Bollettino valanghe

Uintas

Utah Avalanche Center
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In sintesi

It's light, it's fluffy, it's epically deep, but this weeks new snow isn't affecting the avalanche danger. Underneath the blower pow, strong snow rests on weak snow... creating deceptively DANGEROUS AVALANCHE CONDITIONS. Today, you'll find CONSIDERABLE avalanche danger on all steep, shady slopes. The danger is most pronounced in terrain facing the north half of the compass in the wind zone at and above treeline. Human triggered avalanches breaking to weak, sugary, midpack snow are LIKELY. Mid elevation slopes on the south half of the compass with similar layering offer MODERATE avalanche danger and human triggered avalanches are POSSIBLE.

Looking for LOW avalanche danger? Well then, simply steer yourself toward low elevation south facing slopes, or head to wind sheltered terrain with no overhead hazard (meaning, no steep slopes above or adjacent to where I'm traveling) is the hot ticket. I've been finding excellent riding conditions and fun meadow skipping on mellow, wind sheltered slopes with no overhead hazard.

Problemi valanghivi

  • Persistent Slabs

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    Probabilità
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    4

    Here's where the rubber meets the road. The biggest clue to avalanches is... avalanches! Mark remotely triggering this piece of snow yesterday confirms all our snowpack suspicions... the fragile, sugary, and persistent weak layer (PWL) in the mid portion of our snowpack is still quite reactive to our additional weight.

    The good, the bad, and the potentially ugly-

    Our recent round of ultra-blower pow isn't going to wake up the avalanche dragon, but pull back the curtain and a more nefarious setup is revealed... and here's what's going on. Last weekends wind formed a dense, strong slab, but that solid layer rests on weaker snow (Persistent Weak Layer or PWL) formed during the mid November dry-spell. Now here's where it gets tricky, this setupgives us a false sense of snow stability, because it feels bomber and good to go underneath our skis, board, or sled. But the fact is, this combo isn't even letting us get onto steep slopes before weak layers fail, allowing avalanches to break remotely and well out in front of us. So yes, I'm thinking not only about the snow I'm riding in, but also the snow I'm riding on. So... any avalanche that fails near the midpack weakness (PWL), is gonna break deep and wide and it's gonna be dangerous.

    Unless you take your shovel out, dig down and investigate a bit, you can easily get lulled into a false sense of snow stability because the snowpack has gained a substantial amount of buoyancy. Yep, that pack's got a whole lotta body... baby :)

  • Wind Slabs

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    • Limite del bosco
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    Probabilità
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    2

    Low density snow is no match for the bump in recent winds, easily whipping up a fresh batch of shallow, yet sensitive drifts along the leeward side of ridges and around terrain features like chutes and gullies.

    But wait, there's more... once initiated, a seemingly harmless shallow drift can get quickly out of hand if it breaks to older, weaker, midpack snow. Found mostly on the leeward side of upper elevation ridges, I'd also be on the look out for drifting around terrain features like chutes and gullies. In either case, you'll wanna look for and avoid any fat looking rounded pillow of snow, especially if it sounds hollow like a drum.

    Hot ticket and where to ride-

    Easily managed and avoided with terrain choices... lose the wind, you lose the problem, and score great riding conditions to boot. Done, done, and done :)

Special Avalanche Bulletin

Dangerous and unusual avalanche conditions will last through the weekend. Heavy snowfall this past week created dangerous avalanche conditions at all elevations. Don’t be lured by the beautiful sunny skies and fresh powder into thinking avalanche conditions are safe... they are not!

Do not travel on, underneath, or adjacent to slopes 30 degrees or steeper on slopes facing northwest, north, northeast, and east where triggering large and dangerous avalanches is likely. This includes low-elevation foothills where avalanches can occur not far from parking areas and trailheads.

Special Announcement

Huge thanks all our local heroes, the hard working gals and guys who have given so much of themselves this week to save the lives of two very lucky backcountry riders. I am honored to know you and we are all grateful for your dedication and service!

We have dodged a few bullets with two close calls in the backcountry Tuesday and Wednesday. One in Pink Pine the other in Neff's Canyon.

Both Mirror Lake Highway and Wolf Creek Pass are closed for the season

Recent Activity

Most likely triggered from a cornice fall, the image above is a very large and connected (3' deep x 1200' wide) natural avalanche that occurred late Thursday on a steep East facing slope in Upper Weber Canyon.

Recent avy activity and a slew of Uinta obs areHERE.

Snow and Weather

Nowcast- Clear skies overnight allowed temperatures to dip into diesel gelling territory, teetering between zero and about -8 in low laying mountain valleys where they register at o'dark thirty this morning. West and northwest winds blow in the 30's near the high peaks. Of course you'll forget about the cold, because the riding and turning conditions are all-time!

Forecast- Look for mostly sunny skies with temperatures warming into the upper teens and low 20's. Along the ridges, northerly winds blow 20 mph with an occasional gust in the 30's near the high peaks. With clear skies in the queue, overnight lows dip into the single digits.

Futurecast- Mostly sunny skies and warming temperatures are on tap for Sunday. There's a hint at a mid week storm, but the jury is still deliberating on timing and strength.

KA-POW!

This weeks storm totals register close to 24" of snow with just about 1.5" of H2O. In other words... over-the-hood and over-the head!

Lots of excellent trip reports and recent obs are found HERE.

Additional Info

And... we were super busy this summer upgrading the western Uinta weather station network and this real-time winter info is found HERE (click weather stations, and then on the Western Uinta tab)

Your observations are important, so please let me know what you're seeing... click HERE and contribute to this amazing community-based program

General Announcements

Issued at 03:48 on Saturday December 17th, this forecast expires 24 hours after the date and time posted, but will be updated by 07:00 Sunday December 18th.

Before it gets too crazy, now is the time to book an avalanche awareness presentation for your group, club, or posse. You can reach Craig directly at 801-231-2170 or [email protected].

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.

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