Definition

Tornado Warning

Product issued by the National Weather Service when a tornado is occurring, is imminent, or has a high probability of occurring. A tornado is a violently rotating column of air, usually a pendent to a cumulonimbus, with circulation reaching the ground. It nearly always starts as a funnel cloud and may be accompanied by a loud roaring noise. On a local scale, it is the most destructive of all atmospheric phenomena. The tornado warning contains...

• County or counties affected by the severe weather event.
• Warning expiration time.
• Location and direction of storm movement.
• Locations in the path of the storm.
• Additional information and/or call-to-action statement(s).

Example

WFUS54 KFWD 290012
TORFTW
TXC439-290045-

BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING
NATIONAL WEATHER SERVICE FORT WORTH TX
610 PM CST TUE MAR 28 2000

THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A

* TORNADO WARNING FOR...
  TARRANT COUNTY IN NORTH CENTRAL TEXAS

* UNTIL 645 PM CST

* AT 610 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  A SEVERE THUNDERSTORM WITH A TORNADO CIRCULATION 5 MILES WEST 
  OF MEACHAM FIELD MOVING EAST AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE NORTH FORT WORTH...ESPECIALLY 
  ALONG NORTH LOOP 820 AREA FROM MEACHAM FIELD TO THE MID CITIES.

LAT...LON 3284 9750 3278 9750 3278 9724 3287 9723