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A tornado emergency is a stronger wording of tornado warnings used by the National Weather Service in the United States. It is used when a large, powerful tornado is in an area with a lot of people. It means that a very large amount of damage and a high possibility of a lot of deaths are expected.
The term was first used on May 3, 1999 when an F5 tornado hit just south of Oklahoma City in Moore. Between 5:30 and 6:00 PM, a large, powerful tornado was heading for Oklahoma City, leading to the first tornado emergency.
- "May 3rd, 1999 from the NWS's Perspective". The Southern Plains Cyclone (National Weather Service) 2 (2). Spring 2004. Archived from the original on 2004-11-08. http://replay.waybackmachine.org/20041108065124/http://www.srh.noaa.gov/oun/newsletter/spring2004/#19990503. Retrieved 2008-02-15.
- Mathis, Nancy (2007). "Inside the Bear's Cage". Storm Warning: The Story of a Killer Tornado. Touchstone. p. 129. .