United States (USA) - North Dakota south of approximately 47°25'N - counties of Adams; Barnes; Billings; Bowman; Burleigh; Cass; Dickey; Dunn; Emmons; Golden Valley; Grant; Hettinger; Kidder; La Moure; Logan; McIntosh; Mercer; Morton; Oliver; Ransom; Richland; Sargent; Sioux; Slope; Stark; Stutsman.