PDS Severe Thunderstorm Watch
PDS stands for "Particularly Dangerous Situation" and is issued by the SPC when conditions are favorable for the development of high-end severe thunderstorms over a larger region. In this situation the SPC believes multiple events of extreme severe weather with significant wind damage are likely to occur. Citizens should alter their daily routine and listen for further updates when this watch is issued. Tornadoes are not expected in such situations, but isolated tornado development cannot be ruled out and widespread straight-line wind damage is likely.
Tornado Warning - Considerable
Issued when a reliable spotter reports the existence of a tornado (therefore, it is confirmed, not radar indicated) and it is doing considerable damage.
Tornado Warning - Catastrophic
Issued when a reliable spotter reports the existence of a tornado (therefore, it is confirmed, not radar indicated) and it is doing extreme damage that is considered catastrophic; complete destruction is possible.
PDS Tornado Watch
PDS stands for "Particularly Dangerous Situation" and is issued when the SPC believes that a large outbreak of long-lived, large and violent tornadoes is likely. This is a high-end tornado watch. People in a PDS Tornado Watch should change their daily routines to ensure they are weather aware and prepared to take action with little notice.
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