United States (USA) - Oklahoma south of approximately 35°20'N - counties of Atoka; Beckham; Bryan; Caddo; Carter; Choctaw; Cleveland; Coal; Comanche; Cotton; Garvin; Grady; Greer; Harmon; Haskell; Hughes; Jackson; Jefferson; Johnston; Kiowa; Latimer; Le Flore; Love; Marshall; McClain; McCurtain; McIntosh; Murray; Pittsburg; Pontotoc; Pottawatomie; Pushmataha; Seminole; Stephens; Tillman; Washita.