The rainline rose yesterday to nearly 8000 feet. This may be the first time that layers in the snowpack get saturation from the rain, and there are plenty of crusts that may pool up water, and create a good lubrication for avalanches. Areas on northerly exposures that have large overhanging cornices will likely be tender...give these giants some room, and stay far back from the often hard to determine edge.
Other aspects that had older weak layers including crusts or grauple layers in the upper snowpack will likely be saturated enough to fail naturally or will already have failed last night.
It may take a while for buried wet snow to re-freeze...Careful snowpack evaluation, cautious routefinding, and conservative decisionmaking are essential!
Winds out of the South/ Southwest drove the last round of snow, sometimes reaching speeds of 41 mph. Expect to see some new, shallow wind slabs near ridge tops leading into NW, N. NE, and East aspects. The wind slabs should stabilize quickly as temperatures in the last 24 hours have trended downward, and are forecasted to do so over the next 24 hours. Cracking, hollow or drummy sounds, sculpting of the snow surface, thick pillows, and thin spots are all clues that should help you recognize wind slab problems.
Light snow will fall in the upper elevations today bringing in olny around an inch with a high around 35 degrees, and moderate Southwest winds switching from the Northwest this afternoon. McCall will see a mixture of rain and snow this afternoon with a high around 40 degrees, West wind 5-7 mph. No new snow is expected tonight, and we should see low temps in the teens up high, and 20's in the valley. Wednesday we will begin another warming trend.
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.