Floods kill more people on average than tornadoes and lightning combined! Most flood deaths are due to flash floods. Flash floods are often the result of heavy rains associated with severe thunderstorms.
You will not always have a warning that these deadly, sudden floods are coming. When a Flash Flood Watch is issued, be alert and be ready to evacuate on a moment’s notice. When a Flash Flood Warning is issued, or the moment you realize a flash flood is imminent, act quickly to save yourself. You may only have seconds.
Nearly half of all flash flood fatalities are auto related. In your automobile, look out for flooding at highway dips, bridges and low areas. Do not drive through flowing water. A mere two feet of water will carry away most automobiles.