A thunderstorm is a storm that contains both thunder and lightning. These storms can produce flash flooding, gusty winds, hail, and even tornadoes. The southern part of the United States has the highest number of average annual thunderstorms, especially those states located near the Gulf of Mexico and the Atlantic Ocean.
West Virginia typically sees between 40 and 50 thunderstorms a year, depending on the location within the state. While most of the thunderstorm activity is observed during the summer months, the passage of cold fronts through the state during the spring and fall can also spawn severe thunderstorms.
Source: NOAA SPC
On July 7, 1980, strong thunderstorms dumped hail across the entire state during the late afternoon and evening hours. Penny-sized hail was reported in Clarksburg and Madison, while quarter-sized hail was observed near Beckley and Ripley. However, storm reports of softball-sized (4.50") hail were made in the town of Welch, located in McDowell County.