek Accident (Western Uintas)
Above, Shannon tells a remarkably heartfelt, heavy story about the avalanche accident his friend Jason Lyman of Mona was involved in on Saturday February 9th, while snowmobiling on the west side of Humpy Peak in the East Fork of the Chalk Creek drainage. Of course the collective thoughts, prayers, and energy of the UAC go to the friends and family of Mr. Lyman.
Many thanks to these fine gentlemen for helping to install our Beacon Basin on the north end of the Nobletts parking lot. While you're in the hood and waiting for your partner or group, you can keep warm and test your avalanche beacon rescue skills at the same time.... your partners will be stoked.
Weather and Snow
The trough that's been homesteading over the region this week is moving east, but not before the last gasp of moisture was wrung out, delivering an inch or two of uber-light density snow. This morning, the skies are clear, the stars are shining brightly, and temperatures are in negative territory, hovering right around -4 degrees. Unfortunately, west and northwest winds increased just an hour or so ago and blow in the mid and upper 20's along the high peaks. Windchill values register close to -30 degrees. It's the type of day where you wanna get out of the wind and get onto sunny slopes where you'll find great riding and warmer temperatures, helping to take a bit of bite out of the air.
Above is hourly data from Trial Lake (9,945') and Windy Peak (10,662'). To view more regional weather stations click here.
Yep the snowpack is deep, the range is white and fat, and riding conditions are about as good as they get. With so much snow and water, Michael J is experiencing some of the best riding conditions in a couple years and says there's plenty of safe, low angle options where you can have a blast. More on his travels here.
Recent Avalanches
Last weeks cornice falls triggered massive avalanches breaking to weak snow near the ground.
Sunday, a large piece of cornice peeled off this ridge, initiating the slide below, and stripping this slope of its entire winter snowpack. The end result is a large slide breaking 6'-10' deep, over a 1000' wide, and running a historically long distance.
And from Friday...
Releasing sometime early Friday morning, this huge avalanche above, was triggered by a cornice fall in Upper Weber Canyon. Dave Kikkert and I took a look at this historic slide just hours after the dust settled. Averaging 6' deep, but topping 8'-10' deep in places, this avalanche was well over 1500' wide and ran 1000' vertically. Dave and I suspect a the thin portion of this slope to the lookers left is where the slide initiated. This swath of snow has avalanched several times this year, it's what we call a "repeater", and has remained thin and weak all winter. This slide clearly illustrates the complex snow structure, along with the tricky nature and scale of the recent avalanche activity in the western Uinta's.
And sadly, the tragic avalanche accident on February 9th in Chalk Creek is pictured above. Triggered while the sledder was low on the slope, this slide broke deep and wide, taking out the entire seasons snowpack, snapping timber as it crashed down onto the slope below.
Recent trip reports and avy activity found HERE.
Ad
Avalanche Problem #1
Persistent Weak Layer
Type
Location
Likelihood
Size
Description
Here's the deal- we've got a complicated snowpack structure that's just starting to become comfortable in its own skin... that's good news. The problem is, there's several persistent weaknesses buried deep in the pack and these are a concerning because anything "persistent" in the world of snow is slow to heal. While deep dangerous avalanches are becoming harder to trigger, recent avalanches breaking to the ground suggest all we need to do is find a shallow, weak portion of the snowpack, perhaps around a rock or bush that we can't see underneath the snow, collapse the slope (whoomph), and now we're staring down the barrel of a dangerous avalanche. This type of snow structure is particularly dangerous because we don't even have to be on a steep slope in order to trigger a slide... we just need to be connected to it. And here's the deceiving twist, the range is fat and white and the snowpack is gonna feel really strong and supportable. As a matter of fact, we can ride many slopes without incident and think we're good to go.
However, the key to a successful day of riding means avoiding bulls-eye terrain where unmanageable avalanche dragons live, and it's pretty straight-forward. The common theme for all the big avalanches we've seen recently have occurred on steep, upper elevation, wind drifted slopes facing the north half of the compass, along with slopes that avalanched earlier this season and have a shallow snowpack like in the image below.
Avalanche Problem #2
Wind Drifted Snow
Type
Location
Likelihood
Size
Description
There's no shortage of light density to blow around and it doesn't take strong winds in order to form fresh drifts, sensitive to our additional weight. Today's wind drifts are found mostly along the leeward side of upper elevation ridges,like in the image above, but there could be a few drifts lurking around terrain features like chutes or gullies. In any case, today you'll want to look for and avoid any fat, rounded piece of snow, especially if it sounds hollow like a drum.
Avalanche Problem #3
Cornice
Type
Location
Likelihood
Size
Description
This winters storms have been busy at work creating layers of cornice that may break back further than you might expect. And remember- several large, recent avalanches have been triggered with cornice fall. You definitely wanna give these large, unpredictable pieces of snow a wide berth and not ruin someones day below by inadvertently knocking a boxcar size piece of snow down on them.
Additional Information
High pressure builds into the region this weekend giving us mostly sunny skies and temperatures climbing out of the deep freeze and warming into the low 20's. West and northwest winds blow in the 30's along the high ridges. Not much change for Sunday, though a snow shower or two could sneak through the region late in the day.
General Announcements
The information in this advisory expires 24 hours after the date and time posted, but will be updated by 7:00 AM Sunday February 24th, 2019.
If you're getting out and about, please let me know what you're seeing especially if you see or trigger and avalanche. I can be reached at [email protected] or 801-231-2170
It's also a good time to set up one of our very popular avalanche awareness classes. Reach out to me and I'll make it happen.
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.