US Forest Service Manti-La Sal National Forest

Good morning, this Max Forgensi with the USFS Manti-La Sal Avalanche Center with your avalanche and mountain weather advisory for the Wasatch Plateau/Manti Skyline Region, including, but not limited to Ephraim, Huntington and Fairview Canyons.  This advisory is brought to you through a partnership of Utah State Parks and the USFS.  Today is Sunday, February 25th, 2007 at 8:00 a.m.     

             

If you have been out in the backcountry, please post your OBSERVATIONS with us!

To check out past advisories, go to ARCHIVE. 

To check out the current weather, go to our WEATHER page.  

For more information on snowmobiling on the Skyline, click this LINK

 

  

General Conditions:

            Yesterday was the best riding conditions to date!  You didn’t have to go very far to get a face full of powder.  Areas close to State Highway 31 saw moderate use yesterday.  Snowmobilers were keeping mainly to lower angled terrain and out of trouble.  Warm temperatures from this past week created an inch thick sun crust on South and West aspects before the storm, which lowered the amount of snow available for transport.  By Friday night, cornices generally grew by about a foot and drifts of 4’ of snow could be found on the leeward sides of slopes and ridges.  There are some dangerous conditions still out there today and the following TRAVEL PROTOCOLS should be followed for most users.   Read on to the avalanche conditions for a detailed explanation of what will be more dangerous today. 

Some ways to reduce your risk in being caught in an avalanche is to follow these Travel Protocols: 

1.       Those who do not know the terrain intimately should avoid avalanche terrain and keep to meadows and low angled terrain.  

2.       Steer clear from the run-out zones of avalanche paths.  High benches in alpine bowls could be over-run by large avalanches. 

3.       Do not approach cornices.   Cornices are very tender during or just after a recent storm.  They take up over 24 hours to gain strength. 

4.       Always travel one at a time in avalanche terrain. 

5.       Always carry your beacons, probes and shovels at a minimum. 

 

Mountain Weather: 

Today: A 30 percent chance of snow. Cloudy, with a high near 23. Breezy, with a west wind 10 to 13 mph increasing to between 21 and 24 mph.
Tonight: A 50 percent chance of snow. Cloudy, with a low around 12. Breezy, with a west northwest wind 21 to 24 mph decreasing to between 9 and 12 mph.
Monday: Mostly cloudy, with a high near 28. West wind between 10 and 18 mph.
Monday Night: Increasing clouds, with a low around 20. Southwest wind between 7 and 10 mph.

                                                                                                                                                                                                                                            

Weather Station/ Location

Snow Depth (HS):  in./cm

New Snow (HN) in./cm

7:00 a.m. Temp (F)

Current Observations:  Wind, 48 hour snow

Mammoth/Cottonwood SNOTEL (8,800’):

39”

0”

26

Powder conditions

Seeley Creek SNOTEL (10,000’):

20”

0”

23

Winds from SW @ 10 gust to 19

Skyline Wind Site (SH 31):

~

~

6.8

Poor location for wind out of this direction

Miller Flat Trailhead: 

42”

0”

~

~

 

Avalanche Conditions: (Click here for the International Avalanche Danger Scale)

            5 new avalanches were observed from the highway yesterday, all on North through East aspects.  The biggest avalanche was seen on the Scofield road which was a hard slab 4 feet deep and 1000’ wide on a north aspect at 9,800’.  Areas close to State Highway 31 will have less avalanche danger due to the fact numerous avalanches occurred in these areas, either natural or human triggered within the past week.  The areas of deepest concern are places no one was able to get into last weekend…pretty much any canyon South of Lake.  I have received 4 reports of a human triggered avalanche on the Manti-Skyline in the past week in which people were partially caught and some buried. 

            With the winds picking up from the Southwest this morning, snow will be transporting onto these North-East aspects.  The problem with the bigger alpine bowls is that if your in some of them, your in a run-out zone.  One snowmobiler reported triggering an avalanche at the very bottom of the slope.     

The BOTTOM LINE for the day will be an AVALANCHE DANGER of CONSIDERABLE on any steep slope greater than 35 degrees.  Be especially careful on steep North-East aspects greater than 35 degrees.   This is where the avalanche dragons will be hiding today.