The total number of flash flood deaths has exceeded tornado fatalities during the last several decades. When concrete replaces soil, rain water will run off rather than soak in. Another danger associated with thunderstorms, especially to personal property, is hail. This hailfall occurred in Altus, Oklahoma in 1982 and was accompanied by several tornadoes .
Hail causes more monetary loss than any other type of thunderstorm-spawned severe weather.
Annually, the United States alone suffers about one billion dollars in crop damage from hail. Credits and Acknowledgments for WW2010.