This slope near West Yellowstone (here) was loaded by north winds and was likely triggered by snowmobilers. Areas where the snowpack is thin, specifically near ridgelines or rock bands will be likely areas to trigger a slide. Photo GNFAC Advisory Year 12-13 Forecast link: GNFAC Avalanche Advisory for Fri Feb 22, 2013Southern Madison, 2013-02-21Access other image sizes:Very Large 1200pxLarge 480pxMedium 220pxSmall 150pxOriginal