Flash flooding and flooding accounted for 135 deaths over the 30 year period, while lightning was second with 85 deaths. Tornadoes were actually third with 73 deaths and hurricanes accounted for 25 deaths from 1966 to 1995. Many flash flooding deaths occur as people try to drive across a flooded roadway. It only takes a little more than a foot of water to pick up your car and sweep it downstream. Never drive across flooded roadways.