Avalanche Advisory
Advisory: Ogden Area Mountains Issued by Drew Hardesty for Monday - January 25, 2016 - 7:17am
bottom line

We have a Considerable danger in the backcountry right now. Human triggered sluffs and wind drifts are likely in steep terrain today. It is still possible to trigger avalanches 2-3' deep into older faceted snow on a variety of aspects. If we get more sun and heating that expected, the new snow may become more active in the steepest sun-kissed terrain.

The snowpack is complicated right now. When I find that things start getting complicated, it's time to step back toward simplicity: slope angle and proper terrain analysis. Give yourself a good margin for error.




special announcement

There are still spaces in the Women’s Backcountry 101 avalanche class at Brighton (Feb 4/6) and the Women’s Snowbasin Avalanche Awareness class Feb (18/20). For more info on those classes and other education offerings through out the state, check out our Education Page.

current conditions

Snow. The Ogden mountains picked up another inch or two overnight, pushing storm totals since later Saturday to about a foot or so.

Mountain temperatures are in the teens up high, 20F at 8000'. Don't let the light northerly winds this morning fool you - the northwesterlies blew 20-25mph at many locations for yesterday with mid-elevation anemometers showing gusty wind as well.

recent activity

Increasing winds yesterday stiffened up some of the new snow and fresh wind drifts moved with explosives and intentional ski cuts through the afternoon. (Photo: Wilson). Loose snow slides were common in the morning; some wind drifts were triggered on approach.

And another thing - the US is up to 14 fatalities for the season, with 9 avalanche related deaths in the last 9 days alone. Some of these incident have been with very experienced backcountry folks. Something else that comes to mind when looking at the most recent 4 incidents below: in each of them, more than one person was caught and carried in the slide. The take-home here is to assess the terrain and put only one person on the slope - or even runout zones - at a time.

2015-2016
TOTAL FATALITIES: 14

DATE PLACE FATALITIES STATE ACTIVITY SUMMARY
2016-01-24 Jackson Hole, Rock Springs, Ralphs Slide (outside ski area) 2 WY SKI 2 out-of-area skiers killed
2016-01-23 Olney, Whitefish Range, Swede Creek 1 MT SNOWMOBILE 3 snowmobilers caught, 2 partly buried, 2 buried and 1 killed
2016-01-21 Crested Butte, Kebler Pass, Ruby Bowl 1 CO SNOWMOBILE 2 snowmobilers caught, 1 buried and 1 killed
2016-01-21 Big Cottonwood Canyon, Gobblers Knob, Whitesnake 1 UT SKI 2 backcountry skiers caught, 1 partly buried, 1 buried and killed
2016-01-19 Yellowstone Club (outside of ski area), Cedar Basin 1 MT SKI 1 ski patroller caught, partly buried and killed
2016-01-19 Jackson, Jensen Canyon, Pyramid Peak 1 WY SNOWBOARD 1 backcountry snowboarder caught, buried and killed
2016-01-16 Hatcher Pass, Skyscraper Mountain 1 AK SNOWBOARD 1 backcountry snowboarder caught, buried and killed
2016-01-16 Front Range, St. Marys Lake 1 CO CLIMB 1 climber caught, buried and killed
2016-01-02 Hatcher Pass, West side, Craigie Creek 1 AK SNOWMOBILE 1 snowmobiler caught, buried and killed
2015-12-31 Snoqualmie Pass, Granite Mountain 1 WA SNOWSHOE 1 snowshoer caught and killed
2015-12-19 Cooke City, Beartooth Mountains, Sheep Mountain 1 MT SNOWMOBILE 3 snowmobilers caught, 2 partly buried, 2 buried and 1 killed
2015-11-22 Hatcher Pass 1 AK SKI 1 backcountry skier presumed caught, buried and killed
2015-11-10 Inyo County, John Muir Wilderness, Meysan Lake, Mt. Mallory 1 CA CLIMB 1 climber caught, buried and killed

Airbags? My email to a guy asking about the full burial with airbag on the Gobbler's incident from Thursday -

  • Erik - there was no stauchwall on the fatal avalanche on Gobbler's and this explains why the debris field was enormous. The gal buried w an airbag a couple years ago in Grizzly Gulch was buried a couple feet down in a very deep debris pile in the terrain trap. My guess is that w/o the airbags, each of them would have been buried much more deeply and it's possible that we would now have two fatalities with these events instead of one. Nonetheless, airbags help with the asphyxia problem, not trauma. The take home is that the airbag stacks a couple extra points in your favor only if the terrain below is favorable. Safety airbags in a head-on with a Mack truck don't help so much.

Avalanche Problem 1
type aspect/elevation characteristics
LIKELIHOOD
LIKELY
UNLIKELY
SIZE
LARGE
SMALL
TREND
INCREASING DANGER
SAME
DECREASING DANGER
over the next 24 hours
description

I suspect by now, these drifts may be up to 2' deep and can pack a punch. It may be that one could get some of the blower powder moving as a sluff only to have it prod the overnight whales into moving as well. Ski cuts and cornice drops should give good indication of localized stability... but remember that these aren't for the faint of heart and can be at times dangerous at best. Click on the 'i' for more info on Wind Slabs.

Avalanche Problem 2
type aspect/elevation characteristics
LIKELIHOOD
LIKELY
UNLIKELY
SIZE
LARGE
SMALL
TREND
INCREASING DANGER
SAME
DECREASING DANGER
over the next 24 hours
description

Sluffs typically take a steeper slope angle to get moving (approaching 40° in steepness) and can certainly pack a punch in steep sustained terrain. In terrain like this, it'll be key to stay on sub-ridges and spines, or move diagonally across the fall line to avoid being taken out by your own sluff. By nature, they don't propagate laterally with initiation but they can sure reach what long-time avalanche worker Dave Medara calls "hovercraft mode". You'll know it when you see it. Click on the 'i' for more info on Loose Dry Snow (sluffs aka point releases).

Avalanche Problem 3
type aspect/elevation characteristics
LIKELIHOOD
LIKELY
UNLIKELY
SIZE
LARGE
SMALL
TREND
INCREASING DANGER
SAME
DECREASING DANGER
over the next 24 hours
description

I gotta tell you - the snowpack is as complicated and complex as I've seen in a few years. Repeater avalanches. Persistent slab avalanches on southerly aspects. Persistent slabs down to 8500'. Doing the work and pulling out the shovel is key in assessing the snow structure - but how to get out into repeater terrain without putting oneself at risk? Rope? Click on the 'i' for more info on Persistent Slabs.

weather

We should be able to squeeze a few more instability flakes of snow out of the departing storm and transition toward mostly cloudy to partly cloudy skies. Temperatures should remain cold - we're looking at the low teens at 10,000', the low 20s at 8000'. Winds should remain light (10-15mph) from the north-northwest. Ridging will move in this afternoon through early Friday. Winds should remain generally light from the northwest over the next few days as 10,000' temps rise toward freezing by Wednesday. Models bring another series of storms through by late Friday.

general announcements

Remember your information can save lives. If you see anything we should know about, please participate in the creation of our own community avalanche advisory by submitting snow and avalanche conditions. You can also call us at 801-524-5304, email by clicking HERE, or include #utavy in your tweet or Instagram.

To get help in an emergency (to launch a rescue) in the Wasatch, call 911.  Be prepared to give your GPS coordinates or the run name. Dispatchers have a copy of the Wasatch Backcountry Ski map.

Backcountry Emergencies. It outlines your step-by-step method in the event of a winter backcountry incident.

If you trigger an avalanche in the backcountry, but no one is hurt and you do not need assistance, please notify the nearest ski area dispatch to avoid a needless response by rescue teams. Thanks.

Salt Lake and Park City – Alta Central (801-742-2033), Canyons Resort/PCMR Dispatch (435)615-1911

Snowbasin Resort Dispatch (801-620-1017), Powder Mountain Dispatch (801-745-3772 x 123).

Sundance Dispatch (801-223-4150)

EMAIL ADVISORY  If you would like to get the daily advisory by email you will need to subscribe here.​ 

DAWN PATROL Hotline updated daily by 5-530am - 888-999-4019 option 8.

Twitter Updates for your mobile phone - DETAILS

UDOT canyon closures:  LINK TO UDOT, or on Twitter, follow @UDOTavy, @CanyonAlerts or @AltaCentral

Utah Avalanche Center mobile app - Get your advisory on your iPhone along with great navigation and rescue tools.

Powderbird Helicopter Skiing - Blog/itinerary for the day

Lost or Found something in the backcountry? - http://nolofo.com/

Ski Utah mobile snow updates

To those skinning uphill at resorts:  it is your responsibility to know the resort policy on uphill travel.  You can see the uphill travel policy for each resort here. IMPORTANT: Before skinning or hiking at a resort under new snow conditions, check in with Ski Patrol.  Resorts can restrict or cut off access if incompatible with control and grooming operations.

Benefit the Utah Avalanche Center when you shop from Backcountry.com or REI:  Click this link for Backcountry.com or this link to REI, shop, and they will donate a percent of your purchase price to the UAC.  Both offer free shipping (with some conditions) so this costs you nothing!

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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 exist.