The county will test its early warning system sirens Tuesday and Wednesday (July 24 and 25), the Office of Emergency Services has announced.

Called a “growl test,” the effort allows those in charge of emergencies to check individually each of the 131 sirens throughout the Diablo Canyon Emergency Planning Zone. Each test will last a few seconds.

Early warnings sirens were installed as a condition of allowing the Diablo Canyon nuclear power plant. They cover from Cayucos to the Nipomo Mesa, and can be activated for any major emergency.

For more information on emergency preparedness go to http://www.slocounty.ca.gov/oes.