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For the safety of the citizens, emergency sirens are tested the first Monday of every month at noon and sound of for less than one minute. In time of emergency, the Louisville Communication Center will sound the signal in a pattern of three minutes of siren, then one minute of silence, then three minutes of siren, then one minute of silence, then three minutes of siren. There is no all clear siren. If you sight a tornado or other severe weather conditions, call the Louisville Police/Fire Department at 911. They will be alert to track the direction of the storm.