The rainline rose yesterday afternoon and through the night last night to nearly 8000 feet. Some of the areas that are getting rain right now have probably not had rain yet this year. Areas on northerly exposures that had large overhanging cornices will likely be experiencing widespread cornice failures today. 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. Travel in or under steep slopes is not recommended today, the possibility of large wet avalanches traveling long distances will also be a concern in steep canyons that have large slopes above them such as the South Fork Salmon Drainage and its tributaries.
Expect to see widespread roller ball, point release and loose/wet slides today on all steep aspects. Road cuts, steep drainages and gully features are going to be places to avoid as these are terrain traps where loose/wet slide debris will be able to pile up deep. Pay attention to your surroundings and avoid traveling on or below steep slopes with wet, unconsolidated snow. This hazard will decline rapidly as an approaching cold front refreezes the upper snowpack over the next 24 hours.
Temperatures at local snotel site between 6200 and 6700 feet this morning are showing mid 30's with between .5 and .9 inches of Snow Water Equivalent over the last 24 hours...all of which came down as liquid. Snow levels yesterday topped 7500 feet and were expected to be near 8000 feet this morning. As of 6 am it was snowing at the top of Tamarack Resort( 7700 feet). The good news is a cold front will cool things down today.
It is currently in the mid 30's near 7000 feet this morning. Rain is expected to 8000 feet this morning with a cold front moving in to the West Central Mountains later in the day bringing the snowline back down to 4000-5000 feet. Model forecasts are calling for .5-.7 inches of precip in the next 24 hours. Snow totals in the upper elevations look to be getting close to 10 inches by Monday night once the cold front arrives. Winds today are going to be gusting into 40+ range with pre frontal winds out of the south at 26-31 decreasing later in the day to 17-22 mph. A significant cool down will take place later today and tonight with lows expected in the mountains and the valleys around 23. A progressive storm pattern will persist through much of the coming week bringing additional snow accumulations in the mountains.
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.