THIS AVALANCHE ADVISORY EXPIRED ON January 6, 2017 @ 6:52 am
Avalanche Advisory published on January 5, 2017 @ 6:52 am
Issued by George Halcom - Payette Avalanche Center
bottom line

The avalanche danger is MODERATE on all slopes over 30 degrees and above 7,000 feet due to human triggered avalanches being possibleBe on the lookout for fresh new wind slabs and older/stiffer wind slabs while traveling in steep, wind drifted slopes, especially those facing the north half of the compass.

Below 7,000 feet, and out of the wind, generally safe avalanche conditions exist and the avalanche danger is LOW

How to read the advisory


  • Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
Avalanche Problem 1: Wind Slab
  • Character ?
  • Aspect/Elevation ?
  • Likelihood ?
    Certain
    Very Likely
    Likely
    Possible
    Unlikely
  • Size ?
    Historic
    Very Large
    Large
    Small

Yesterday, the Northeast winds ruled the upper elevations. You can still find the affects of the wind from the weekend and the end of last week. Most of the wind transported snow has accumulated on the northerly aspects falling on older windslabs. Watch for sculpted or stiff wind board on the windward aspects and rippled, chalky or hollow feeling/sounding pillows and drifts on steep leeward aspects. You should also be aware that some of the older wind slabs may be found well below the ridgelines on leeward terrain. Practice safe travel protocols, and expose only one person at a time in wind loaded avalanche terrain.

advisory discussion

Did you know: Only a small portion of our operating budget comes from the Forest Service, we RELY on the the Friends of  the Payette Avalanche Center to help finance the forecasts that you use and the equipment we use to gather the information.  Our forecast sleds are overdue for replacement and we rely on these as important tools to provide reliable avalanche advisories to the public...don't let your local avalanche center end up with a pile of melted metal, plastic, and rubber on the side of the road! Come out and support your FRIENDS and get involved, or make a tax deductible donation online.

recent observations

No new natural or human caused avalanches have been reported. 

Yesterday we toured the Granite Mountain/ Twin Lakes area and found a strong snowpack on both South and North Aspects. The bitter cold North-east winds were transporting the soft snow on the surface of ridgelines. Coverage was thin, and downright spooky as my travel partner and I uncovered many rocks and logs that were just buried beneth the surface. We also got a report of some of the best coverage/skiing near Big Creeck, but a stout crust is buried 10-20 cm down from the surface that might cause future problems? The Basal facets that lie at the ground seem to be healing/rounding all around the advisory area. 

 

weather

No new snow was picked up overnight. Light to moderate North East winds continued to work over the high country last night and into this morning. Temperatures last night dipped to around -10 degrees in the upper elevations. The sky will be cold, clear, and sunny today with a high temperature of 16 in the upper elevations, and 14 in Long Valley. Tonight we will  see a low of -12 in Long Valley, and -3 in the upper elevations. Saturday the temperatures begin to warm up as our next, and warmest storm seems to hold good amount of precipitation.

 

Two-Day Mountain Weather Forecast Produced in partnership with the NOAA-NWS
McCall Airport at 5021 feet.
  Thursday Thursday Night Friday
Weather: Sunny, with a high near 14. Wind chill values between -11 and -21. Northeast wind around 5 mph becoming calm in the afternoon. Partly cloudy, with a low around -12. Wind chill values between -16 and -21. Light and variable wind. Mostly sunny and cold, with a high near 10. Wind chill values between -13 and -23. South wind 3 to 5 mph.
Temperatures: High 14 deg. F. Low -12 deg. F. High 16 deg. F.
Wind direction: Northeast Variable South
Wind speed: 5 Light 3-5
Expected snowfall: 0 in. 0 in. 0 in.
Granite Mountain at 7700 feet.
  Thursday Thursday Night Friday
Weather: Sunny, with a high near 16. Wind chill values between -9 and -19. Northeast wind 5 to 8 mph becoming calm in the morning. Partly cloudy, with a low around -3. Wind chill values between -9 and -19. Light and variable wind becoming south 5 to 9 mph in the evening. Mostly sunny, with a high near 16. Wind chill values between -9 and -19. South wind around 11 mph.
Temperatures: High 16 deg. F. Low -3 deg. F. High 16 deg. F.
Wind direction: Northeast South South
Wind speed: 5-8 5-9 11
Expected snowfall: 0 in. 0 in. 0 in.
Disclaimer

This avalanche advisory is provided through a partnership between the Payette National Forest and the Friends of 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.