Logan Avalanche Advisory

Forecaster: Toby Weed

BOTTOM LINE

Danger by aspect and elevation on slopes approaching 35° or steeper.
(click HERE for tomorrow's danger rating)


Danger Rose Tutorial

Heavy snowfall and strong winds over the weekend created dangerous avalanche conditions at upper elevations and there is a level 3 or Considerable danger on drifted slopes with preexisting snow...Human triggered persistent slab avalanches are likely today above around 8000' in elevation on slopes facing the northern half of the compass. Wind slab avalanches are also likely in exposed terrain. Careful snowpack evaluation, cautious route finding, and conservative decision making will be crucial in the backcountry today....


CURRENT CONDITIONS

Upper elevation slopes picked up a couple feet of heavy new snow over the weekend, and sustained strong winds built deep unstable drifts on very weak preexisting snow.... The storm caused dangerous avalanche conditions on north facing slopes above around 8000' in elevation, and the persistent nature of the weak underlying snow will prevent conditions from becoming much more stable any time soon... The Tony Grove Snotel reports 24 inches of total snow on the ground, with a gain of 3.1 inches of water equivalent in the last two days....

Remember that the Tony Grove Road is not maintained for wheeled vehicles in the winter.... Snowmobiles, 4x4s, and pedestrians will all have to share the road, so keep your speed down and be respectful of other users....


RECENT ACTIVITY

Sadly, a snowboarder was killed yesterday by an avalanche he triggered in Little Cottonwood Canyon in the mountains above Salt Lake City...Here is a Preliminary Report. Brett Kobernik and Drew Hardesty from the Utah Avalanche Center plan to head to the accident site today for the full investigation. Several other people were caught and carried by avalanches in the surrounding area yesterday, and more than a dozen unintentionally triggered avalanches were reported to the Utah Avalanche Center.

Locally, we've received several reports of unstable snow and dangerous avalanche conditions from the Tony Grove Lake Area from over the weekend. Natural and remote triggered avalanches as well as extensive collapsing and cracking kept most parties in lower angle terrain, and no accidents were reported...


THREAT #1

WHERE PROBABILITY SIZE TREND
      Over the next 24 hours.

With over 3 inches of water in well over 2 feet of new snow and sustained and gusty winds from the south and west, a significant slab built on weak faceted or sugary preexisting snow... Dangerous avalanche conditions can be found on any steep slope that was snow covered last week, mostly on north facing slopes above around 8000' in elevation. Pay attention to obvious signs of instability like collapsing and cracking and avoid steep drifted terrain....


THREAT #2

WHERE PROBABILITY SIZE TREND
      Over the next 24 hours.

Strong and gusty winds formed significant fresh drifts in exposed terrain.... Sensitive wind drifts will be found on the lee sides of ridges, in scoops, near cliff bands, and in gullies... Wind slabs may fail on density changes within the new snow or right at the old snow surface, and they could be several feet deep. Avoid smooth rounded or chalky looking drifts on steep slopes, and be wary of areas with wind stiffened or deposited surface snow.


MOUNTAIN WEATHER

It'll be mostly cloudy and breezy in the mountains today, with temperatures dropping into the mid twenties this afternoon... West winds will continue tonight and a little snowfall may occur. A couple inches may accumulate tomorrow and west winds will continue. We may see a bit of sunshine and get a little break on Wednesday, but more snow is likely toward the end of the week.....


GENERAL ANNOUNCEMENTS

Please join the Friends of the Utah Avalanche Center in Logan for our annual "Pray for Snow" Fundraiser and Party on Wednesday November 30th at the Italian Place in downtown Logan. The event will feature a silent auction, raffle, great food, music, and a special presentation by Bruce Tremper, the Director of the Utah Avalanche Center.

Please call 757-2794 for more info.

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.


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.


This advisory provided by the USDA Forest Service, in partnership with:

The Friends of the Utah Avalanche Center, Utah Division of State Parks and Recreation, Utah Division of Emergency Management, Salt Lake County, Salt Lake Unified Fire Authority and the friends of the La Sal Avalanche Center. See our Sponsors Page for a complete list.