THE AVALANCHE DANGER IS HIGH. Natural and human triggered avalanches are expected on many aspects and elevations, particularly in areas that have seen the most snow and wind. Those without excellent avalanche and route finding skills should avoid the backcountry through the Monday/MLK weekend. Terran around Aspen Grove above Sundance and beyond Tibble Fork is to be avoided.
While the backcountry will be dangerous over the next several days, enjoy the Greatest Snow on Earth at some of the Greatest Ski Resorts on Earth where they employ teams to help mitigate the risk.
24 hours of strong southwest to now moderate northwest winds have sensitive drifts to 3' deep on many aspects at the mid and upper elevations. They're to the lee of ridgelines and cross-loaded into couloirs and gullies and may be triggered at a distance or break above you. Windslabs are often manageable but these are not. Too big, too stiff, too unpredictable.
Anytime you add 20-25" of snow and strong wind, the rapid loading and stress will often find an imperfection somewhere. The interstorm weaknesses from early season as well as those from pre and post Christmas/New Years remain suspect. Thinner snowpack areas and especially areas that have avalanched before showed their hand yesterday and are likely to do so again today. Any new snow avalanche may step down into this old snow layering, resulting in a much more dangerous outcome. Snapped trees, femurs, you get the idea.
Snowfall rates yesterday and overnight were eye-opening with at-times "2-3"/hour" intensity. This, combined with the upside down nature of the density trends (even back to Wednesday's storm), leave us with unstable storm snow that will continue to be reactive to human weight on all aspects at the mid and upper elevations. These too are often viewed as "manageable" but are likely too much snow and too upside down for much margin of safety.
AN AVALANCHE WARNING CONTINUES FOR THE MOUNTAINS OF NORTHERN UTAH, TO INCLUDE THE BEAR RIVER RANGE, THE WESTERN UINTAS, AND THE ENTIRETY OF THE WASATCH RANGE. STRONG WINDS AND HEAVY SNOWFALL HAVE PUSHED THE AVALANCHE DANGER TO HIGH. NATURAL AND HUMAN TRIGGERED AVALANCHES ARE LIKELY. AVOID BEING ON OR BENEATH STEEP MOUNTAIN TERRAIN. AN ELEVATED AVALANCHE DANGER WILL PERSIST THROUGH THE MLK HOLIDAY WEEKEND.
Listen to the first full length episode of the UAC Podcast. Breaking the Stigma with Traumatic Stress - Another Conversation with Dave Richards. Download it on iTunes, Stitcher or from the UAC Blog.
It's worth reading the avalanche accident report from near Silverton Colorado from Jan 5, 2018. Many interesting take home points. INFO
Check out the improved weather links, road conditions, and weather links for each forecast region on the new UAC IOS App. Do you use the NOAA point forecast? If so, now you can bookmark your favorite weather locations in "My Weather" in the App. INFO
The Wasatch Range experienced at least two natural avalanche cycles yesterday with avalanche control teams having excellent results in the field. In the backcountry, at least one large avalanche roared down Slide Canyon (south end of Timpanogos). from avalanche control work from UDOT. It brought debris across all 4 lanes of highway 189 30' deep by 200-300 yards wide. Another natural observed in the morning on the west side of the Cascade ridge with other large naturals noted on the south end of Timp. (Likely large naturals in many areas.) Snowmobilers remotely triggered at least one slab avalanche in Snake Creek 16" deep and 175' wide on a northeast facing gladed slope at 8500'. INFO. pc: Fox news, Arash, Porter
Just like the old days. Rough storm totals are 2' with 2.44" snow-water-equivalent. 48 hour SWE is reported to be 3.12-3.62"! Temps are in the 20s. Winds are from the northwest blowing 20-25mph with gusts to 40. Total snow stakes are 75-85" in Provo Canyon and 60-70" in American Fork. Snow travel was arduous yesterday as the new heavy dense snow came in on top of Wednesday's lower density powder.
Greg's Most Excellent Week in Review is hot off the presses. INFO
We lost the poet Mary Oliver yesterday. She was one of our greatest treasures.
Doesn't everything die at last, and too soon?
Tell me, what is it you plan to do
with your one wild and precious life?
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.
