United States (USA) - Montana south of approximately 46°40'N - counties of Beaverhead; Big Horn; Broadwater; Carbon; Carter; Custer; Deer Lodge; Fallon; Gallatin; Golden Valley; Granite; Jefferson; Madison; Musselshell; Park; Powder River; Ravalli; Rosebud; Silver Bow; Stillwater; Sweet Grass; Treasure; Wheatland; Yellowstone.