KDKA-Channel 2 hired DeNardo in the late 1950s to brief its on-air weather personalities before every newscast. Eventually, Channel 2 managers asked him to do a few forecasts for the TV station's sibling radio station, KDKA-1020 AM. KDKA Radio started DeNardo broadcast career in 1957. DeNardo and KDKA reached an agreement where he would broadcast his weather reports on television. KDKA became one of the first stations in the country with a "real meteorologist" as a part of the programming and DeNardo began his regional fame and celebrity status. After a new manager took over, DeNardo left KDKA, citing the unpleasant atmosphere. DeNardo landed at WTAE-TV in 1969, bringing his news anchor partner Paul Long with him to WTAE, continuing their often sardonic banter when Long would introduce DeNardo for the weather segment of the news. Joe was so popular that his presence at WTAE was the focus of an advertising campaign.