THIS AVALANCHE ADVISORY EXPIRED ON March 1, 2016 @ 6:15 am
Avalanche Advisory published on February 29, 2016 @ 6:15 am
Issued by -
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The avalanche danger for today is LOW, however, areas of MODERATE danger do exist on steep, upper elevation, leeward slopes especially on the north half of the compass due to wind slabs that formed over the weekend.

 

How to read the advisory


  • Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
Avalanche Problem 1: Wind Slab
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  • Likelihood ?
    Certain
    Very Likely
    Likely
    Possible
    Unlikely
  • Size ?
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Wind slabs can still be found in upper elevations on leeward terrain. With not much snow left for transporting, these slabs should be stabilizing and becoming less of a problem. Winds picked up in the afternoon yesterday, and into the evening last night, transporting what snow was left and could make for small shallow fresh wind slabs on east and northeast aspects. Do keep an eye out for signs of freshly drifted snow for the fresh wind slabs, and stiff snow with a chalky surface for the older wind slabs. 

Also, be on the lookout for heavily corniced areas today. We have been seeing some big pieces failing over the past week with the warm temperatures.

The east/northeast face of Bruin Mt. shows some of the crossloading and Mid elevation micro loading that we saw last week.

advisory discussion

We need your observations! If you are getting out in the backcountry, let us know. Use the OBSERVATION tab above, or send us an email at forecast@payetteavalanche.org.

Thanks to all the ladies who came out yesterday for the annual PAC/Tamarack Ski Patrol Women's only Diva Avalanche Awareness Class! The eight women in yesterday's class learned about weather, snowpack, terrain, and the fundamentals of avalanche rescue. Kudos to the participants! 

We don't have any more formal avalanche awareness classes scheduled for the rest of this winter, however, check back next season for a full schedule aimed at all user groups!

recent observations

Yesterday started out cloudy and cool in the high country, with the sun making an appearance sporadically in the afternoon. With limited sun and lower temps the snow surface did not get as soggy as it had in previous days. This combined with last nights freezing temps is good news for our snowpack, making loose wet avalanches less of a threat for today. Do keep in mind that we are still finding buried surface hoar mid-slope on north and northeast aspects. It is proving to not be very reactive, however, if you were to trigger a slide on this layer (100 cm deep) it could be large and potentially fatal.

weather

No new snow overnight, and temps in the high teens to low twenties. Today there is a 30% chance of not much snow...if we do see any white stuff it will scattered and no real accumulation is expected. The sun should make an appearance in the mountains this afternoon, with temps reaching near the freezing mark, and winds out of the west-southwest blowing 10-15 mph with gusts to 20 mph.

Two-Day Mountain Weather Forecast Produced in partnership with the NOAA-NWS
McCall Airport at 5021 feet.
  Monday Monday Night Tuesday
Weather: Isolated snow showers before noon. Partly sunny, with a high near 37. Calm wind becoming southwest 5 to 7 mph in the afternoon. Chance of precipitation is 20%. A 20 percent chance of snow after midnight. Increasing clouds, with a low around 22. South wind 3 to 6 mph. A chance of snow before noon, then a slight chance of rain and snow showers. Mostly cloudy, with a high near 42. South wind 7 to 9 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.
Temperatures: High 37 deg. F. Low 22 deg. F. High 42 deg. F.
Wind direction: calm becoming southwest south south
Wind speed: 5-7 3-6 7-9
Expected snowfall: 0 in. 0 in. Less than half an inch in.
Granite Mountain at 7700 feet.
  Monday Monday Night Tuesday
Weather: Isolated snow showers before 11am. Partly sunny, with a high near 31. West southwest wind 10 to 13 mph. Chance of precipitation is 20%. A 20 percent chance of snow after 11pm. Increasing clouds, with a low around 23. Breezy, with a west southwest wind 10 to 15 mph increasing to 17 to 22 mph after midnight. Winds could gust as high as 31 mph. A chance of snow before 11am, then a slight chance of snow showers after 11am. Mostly cloudy, with a high near 42. Windy, with a southwest wind 22 to 31 mph, with gusts as high as 44 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.
Temperatures: High 31 deg. F. Low 23 deg. F. High 42 deg. F.
Wind direction: west-southwest west-southwest southwest
Wind speed: 10-13 17-22 gusts to 31 22-31 gusts to 44
Expected snowfall: 0 in. 0 in. less than half an inch 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.