tornado watch, National Weather Service
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A tornado warning will tell you specifically what prompted it to be issued. Many are issued based on radar showing rotation, indicating a tornado is possible. Others can be confirmed as in progress by debris detected on radar or visually by a spotter.
A tornado watch has been issued for the entire region until midnight. This is a particularly dangerous situation (PDS).
A once-in-a generation extreme weather event is beginning Wednesday with a tornado outbreak and will continue into the weekend with dangerous, life-threatening flooding.
Much of U.S. on high alert as 'dangerous' system tracks east, spinning up tornadoes, flood risk
A powerful, wide-reaching spring storm is threatening parts of the central and eastern US, with a life-threatening outbreak of long-lived and strong tornadoes possible in some areas. Follow here for live updates.
The National Weather Service is responsible for issuing watches, warnings and advisories to alert the public when dangerous weather conditions are expected.