Editor's note: This story was originally published on March 15, 2019.
When you hear emergency sirens going off like they did during Friday's storms, it's time to take shelter.
It's a warning sound that most people in the Tri-State had likely heard before. But where they are when they hear it could mean something slightly different, as different communities use the sirens with slightly different guidelines.
In Hamilton, Clermont, Butler and Warren counties, the siren is used only when the National Weather Service has issued a Tornado Warning.
In Brown County, a Tornado Watch combined with a Severe Weather Warning could also trigger the alert.
In Kentucky, it's more uniform. Sirens only go off if a tornado or funnel cloud has actually been spotted.
For more information on how things work in your neighborhood, check with your county's emergency management agency.