THIS AVALANCHE ADVISORY EXPIRED ON March 24, 2017 @ 6:30 am
Avalanche Advisory published on March 23, 2017 @ 6:30 am
Issued by George Halcom - Payette Avalanche Center
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The Avalanche Danger will rise to Moderate today as the Sun heats up the snow surface.  Human triggered loose, wet avalanches remain possible on all steep solar slopes. On Southern and Northern slopes in the highest elevations, you may encounter shallow wind slabs that may be reactive to the weight of a skier or snowmobile. 

How to read the advisory


  • Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
Avalanche Problem 1: Loose Wet
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Last night the mountains got a solid freeze, with some help from the North winds. The Sun is forecasted to come out in force today, which will put smiles on many peoples faces, except the snow pack, which will likely shed snow in the form of loose-wet avalanches. Be cautious throughout the day as the hazard climbs with the temperature, especially on lower elevation SE, S,SW, and W slopes where the sun heats up the snow surface. If you are seeing natural point releases/ loose snow avalanches, and or roller balls, move to an aspect that is cooler, and not in the direct sunlight.

 

 

 

Avalanche Problem 2: Wind Slab
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With a few inches of new snow in the mountains yesterday, and decent gusts from the Southern end of the compass yesterday, and from the Northern end of the compass last night, you may find some shallow 2-6 inch fresh wind slabs on all aspects in the upper elevations, especially above tree line, that could be sensitive to the weight of  a snowmobile or skier. 

 

 

 

advisory discussion

Snowmobiler/Snowbiker Travel Restrictions: Please respect these closures and other users recreating in them.  Winter Travel Map(East side). You can download the map to the AVENZA app on your phone, and know your exact location while you are out riding.  It is your responsibility to know where closures exist on the forest.

The Granite Mountain Area Closure is in effect Jan15-March 31, please respect Snowcats operating, signed and unsigned closures and other users in this and nearby areas.  In addition there are other areas on the Payette National Forest that are CLOSED to snowmobile traffic including Jughandle Mt east of Jug Meadows, North of Boulder Mtn, East of Rapid Peak, North of the 20 mile drainage, Lick Creek/Lake Fork Drainage (on the right side of the road as you are traveling up canyon), and the area north of Brundage Mt Ski area to junction "V" and along the east side of Brundage and Sergeants' Mts. with the exception of the Lookout Rd( junction "S").  

Ski areas are closed to snowmobile traffic, last week a group of snowmobilers poached the Northern portion of Tamarack Resort crossing under a fixed and signed rope line and left trenches on 3 of the ski runs that don't get groomed. Don't be "that guy" that gives sledders a bad name, please respect boundaries, snowmobiling at a ski resort is a low blow and a safety concern.

recent observations

Yesterday, we toured the Pearl-Burnside area and witnessed the effects of the last rain event. Most of the giant cornices hung on through the rain, but some did not, and large chunks broke off on many Northern aspects along with numerous debris piles from wet-loose point releases. Runnels in the snow surface were almost completely covered up in the upper elevations by the new snow and wind which gave way to some decent riding conditions. The cool down had frozen the upper few inches before covering it up with a fresh 2-5 inch layer of powder. Below the crust the snow is still saturated and soggy.

Above: Loose snow slides above Burnside Lake

Above: Large cornice break on North aspect into the Box drainage...hard to see

CURRENT CONDITIONS Today's Weather Observations From the Granite Weather Station at 7700 ft.:
0600 temperature: 20 deg. F.
Max. temperature in the last 24 hours: 33 deg. F.
Average wind direction during the last 24 hours: N
Average wind speed during the last 24 hours: 10 mph
Maximum wind gust in the last 24 hours: 25 mph
New snowfall in the last 24 hours: NA inches
Total snow depth: NA inches
Disclaimer

This avalanche advisory is provided through a partnership between the Payette National Forest and the Payette Avalanche Center. This advisory covers the West Central Mountains between Hard Butte on the north and Council Mountain on the south. This advisory applies only to backcountry areas outside established ski area boundaries. This advisory describes general avalanche conditions and local variations always occur. This advisory expires at midnight on the posted day unless otherwise noted. The information in this advisory is provided by the USDA Forest Service who is solely responsible for its content.