Winds upwards of 26 MPH from around the Northern end of the compass are taking their turn now over the last 24 hours at pushing, and moving snow which have formed a new crop of wind slabs. Winds out of the West-Southwest, along with colder, then warmer snow did a good this past week of forming a dense slab that was resting on some facets on top of about an inch of snow on top of a rain crust that was the bedsurface for many recent natural avalanches. A heavier, slabby layer formed, and is now lies beneath 6-12 inches of light density snow. The winds were very strong during the last couple days, knocking mature trees over, and producing natural and human triggered slab avalanches up to 3 feet deep in various locations on North Aspects around the advisory area.
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 responsiblity to know where closures exist on the forest.
The Granite Mountain Area Closure is in effect Jan15-March 15, please respect Snowcats operating 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, 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").
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Tuesday, Brundage Catski reported a natural slab avalanche up to 3 feet deep Granite Mountain's Baby Face (NNE 7200ft). Check out the observation in our observations section, where othe skiers and riders have reported triggering similar slides over the last couple of days.
Yesterday, we went out to look at the natural avalanche on Granites Baby Face. The Sun came out briefly and it was very warm, luckily it went away quickly. We found a fairly hard wind slab 3-4 feet deep that released on facets that formed on top an inch or so of denser snow that came in wet and stuck very well to the rain crust that formed. within the 3-4 feet, we found a couple layers in the upper 2 feet that are still working on bonding and are showing some strength. Skiing and snowmobiling was good, and fairly effortless.
Above is a snapshot of the Crown yesterday.
|0600 temperature:||11 deg. F.|
|Max. temperature in the last 24 hours:||25 deg. F.|
|Average wind direction during the last 24 hours:||Northeast|
|Average wind speed during the last 24 hours:||15 mph|
|Maximum wind gust in the last 24 hours:||30 mph|
|New snowfall in the last 24 hours:||NA inches|
|Total snow depth:||NA inches|
TODAY a 40 percent chance of snow showers. Cloudy, with a high near 20. Wind chill values between -5 and 5. Blustery, with a north wind 18 to 21 mph. New snow accumulation of 1 to 2 inches possible.
LONG TERM...Friday night through Wednesday...Cold active weather pattern will continue through Tuesday with the passage of two upper level troughs. Models remain consistent in keeping the first trough on Friday night into Saturday well off the west coast with the forecast area remaining largely unaffected. Showers could develop over the higher terrain Saturday afternoon but snow accumulations will be little if any. This trough weakens as it shifts southeast across California Saturday night. A second stronger and more moisture trough moves along the coast Sunday before shifting inland late Monday into Tuesday. Models still don`t have a great handle on this system and differ with how far south the trough drops Monday before moving inland. This mainly has implications with the extent of shower coverage Sunday afternoon through Monday. Northwesterly flow will continue the changes for snow showers on Tuesday. Snow amounts will be light with a few inches in the mountains to little if any accumulations in the valley as the ground and surface temperatures remain at or above freezing Sunday through Monday. Upper level ridge begins to build along the west coast Wednesday and remaining through the weekend. It`s not particularly strong but it will keep the area dry with temperatures climbing back to seasonal normals by Thursday.
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.