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PDS tornado warnings are currently issued on an experimental basis by the 38 National Weather Service Weather Forecast Offices within the Central Region. [16] 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.
The warning is then disseminated to the public through terrestrial television and radio stations, online media, mobile app and SMS messaging through Emergency Mobile Alert (EMA); if a tornado has been sighted or indicated by radar within the warned area during the severe thunderstorm warning's duration, civil defense sirens, if present, are ...
PDS is a label used in situations when “there’s an expectation of particularly violent tornadoes possible,” said Andy Ervin with the National Weather Service's office in the Quad Cities.
The inclusion of PDS wording (more commonly used for tornado watches in areas where the environment supports the development of strong to violent tornadoes) is rare for severe thunderstorm watches since the tornado threat, in comparison to the much higher threat of extreme wind or hail, must remain low enough to where a standard (non-PDS ...
A severe weather warning is more serious than a watch. It signals dangerous weather is happening, is on its way or has a high chance of occurring. It signals dangerous weather is happening, is on ...
A tornado watch is typically less severe than a tornado warning and encompasses a larger area like multiple counties and states. It serves as a signal for people to prepare in case of an emergency.
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.
A severe thunderstorm watch has been issued over the Southwest Ohio region until 4 p.m., and a tornado warning has been issued in parts of Kentucky.