If lightning can't strike twice in the same place, apparently tornadoes can. On Monday, May 20, 2013, Moore, Oklahoma experienced its second deadly tornado. The first slammed the region in May 1999. According to the National Weather Service, the 2013 tornado's wind speeds exceeded 200 mph and was at least half of a mile wide. (In 1999, wind speeds were clocked at 300 mph.)
Tornado season has those in living in North America's "Tornado Alley" heading for safe shelter and praying that the storm will pass without touching down.
"Tornado alley" is a term used to describe the area of the U.S. between the Rocky Mountains and the Appalachian Mountains. Texas, Oklahoma and Kansas are usually hardest hit, but killer tornadoes do occur in states outside of Tornado Alley.
It was once thought that twisters only touched down in rural areas. But the Salt Lake City, Utah tornado of 1999 disproved such a theory. It was also an unusual part of the country for a cyclone to touch down.
In 1953 another tornado hit outside of Tornado Alley in Flint, Michigan killing 116. One day later, from the same storm, a massive F4 tornado stayed on the ground for an hour and a half in Worcester, Massachusetts, injuring 1300 and killing 95.
This 1-mile wide tornado traveled 46 miles to Worcester, Massachusetts and Damage was phenomenal. Debris was thrown as far as 110 miles away and 10,000 people were left homeless. This tornado outside of tornado alley, proved again that tornadoes can and will occur anywhere.
The deadliest tornado, struck the U.S. on March 18, 1925, and killed 695 people in Missouri, Illinois and Indiana.
Click through the list for aftermath pictures of killer tornadoes.