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According to the National Weather Service in Norman, Okla., the tornado was on the ground for approximately 40 minutes, and a tornado warning was in effect for 16 minutes before twister developed.
Weather officials estimated the strength of the tornado to be an F4 or F5 on the Fujita scale, the highest rating a tornado can achieve.
On May 3, 1999, a tornado outbreak near Oklahoma City produced 14 tornadoes—including an F5 in Moore—killing 36 people and injuring 295 others. A host on KFOR called Monday's storm "the worst tornado damagewise in the history of the world."