THIS AVALANCHE ADVISORY EXPIRED ON February 23, 2017 @ 6:54 am
Avalanche Advisory published on February 22, 2017 @ 6:54 am
Issued by George Halcom - Payette Avalanche Center
bottom line

The avalanche danger is CONSIDERABLE above 7,000 feet. Snow and strong winds have created slabs in exposed and sheltered terrain on multiple aspects. Multiple generations of wind slabs may be sensitive to the weight of skiers and riders, may be up to 3’ thick, and have formed on top of a variety of surfaces.  Below 7,000 feet the avalanche danger is MODERATE.

How to read the advisory


  • Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative decision-making essential.
Avalanche Problem 1: Wind Slab
  • Character ?
  • Aspect/Elevation ?
  • Likelihood ?
    Certain
    Very Likely
    Likely
    Possible
    Unlikely
  • Size ?
    Historic
    Very Large
    Large
    Small

Winds out of the West-Southwest, along with warmer snow did a good  job yesterday of producing a heavier, slabby layer on the surface of the snow on multiple aspects where the snow was not protected, giving us an upside down layer that is now buried by 4-6 inches of light density snow as the storm cooled down. The winds were very strong yesterday, knocking mature trees over, and producing natural slab avalanches up to 3 feet deep, as seen in the photo above of an avalanche yesterday on Granite Mountain's Baby Face (NNE 7200ft).

 

 

Avalanche Problem 2: Storm Slab
  • Character ?
  • Aspect/Elevation ?
  • Likelihood ?
    Certain
    Very Likely
    Likely
    Possible
    Unlikely
  • Size ?
    Historic
    Very Large
    Large
    Small

 In middle and upper elevations, where the wind did not got a chance to affect the new snow or the snow was too dense (wet), storm slabs will be likely. Be heads up when traveling in/on/above or below steep terrain today. Even a small convex on a slope could cause a storm slab to be triggered. 

 

 

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 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").

 The Friends of the Payette Avalanche Center (FPAC) needs YOU! We are in desperate need of more user support and financial assistance. The avalanche forecast is not a guaranteed service, and is in jeopardy of dwindling down to only a couple of days a week in the near future. Please help if you can by clicking the DONATE tab above. If you value this life saving information, make a donation or help the FPAC in raising funds for the future.

We rely on our snowmobiles to bring you quality forecasts. Currently two of our sleds have nearly 8,000 miles on them. We need your help raising funds for replacements! Please contact us if you can help in any way forecast@payetteavalanche.org or click DONATE tab.

recent observations

Yetserday, 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 have reported triggering similar slides.

Monday we got a report of a natural wind slab avalanche on the Brundage ridge line just out of bounds from the ski area on a west aspect at 7,200 feet. We don't know much, however, we do know that it was approx. 200 feet wide with a crown depth of approx. 20 inches.

Sunday we had a report from local guides of natural storm slab avalanches on northwest aspects at around 7,000 feet on 'Double North'. These avalanches were failing on 38 degree slopes and ran 150 feet with a crown of approx. 1 foot. On Slab Butte the guides were able to get slabs to release 10-12 inches deep on steep roll overs with ski cuts on west aspects.

Natural avalanches are the #1 RED FLAG for dangerous avalanche conditions. 

CURRENT CONDITIONS Today's Weather Observations From the Granite Weather Station at 7700 ft.:
0600 temperature: 27 deg. F.
Max. temperature in the last 24 hours: 30 deg. F.
Average wind direction during the last 24 hours: west-southwest
Average wind speed during the last 24 hours: 8 mph
Maximum wind gust in the last 24 hours: 38 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.