 This in turn is said to make WEW the "oldest broadcast station west of the Mississippi River".This assertion uses April 26, 1921, the date that 9YK made its first audio weather report broadcast, as the starting date for combined 9YK/WEW operations.However, numerous other stations, on both sides of the Mississippi River, have earlier establishment dates than both KDKA and WEW when combined with their predecessor operations, including 8MK/WWJ in Detroit, Michigan, which began regular broadcasts in August 1920, WOC in Davenport, Iowa, which traces its origin to station 9BY, which began regular broadcasts around September 1920, 9ZAF/KLZ in Denver, Colorado, with regular programs beginning in October 1920, and 9XM/WHA in Madison, Wisconsin, which began transmitting weather forecasts in January 1921.