THIS AVALANCHE ADVISORY EXPIRED ON December 28, 2015 @ 7:16 am
Avalanche Advisory published on December 27, 2015 @ 7:16 am
Issued by Dave Bingaman - Payette Avalanche Center
bottom line

The Avalanche Hazard is Low except in upper elevation terrain near ridgetops and in other terrain features that caught last week's blowing snow. You may still encounter sensitive wind slabs from last week's high winds in these areas. On steep terrain sluffs or loose dry avalanches will  also be a concern today.

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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We have been talking about wind slabs most of the winter so far.  Wind slabs are still lingering in the upper elevation areas near ridge tops and in a few pockets where the blowing snow can accumulate.  Most of these areas are going to be pretty obvious as a density change or an area of stiffer snow in the otherwise soft snow around them. Look for them below cornices and in natural catcher's mitts like gullies or small depressions on the slope. Look for increasing hazard in these areas as S and SW winds increase tonight. Gusts will increase into the high 20's which will be able to transport any remaining soft snow near the ridgetops.

Avalanche Problem 2: Loose Dry
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Small loose, dry avalanches or sluffs should be anticipated on large steep, steep confined slopes or on slopes with obstacles below your intended line. These small slides don't pack a lot of punch but can grab you and push you in a direction you don't want to go whether you are on a sled or skis. 

recent observations

The sun was out yesterday and the backcountry was a busy place.  We toured out the ridge from Brundage Mt yesterday and found a lot of folks recreating.  The snowpack continues to stabilize and the remaining wind slabs are much less sensitive than they were a few days ago.  Ski cuts and Mitt pits on steeper terrain show the same 2 feet of unconsolidated snow resting on a mostly supportive base of snow down to the ice crust near the bottom of our snowpack. Watching folks ride, slide and fall off the steeper NW terrain adjacent to the resort provided some good visual stability clues as well.  Small, shallow sluffs continue to be an issue in the steeper terrain but the snowpack is adjusting to last week's snow really well in the areas we have been traveling.

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

Look for mostly cloudy skies today with a slight chance of  measurable snow tonight. Temperatures today will be close to 22 degrees in the mountains with the temperature inversion in the valleys holding strong. Wind chills in the mountains today will be in the single digits.  A chance of snow will remain in the forecast for the next few days as a weak trough of moisture passes through the PAC advisory area.

Two-Day Mountain Weather Forecast Produced in partnership with the NOAA-NWS
McCall Airport at 5021 feet.
  Sunday Sunday Night Monday
Weather: Patchy fog before noon. Otherwise, partly sunny. Mostly cloudy Cloudy with a 20 percent chance of snow showers.
Temperatures: 17 deg. F. 6 deg. F. 21 deg. F.
Wind direction: S SE NW
Wind speed: 0-5 light 0-6
Expected snowfall: 0 in. 0 in. 0 in.
Granite Mountain at 7700 feet.
  Sunday Sunday Night Monday
Weather: Mostly cloudy. Wind chill values between zero and 8. A 20 percent chance of snow showers after 11pm. Mostly cloudy. Cloudy with a 30 percent chance of snow showers.
Temperatures: 22 deg. F. 10 deg. F. 22 deg. F.
Wind direction: S/ SW S/SW SW becoming N/NW in the afternoon.
Wind speed: 16-18 11 to 17 mph, with gusts as high as 26 mph. 8-11
Expected snowfall: 0 in. Trace in. less than 1 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.