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A tornado warning (SAME code: TOR) is a public warning that is issued by weather forecasting agencies to an area in the direct path of a tornado, or a severe thunderstorm capable of producing one, and advises individuals in that area to take cover. Modern weather surveillance technology such as Doppler weather radar can detect rotation in a ...
The tornado first touched down at 11:02 p.m. in the Springbrook Prairie Forest Preserve, and the first warning for the tornado was issued at 11:05 p.m. for radar-indicated rotation. This warning included Naperville and Woodridge, as well as areas of Chicago such as the Chicago Lawn and Midway International Airport areas.
Since its initial usage in May 1999, the National Weather Service (NWS) in the United States has used the tornado emergency bulletin, an unofficial, high-end classification of tornado warning—sent through either the issuance of a warning or via a "severe weather statement" that provides updated information on an ongoing warning—that is issued when a violent tornado (confirmed by radar or ...
A warning means a tornado has been sighted or weather radar indicates rotation and a possible tornado. It represents imminent danger to life and property and urges immediate action to get to a ...
A warning signals that a tornado has been indicated or spotted on a weather radar and covers a smaller area, like a city or a county. Under a warning, people should seek shelter and take action ...
A tornado warning is issued when a tornado has been sighted or indicated by weather radar. When a tornado warning is issued, the NWS recommends taking immediate action and moving to the lowest ...
A severe thunderstorm warning (SAME code: SVR) is a type of public warning for severe weather that is issued by weather forecasting agencies worldwide when one or more severe thunderstorms have been detected by Doppler weather radar, observed by weather spotters, or reported by an emergency management agency, law enforcement, or the general ...
The most "extreme" tornado in recorded history was the Tri-State tornado, which spread through parts of Missouri, Illinois, and Indiana on March 18, 1925. It is considered an F5 on the Fujita Scale, holds records for longest path length at 219 miles (352 km) and longest duration at about 3⁄ hours, and held the fastest forward speed for a ...