On Saturday, August 23, the County Office of Emergency Services will be conducting the Annual Early Warning System siren test in addition to a Reverse 911 test. The Reverse 9-1-1 system will be activated for all landline and registered cell phones located within the Emergency Planning Zone. The test will be conducted between 9am and noon and will help emergency officials verify the capabilities of the Reverse 911 system. Following the Reverse 911 test, the Early Warning System sirens will be activated for two full-scale tests. The first test will be conducted at noon, with a second test following at 1230 pm. During both tests, all 131 sirens will be activated simultaneously. Two tests of the system are necessary to allow emergency officials to activate the system from two separate activation points. During each test, the sirens will sound for approximately 3 minutes. No action is required on the part of the public during any of these tests.