It was the predominant Top 40 format music station in the area during the 1960s and into the 1970s. It was known during this era as "The Mighty 590". WARM has held its original call sign since it signed on the AM broadcast band in 1940.
During the 1960s and 1970s, WARM was the most popular Top 40 radio station in the area, known as "The Mighty 590".  Since its launch in 1940, WARM has kept its original call sign.