According to the NWS online, this is used in the event that "long-lived intense tornadoes are likely."
Here is more information about a "PDS watch" from the National Weather Service's Storm Prediction Center website FAQ:
The "Particularly Dangerous Situation" wording is used in Tornado Watches for rare situations when long-lived intense tornadoes are likely. This enhanced wording may also accompany Severe Thunderstorm Watches for widespread significant severe events, usually produced by exceptionally intense derechos. PDS watches are issued, when in the opinion of the forecaster, the likelihood of significant events is boosted by very volatile atmospheric conditions. Usually this decision is based on a number of atmospheric clues and parameters, so the decision to issue a PDS watch is subjective with no hard criteria. However, the SPC goal is to have 3 out of every 4 PDS Tornado Watches verifying with multiple intense tornadoes. PDS watches are most often issued with a High risk in Day 1 Convective Outlooks.
- Oklahoma man finds 7-foot snake in dryer vent
- Sign up for free FOX23 Newsletters
- ‘Game of Throne' finale: Fans react with love, hate to epic series ending
- FOLLOW FOX23 on Facebook for updates in your news feed
- Hero coach tackles armed student preventing potential school attack
- DOWNLOAD the FOX23 News app for updates sent to your phone
© 2019 Cox Media Group.