THIS AVALANCHE ADVISORY EXPIRED ON February 28, 2016 @ 7:12 am
Avalanche Advisory published on February 27, 2016 @ 7:12 am
Issued by George Halcom - Payette Avalanche Center
bottom line

The avalanche danger is MODERATE  above 6,000 feet today. Rain up to 7,000 feet last night, and above freezing temperatures give us the possibility of loose/wet avalanches. Fresh wind slabs will from in the wake of new snow and wind. Terrain below 6, 000 feet will have LOW danger 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: Loose Wet
  • Character ?
  • Aspect/Elevation ?
  • Likelihood ?
    Certain
    Very Likely
    Likely
    Possible
    Unlikely
  • Size ?
    Historic
    Very Large
    Large
    Small

Temperatures in the upper elevations have been above freezing for more than 24 hours, and rain has fallen all the way up to 7,000 feet. Wet, loose activity in the form of rollerballs and point releases are possible, and so are human triggered wet, loose slides in terrain steeper than 35 degrees. The snow surface should adjust, and stabilize some as temperatures cool down this evening.

 

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

Fresh wind slabs will form today, and this evening as we recieve 2-4 inches of snow along with moderate winds out of the West-Southwest. Fresh slabs will form on NW, N, NE, and East aspects. Watch for signs of sculpting on the snow surface, hollow or drummy feel, or stiffer snow. Tonight the winds will gust around 32 Mph which will do a great job adding to our wind slab problem.

advisory discussion

Ladies, Don't forget about our Diva Avalanche Class this weekend at Tamarack Resort.  Show up early for yoga and coffee or come just for the class. Stay late for Happy Hour at Seven Devils Pub! Suggested donation of $10 for the Friends of the Payette Avalanche Center.

For more information or to RSVP email: hthiry@tamarackidaho.com

recent observations

Based on our stability tests, and lack of recent avalanche activity on our buried surface hoar (about 110 CM deep), we are phasing the deep slab/persistent weak layer problem out of the advisory for now.  If (or when) temperatures allow melting water to percolate through the snowpack we could see this particular boogeyman make another visit to the West Central Mountains.  Keep this layer in mind if you are skiing or riding on protected northerly slopes with a steep, shallow snowpack because you could still be unlucky enough to find a trigger point for a large and unsurvivable avalanche. 

weather

Today snow levels are dropping back down to around 5500 feet, and we will see 2-4 inches of snow with moderate winds out of the West-Southwest...winds will gust around 32 Mph tonight in the upper elevations.

 

 

Two-Day Mountain Weather Forecast Produced in partnership with the NOAA-NWS
McCall Airport at 5021 feet.
  Saturday Saturday Night Sunday
Weather: Rain showers before 11am, then rain and snow showers likely. Some thunder is also possible. High near 40. West southwest wind around 6 mph. Chance of precipitation is 100%. Little or no snow accumulation expected. Mostly cloudy, with a low around 23. South southwest wind 5 to 8 mph becoming light and variable in the evening. A chance of snow showers before 11am, then a chance of rain showers. Cloudy, with a high near 42. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 40%. New snow accumulation of less than a half inch possible.
Temperatures: High 40 deg. F. Low 23 deg. F. High 42 deg. F.
Wind direction: West-Southwest South-Southwest South
Wind speed: 6 Mph 5-8 Mph 6 Mph
Expected snowfall: 0 in. 0 in. less than one half in.
Granite Mountain at 7700 feet.
  Saturday Saturday Night Sunday
Weather: Snow showers. High near 38. West southwest wind 14 to 16 mph. Chance of precipitation is 100%. Total daytime snow accumulation of 2 to 4 inches possible. Mostly cloudy, with a low around 26. West southwest wind 5 to 11 mph. A 40 percent chance of snow showers. Cloudy, with a high near 38. Breezy, with a south southwest wind 16 to 22 mph, with gusts as high as 32 mph. New snow accumulation of less than one inch possible.
Temperatures: High 38 deg. F. Low 26 deg. F. High 38 deg. F.
Wind direction: West-Southwest West-southwest South-southwest
Wind speed: 14-16 Mph 5-11 Mph 16-22 Mph gusting to 32Mph
Expected snowfall: 2-4 in. 0 in. less than one 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.