THIS AVALANCHE ADVISORY EXPIRED ON December 17, 2015 @ 5:51 am
Avalanche Advisory published on December 16, 2015 @ 5:51 am
Issued by Dave Bingaman - Payette Avalanche Center
bottom line

The avalanche hazard is MODERATE today in the mid to upper elevations and LOW below that. The new snow is bonding really well to our old rain crust in most areas. You may still trigger shallow soft slabs at density changes within the top 6-12 inches of the snowpack and isolated wind slabs near ridge tops or in wind exposed terrain. Moderate hazard does not equal green light conditions, evaluate each slope before committing.

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
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You may still find a few sensitive wind slabs near ridge tops or on other exposed terrain.  They are getting covered with a layer of soft snow after the last few days of light accumulations but you should be able to see rounded pillows or drifts in some areas. Pay attention to changing surface conditions as you travel between different aspects.

Avalanche Problem 2: Normal Caution
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Today marks the beginning of the next round of storms.  Pay attention to changing conditions as we recieve additional snowfall and occasionally moderate winds.  Check your gear and keep your eyes on your partners while your enjoy the light and dry!

advisory discussion

Don't forget about our Winter Brain Warm up class this Friday evening at the McCall Ranger District Office. Check out the new Know Before you Go program with PAC forecasters.

recent observations

We toured out from the top of Brundage Mountain Resort yesterday and found plenty of light and fluffy powder.  We saw no signs of recent instabilities and could produce not even minimal activity with a few large cornice bombs.  We did get several reports of triggered and observed avalanche activity from Sunday during the large storm... if you see or trigger avalanche activity please take the time to report it on our Observations page.  The form is easy to fill out and you don't need to fill every box, just give us the info that you have, it helps us paint a better picture of what is happening in our advisory area.

CURRENT CONDITIONS Today's Weather Observations From the Granite Weather Station at 7700 ft.:
0600 temperature: no data deg. F.
Max. temperature in the last 24 hours: deg. F.
Average wind direction during the last 24 hours:
Average wind speed during the last 24 hours: mph
Maximum wind gust in the last 24 hours: mph
New snowfall in the last 24 hours: inches
Total snow depth: inches
weather

 Today will be the first day of storms that will continue through the weekend.  Temperatures will gradually decrease today with the arrival of a cold front which should allow for 2-4 additional inches of cold snow today and again tomorrow. Thursday will bring a chance for another significant precipitation event with snow totals pushing 18 inches in the upper elevations and gradually warming temperatures by the weekend.  Snowlines will be hovering around 5000 ft for the main body of the precipitation on Friday and Saturday.

Two-Day Mountain Weather Forecast Produced in partnership with the NOAA-NWS
McCall Airport at 5021 feet.
  Wednesday Wednesday Night Thursday
Weather: Snow showers. High near 25. Light and variable wind becoming west 8 to 13 mph in the afternoon. Chance of precipitation is 90%. Total daytime snow accumulation of 1 to 3 inches possible. Mostly cloudy, with a low around 2. Wind chill values between -4 and -9. West wind 8 to 13 mph becoming light and variable in the evening. Snow, mainly after 11am. High near 24. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.
Temperatures: 25 deg. F. 2 deg. F. 24 deg. F.
Wind direction: W W SE
Wind speed: 8-13 8-13 5-7
Expected snowfall: 1-3 in. 0 in. 1-3 in.
Granite Mountain at 7700 feet.
  Wednesday Wednesday Night Thursday
Weather: Snow showers. Temperature falling to around 17 by 5pm. Wind chill values between zero and 10. Blustery, with a west northwest wind 8 to 13 mph increasing to 15 to 20 mph in the afternoon. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible. Mostly cloudy, with a low around 8. Wind chill values between -1 and -11. Blustery, with a northwest wind 16 to 21 mph decreasing to 7 to 12 mph after midnight. Snow, mainly after 11am. High near 24. West northwest wind 7 to 16 mph becoming south in the afternoon. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.
Temperatures: 22 deg. F. 8 deg. F. 24 deg. F.
Wind direction: W/NW NW W/NW becoming S
Wind speed: 15-20 7-12 7-16
Expected snowfall: 2-4 in. 0 in. 2-4 in.
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.