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An example of a tornado warning polygon issued by the National Weather Service. 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.
Map of regions covered by the 122 Weather Forecast Offices. The National Weather Service operates 122 weather forecast offices. [1] [2] Each weather forecast office (WFO or NWSFO) has a geographic area of responsibility, also known as a county warning area, for issuing local public, marine, aviation, fire, and hydrology forecasts.
Since its initial usage in May 1999, the National Weather Service (NWS) in the United States has used the tornado emergency bulletin — a 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 ground ...
Parts of the Chicago area could see severe thunderstorms Tuesday evening, with hail, strong winds and tornadoes possible, according to the National Weather Service. Northwestern Illinois and the ...
The tornado first touched down at 11:02 p.m. in the Springbrook Prairie Forest Preserve, [5] with the first tornado warning including Naperville and Woodridge issued at 11:05 p.m. for radar-indicated rotation. This warning included areas of Chicago as well, specifically the Chicago Lawn and Midway International Airport areas. [8]
Warning sirens could be heard ringing out in downtown Chicago as multiple tornadoes touched down close to the city on Wednesday 12 July. The eerie sound could be heard in footage posted by Twitter ...
The city’s Office of Emergency Management and Communications issued a severe storm warning at about 7:15 p.m., which was expected to last until 9 p.m., while the National Weather Service ...
PDS tornado warnings are currently issued on an experimental basis by the 38 National Weather Service Weather Forecast Offices within the Central Region. [19] The criteria for a PDS warning are when a tornado on the ground has been spotted or confirmed, or a significant tornado is expected based on radar signatures.