Salt Lake Avalanche Advisory

Forecaster: Bruce Tremper

SPECIAL ANNOUNCEMENT

We've got two avalanche education events this week – a FREE women's avalanche beacon clinic 9 am Monday morning at Alta, and a FREE avalanche awareness talk at the SL REI on Tuesday at 7 pm. Check out our calendar off the HOME page for more details on all the upcoming events.


BOTTOM LINE

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


Danger Rose Tutorial

Although the snowpack is mostly stable this morning, hazard should increase through the day as snow accumulates, especially in places with recent deposits of wind drifted snow. The danger should rise to MODERATE by this afternoon or evening with both sluffs and soft slabs on the old, slick snow surface. Especially watch for recent wind drifting on steep slopes along the ridge tops.


CURRENT CONDITIONS

We have light snow showers just starting this morning with temperatures in the lower 20's. The old snow conditions are in bad need of some refreshment. The old snow surface is 2-4 inches of light, recrystallized powder on top of a rain crust, which sits on weak, faceted snow. Total snowpack depths are only about 2 feet on the north facing slopes in the Salt Lake area mountains with very little snow on the south facing slopes. Areas outside the Salt lake area mountains only have about a foot of total snow. Check out Doug Wewer's photos from the Ben Lomond area in Ogden. Also check out my YouTube video of field work yesterday in White Pine in Little Cottonwood Canyon.


RECENT ACTIVITY

There was no activity from yesterday reported from either the backcountry or the resorts.


THREAT #1

WHERE PROBABILITY SIZE TREND
      Over the next 24 hours.

With a new storm arriving today, the main problem will be the new snow forming both sluffs and slabs on the old, slick, snow surfaces. The old snow has a skiff of light, recrystallized snow on top of a rain crust with weak faceted snow underneath. So the new snow will likely slide easily on the slick rain crust. In places where the new snow accumulates more than about a foot of snow, especially in wind drifts, the weight could collapse the old snow down into the very weak, faceted snow underneath the rain crust, making larger, more dangerous avalanches. I'm expecting just three inches this morning with a break by mid day and then heavier snow this afternoon and evening, so the hazard should increase throughout the day, especially this afternoon.


MOUNTAIN WEATHER

The storm should bring 6-12 inches of new snow by midnight tonight and it will come in two pieces. We will get about 3 inches this morning as the front arrives, then a break for a sucker hole in the middle of the day, with a cold pocket of unstable air arriving this afternoon and evening. Ridge top winds will blow 15-20 from the northwest with ridge top temperatures will drop from the mid 20's to around 9 degrees overnight. Ridge top winds should turn northerly tonight, which should cut off most precipitation except for the Oquirrh Mountains.

Tuesday and Wednesday should be partly cloudy and cold and we have a rest period for the rest of the week. But the big news is that the longer range models continue to insist that we will have a major change in the pattern with a potentially significant snow storm for next weekend.


GENERAL ANNOUNCEMENTS

If you want to get this avalanche advisory e-mailed to you daily click HERE.

For the TEXT-only advisory, click here.

UDOT highway avalanche control work info can be found by calling (801) 975-4838. Our statewide toll free line is 1-888-999-4019 (early morning, option 8).

The UAC depends on contributions from users like you to support our work. To find out more about how you can support our efforts to continue providing the avalanche forecasting and education that you expect please visitour Friends page.

If you’re getting out and see anything we should know about please let us know. You can leave a message at (801) 524-5304 or 1-800-662-4140, or email us at uac@utahavalanchecenter.org. (Fax 801-524-6301).

The information in this advisory is from the U.S. Forest Service, which is solely responsible for its content. This advisory describes general avalanche conditions and local variations always occur.

Drew Hardesty will update this forecast by 7:30 on Tuesday morning.


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.