THIS AVALANCHE ADVISORY EXPIRED ON January 3, 2017 @ 5:58 am
Avalanche Advisory published on January 2, 2017 @ 5:58 am
Issued by -
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

South, southwest, and southeast winds over the last few days have added a new round of thin wind slabs in the upper elevations. Most of the wind transported snow has accumulated on the northerly aspects falling on older windslabs that were formed earlier last week. Some of these older windslabs ran naturally on Tuesday and were able to "step down" into deeper layers below. 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 due to the moderate to high winds last week, 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

Friends of the Payette Avalanche Center needs YOU! Come join us on Tuesday January 3rd at Idaho First Bank in McCall at 6 pm for an annual membership meeting. This meeting is open to the entire snow loving community,  and we need to hear from you on how the Payette Avalanche Center should grow into the future.

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 Tuesday night or make a tax deductible donation online.

recent observations

No new human or natural avalanches have been seen or reported over the last 24 hours. Observations from the weekend were of a fairly stable snowpack, other than some wind slab activity on north facing terrain. 

weather

Low of 10 degrees overnight. Light winds out of the south southeast. 1 to 3 inches new very low density snow around the advisory area. The high today will be between 11 and 15 degrees in the mountains, with winds 8 to 10 out of the south. Chance of 1 to 2 inches additional snowfall through the day. Expect scattered snow showers on and off all week accompanied by cold temps. Early next week looks to be next round of considerable precipitation with a deep upper level trough coming to our region with warmer temps. 

Two-Day Mountain Weather Forecast Produced in partnership with the NOAA-NWS
McCall Airport at 5021 feet.
  Monday Monday Night Tuesday
Weather: Scattered snow showers. Cloudy, with a high near 17. Calm wind. Chance of precipitation is 50%. New snow accumulation of around an inch possible. A 30 percent chance of snow showers. Cloudy, with a low around 2. Calm wind. New snow accumulation of less than one inch possible. A 30 percent chance of snow showers, mainly before 11am. Cloudy, with a high near 17. Light and variable wind. New snow accumulation of less than a half inch possible.
Temperatures: High 17 deg. F. Low 2 deg. F. High 17 deg. F.
Wind direction: Variable
Wind speed: Calm Calm Light
Expected snowfall: 1 in. less than 1 in. Less than .5 in.
Granite Mountain at 7700 feet.
  Monday Monday Night Tuesday
Weather: Snow showers likely. Cloudy, with a high near 11. Wind chill values between -1 and -9. South wind around 10 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible. A 30 percent chance of snow showers. Cloudy, with a low around 2. Wind chill values between -5 and -12. South wind around 9 mph. New snow accumulation of less than one inch possible. A 30 percent chance of snow showers, mainly before 11am. Cloudy, with a high near 12. Wind chill values between -6 and zero. Southwest wind 7 to 9 mph. New snow accumulation of less than one inch possible.
Temperatures: High 11 deg. F. Low 2 deg. F. High 12 deg. F.
Wind direction: South South Southwest
Wind speed: 10 9 7 to 9
Expected snowfall: 1 to 2 in. Less than 1 in. Less than 1 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.