And unlike how sirens are sounded in some counties, only the sirens within the warning polygon will go off ... that have been warned by the National Weather Service,” he said.

The National Weather Service in Fort Worth and Shreveport issued dozens of alerts on Friday as severe storms ripped through ...

The advanced technology of these sirens allows them to be sounded based on the national weather service’s warning polygon. Only sirens within the polygon will go off, not all of the others.