With another windy day in the upper elevations wind slabs are our number one concern. Depending on location, you can find a few different generations of wind slabs that have developed over the last few days. The most suspect slopes today will be the ones with any north facing tilt due to the wind being primarily out of the south throughout this storm and again today. However, yesterday I saw wind loading and slab development on east aspects as well. As usual with wind, it is variable and be on the lookout for clues of wind loading on all slope in the upper elevations.
Winds from Granite Moutain weather station below. Notice gusts mid day yesterday.
Over the last 24 hours we have gotten 2 to 10 inches of snow and today we will see another 3 to 10 inches of snow depending on location and elevations. Totals around the advisory area are nearing 20 inches over the last 48 hours. In areas that were sheltered from the wind expect to find storm slabs again today. These storm slabs will be quite tender and easy to trigger, especially on steep slopes. The bond is getting better between saturday's snow and the crust below, however, the interface between the different storm layers has now become our primary concern with the storm slab problem.
Play it safe today and stick to low angle slopes and meadows and enjoy the powder.
Snowmobiler/Snowbiker Travel Restrictions: 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").
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.
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We had a report from local guides yesterday of natural storm slab avalanches on northwest aspects at around 7,000 feet on Double North. These naturals were failing on 38 degree slopes and ran 150 feet with a crown of appox. 1 foot. On Slab Butte these same guides were able to get slabs to release 10-12 inches deep on steep roll overs with ski cuts on west aspects.
In the southern portion of the advisory area Tamarack Ski Patrol reported very small avalanche activity during morning avalanche mitigation. However, later in the day, wind slabs began to develop on northeast facing terrain due to winds out of the southwest.
*IF YOU GET OUT TODAY, PLEASE LET US KNOW WHAT YOU SEE!
Or use the OBSERVATION tab at the top of this advisory.
|0600 temperature:||25 deg. F.|
|Max. temperature in the last 24 hours:||25 deg. F.|
|Average wind direction during the last 24 hours:||soutwest|
|Average wind speed during the last 24 hours:||4 mph|
|Maximum wind gust in the last 24 hours:||33 mph|
|New snowfall in the last 24 hours:||~3 inches|
|Total snow depth:||NA inches|
Today snow showers. Some thunder is also possible. High near 32. Windy, with a south wind 22 to 30 mph, with gusts as high as 41 mph. Chance of precipitation is 100%. Total daytime snow accumulation of 3 to 7 inches possible.
LONG TERM...Tuesday night through Sunday...Southwest flow aloft Tuesday night with a deepening trough offshore will keep precipitation going across the the region through Wednesday morning. Pattern transitions to a large trough over the Western conus with a large ridge over the Eastern Pacific. This will bring colder-than- normal temperatures into the weekend. Snow levels start Wednesday around 4000 feet MSL, but quickly drop to valley floors by Wednesday afternoon. Weak upper level troughs pass over the region Thursday through Monday and bring a chance for snow showers each day. The showers will be, for the most part, convectively driven favoring the afternoons and early evening time periods. Temperatures will climb above freezing during the daytime, and with ground temperatures above freezing at most lower valley locations (except for the Lower Treasure Valley), impactful accumulations are not expected in the valley. Temperatures stay below normal during the period with the coldest day being Friday.
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.