There are 120 “0UTDOOR WARNING SIRENS” located throughout the Louisville Metro Jefferson County area. The current siren system provides approximately 94% coverage to the total Louisville Metro population and 66% of the total acreage. The siren(s) will be activated  when a tornado warning or a chemical emergency occurs.  They can also be activated for other emergencies.
 

• Why are they called outdoor warning sirens?
  The sirens are called outdoor warning sirens because their primary purpose is to alert people who are outside to severe weather, chemical, or other emergencies. The system is not designed to provide notification inside of your home or business. 
• What should I do if I hear an outdoor warning siren?
  If you hear an outdoor warning siren you should seek shelter inside immediately. Once inside, you should turn on a television or radio to learn further information. Local officials will be disseminating information about the emergency through these outlets
  
• When should I expect to hear an outdoor warning siren?
  The outdoor warning sirens are tested on the second Tuesday of each month at 12:00 noon to ensure they are working properly. The sirens produce a loud wail sound.

Siren System Map