Large, powerful tornadoes can cause a very large amount of damage when striking areas with a lot of people.

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.[1][2]

Tornado safety

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If people are in a tornado's path, they should follow these safety tips:

Tornado emergency example

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SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
1203 PM CDT SAT APR 24 2010

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1230 PM CDT FOR CENTRAL
YAZOO COUNTY...

...THIS IS A TORNADO EMERGENCY FOR THE WARNED AREA...

AT 1203 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS AND STORM
SPOTTERS WERE TRACKING A LARGE AND EXTREMELY DANGEROUS WEDGE
TORNADO.  THIS TORNADO WAS LOCATED 6 MILES NORTH OF SATARTIA MOVING
NORTHEAST AT 60 MPH.

THE TORNADO WILL BE NEAR...
  YAZOO CITY AND LITTLE YAZOO BY 1210 PM CDT...
  MYRLEVILLE BY 1215 PM CDT...
  BENTON AND EDEN BY 1220 PM CDT...
  MIDWAY BY 1225 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT A TORNADO IS OCCURRING OR IMMINENT. YOU
SHOULD ACTIVATE YOUR TORNADO ACTION PLAN AND TAKE PROTECTIVE ACTION
NOW. SIGNIFICANT DAMAGE HAS OCCURRED WITH THIS SIGNIFICANT TORNADO!

THIS IS AN EXTREMELY DANGEROUS AND SERIOUS LIFE THREATENING
SITUATION. THIS STORM IS CAPABLE OF PRODUCING STRONG TO VIOLENT
TORNADOES. IF YOU ARE IN THE PATH OF THIS TORNADO...TAKE COVER
IMMEDIATELY!

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT SATURDAY EVENING
FOR MISSISSIPPI.

References

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  1. "May 3rd, 1999 from the NWS's Perspective". The Southern Plains Cyclone. 2 (2). National Weather Service. Spring 2004. Archived from the original on 2004-11-08. Retrieved 2008-02-15.
  2. Mathis, Nancy (2007). "Inside the Bear's Cage". Storm Warning: The Story of a Killer Tornado. Touchstone. p. 129. ISBN 978-0-7432-8053-2.