- I'd wager that most people don't know what reigns as the worst form of natural disaster on Earth. I can tell you - it's flash-flooding. It often comes as a shocker to many people...but it is true. "On average, U.S. flooding kills more than 100 people a year — more than any other single weather hazard, including tornadoes and hurricanes, according to the University Corporation for Atmospheric Research. Most flood deaths are from flash floods, however, and about half of those are because people try to cross swollen streams or flooded roads. Victims often underestimate the power of water when driving into flooded areas, UCAR scientists note, adding that it takes only 18 inches of water to float a typical vehicle." That said - how awesome is THIS: (Amazing! One of the many great ways science provides balance...)