United States (USA) - North Dakota north of approximately 47°25'N - counties of Benson; Bottineau; Burke; Cavalier; Divide; Eddy; Foster; Grand Forks; Griggs; McHenry; McKenzie; McLean; Mountrial; Nelson; Pembina; Pierce; Ramsey; Renville; Rolette; Sheridan; Steele; Towner; Traill; Walsh; Ward; Wells; Williams.