A backcountry avalanche warning has been issued for the Gallatin National Forest Avalanche Center’s entire advisory area.

Natural avalanche activity is likely on all slopes following heavy snowfall and strong winds that created widespread instability, according to the GNFAC.

The avalanche danger is rated high in the Bridger, Gallatin and Madison ranges along with the Lionhead area outside West Yellowstone and mountains around Cooke City.

“Very dangerous avalanche conditions exist. Travel in avalanche terrain is not recommended and avalanche runout zones should be avoided,” according to the GNFAC website.

The warning continued until 6:30 a.m. Friday, Nov. 28.

According to the GNFAC, the northern mountains received about are 14 inches of snow. About a foot of snow accumulated in the area from Big Sky to West Yellowstone and 1 ½ to 2 feet in Cooke City.