THE GALLATIN NATIONAL FOREST AVALANCHE CENTER IS ISSUING A BACKCOUNTRY AVALANCHE WARNING FOR THE ENTIRE ADVISORY AREA INCLUDING THE BRIDGER... GALLATIN AND MADISON RANGES.THE LIONHEAD AREA NEAR WEST YELLOWSTONE... THE MOUNTAINS AROUND COOKE CITY. HEAVY SNOWFALL... HIGH WINDS... AND AN EXTREMELY WEAK SNOWPACK ARE CAUSING UNSTABLE CONDITIONS. AVALANCHES WERE OCCURRING PRIOR TO LAST NIGHTS STORM. MORE ARE EXPECTED. TODAY THE AVALANCHE DANGER IS HIGH ON ALL SLOPES. AREAS OF UNSTABLE SNOW EXIST. NATURAL AND HUMAN TRIGGERED AVALANCHES ARE LIKELY. AVALANCHE TERRAIN INCLUDING AVALANCHE RUNOUT ZONES SHOULD BE AVOIDED. YOU ARE URGED TO CALL THE GALLATIN NATIONAL FOREST AVALANCHE ADVISORY FOR MORE DETAILED INFORMATION... BOZEMAN... LIVINGSTON... COOKE CITY... AND WEST YELLOWSTONE...