Moore itself has seen nine tornadoes between 1998 and 2015, three of them big enough to claim lives and cause catastrophic damage. The city of Moore was damaged by significant tornadoes on October 4, 1998; May 3, 1999; May 8, 2003; May 10, 2010; and May 20, 2013, with weaker tornadoes striking at other times, notably May 31, 2013 and March 25, 2015. Moore is located in Tornado Alley, a colloquial term for the area of the United States where tornadoes are most frequent. About 20 tornadoes occurred in the immediate vicinity of Moore from 1890 to 2013. The most significant tornadoes to hit Moore occurred in 1893, 1999, and 2013.