Lawinenlagebericht

Uintas

Utah Avalanche Center
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Lawinengefahr

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  • Waldgrenze
  • Unterhalb der Waldgrenze
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Veraltet — dieser Lagebericht ist 8 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

In the wind zone, at and above treeline, the avalanche danger is HIGH. Human triggered avalanches are LIKELY on all steep wind drifted slopes, especially those facing the north half of the compass. Any avalanche that breaks into deeper buried weak layers near the ground will result in a very scary, dangerous, and quite possibly unsurvivable avalanche.

You'll find CONSIDERABLE avalanche danger on steep, mid elevation, wind drifted slopes and human triggered avalanches are PROBABLE.

Our trailheads, foothills, and even our own backyards now have a winter snowpack and a MODERATE avalanche danger exists. Human triggered avalanches are POSSIBLE, especially on steep, wind drifted slopes at lower elevations.

Of course you wanna ride, so here's your exit strategy. Swing around to sunny slopes or choose gentle terrain or even big, open meadows with no steep terrain above, adjacent, or connected to where you're traveling. In other words.... simply stay off of and out from under steep, wind drifted slopes.

Lawinenprobleme

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    4

    The good news is... the snowpack is slowly adjusting to last weeks big snow, big water, and days of relentless southerly winds.

    The bad news is... the snowpack has a much better memory of the these events than we do. Let's face it, the pack is in its adolescent growing years, it's getting comfortable in it's own skin, and it still has a few issues it's sorting through.

    But, here's what I know-

    First- 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.

    Second- we have persistent weaknesses buried deep in the snowpack and they're slow to heal. This is the type of structure that 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.

    Third- steep, wind drifted terrain that didn't slide during last weeks big storm is particularly problematic, because today's avalanches could still potentially be triggered mid slope, low on the slope, or from a distance. All we need to do is collapse the slope (whoomph), and now we're staring down the barrel of a dangerous avalanche.

    So how do we manage an adolescent snowpack you're wondering? Well, since it's sorta complicated and hard to understand, why not just avoid making it angry? Patience and avoidance.... that's the ticket! In the long run, it's a patience game and eventually we'll turn the corner towards a more stable snowpack.... give it time. In the short term, if we simply avoid steep, upper elevation wind drifted terrain, we can still have a blast and "high five" each other at the trailhead at the end of the day.

    I'm gonna keep JG's sage advice as a "sticky" because it's spot on!

    "You really get a false sense of security when you are walking, skiing or sledding on such a supportable snowpack. Based on recent avalanches, what I have been seeing in my travels and what I have been seeing in my snowpits I don't think we are close to being out of the water. It's hard to not want to jump into steep terrain when there aren't a lot of visual signs to make you take a step back. Dig in the snow and see for yourself. Just read about the recent tragedies and close calls, it's sobering. Low angle is plenty fun right now, have fun and live another day. The forecast has been spot on, heed the warnings, the Uintas are sketchy right now. "

  • Wind Slabs

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    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    2

    Don't let the light density, surface snow fool you into thinking that's all you're dealing with. Southerly winds blew for days prior to Friday nights light density blower pow, building layer, after layer, after layer of wind drifted snow. Now our wind slabs involve multiple storms, so they're more connected, and may break deeper than we might anticipate. While most prevalent on the leeward side of mid and upper elevation ridges, drifting also occurred around terrain features like chutes, gullies, and sub-ridges. In addition, recent winds cranked even down low near the trailheads, so expect to find fresh drifts in unusually low elevation terrain. 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.

    In addition, winds have been busy at work not only forming thick wind drifts, but also creating large cornice that may break back further than you might expect. A beautiful image above by Michael J who was in Weber Canyon and submitted a great trip report found here.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1

    In addition to Friday nights storm, dense, heavy snow from earlier in the week stacked up at lower elevations making the steep slopes above our mountain communities suspect. If you're going for a snowshoe, trail-run, family outing, or dog walk you'll want to steer clear of steep, snow covered slopes and avoid terrain traps like gullies and road cuts where even a small slide can pile up big piles of cement-like debris.

Additional Info

A broad trough slowly pivots across Utah Sunday and Monday bringing, partly cloudy skies, and scattered snow showers each day. Today's high reach into the mid 20's with overnight lows in the single digits. Winds remain light, blowing less than 20 mph along the the ridges.

Special Announcement

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 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.

Recent Activity

This past week saw multiple avalanches, close calls, and unfortunately an avalanche accident.

Below is a massive naturally triggered avalanche in Upper Weber Canyon that ran sometime very early Friday morning. 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, last Saturday's tragic avalanche accident 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.

Snow and Weather

Skies are overcast, temperatures hover near zero, and a scattered snow shower or two lingers over the region. Winds are quite calm, blowing from the southwest and clocking in at just 10-20 mph along the high ridges.

We've had a good run with the recent series of storms... the snowpack is deep, the range is white and fat, and riding conditions are about as good as they get.

Above is hourly data from Trial Lake (9,945') and Windy Peak (10,662'). To view more regional weather stations click here.

With so much snow and water, we're experiencing some of the best riding conditions in a couple years and there's plenty of safe, low angle options where you can have a blast.

General Announcements

The information in this advisory expires 24 hours after the date and time posted, but will be updated by 7:00 AM Monday February 18th, 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.

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