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A watch or warning bearing the phrase is referred to as a PDS watch or PDS warning. First used by the Storm Prediction Center (SPC), a national guidance center of the National Weather Service , for tornado watches , the phrase was later applied to other severe weather watches and warnings by the agency's regional forecast offices.
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.
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.
The PDS wording can be incorporated into the text of a tornado warning, either upon its initial issuance or in a "severe weather statement" providing updated information on the storm, when a considerable tornado debris signature is detected on radar or a large tornado is visually observed.
Past warnings. The weather service's Storm Prediction Center — whose mission is to provide "forecasts and watches for severe thunderstorms and tornadoes” — says that the term was first used on April 2, 1982 by forecaster Robert H. Johns, in conjunction with a tornado watch.
Dangerous weather is expected across Central Kentucky Tuesday afternoon.
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 ...
A tornado outbreak threatened parts of the South on Saturday, prompting forecasters to issue a rare "particularly dangerous situation" alert amid severe storms that have killed at least one person ...