The county conducts an audible test of the warning system once or twice per year, according to Arlington Office of Emergency Management (OEM) Director Jack Brown. Residents in some of Arlington’s more urban areas would have heard a beep or series of beeps during the test, he said.
Arlington’s outdoor warning system was first installed in 2007, using $400,000 in funding from the Department of Homeland Security. The system includes six warning speakers: two in Rosslyn, one in Clarendon, one in Courthouse, and two in Pentagon City. The speakers are controlled by a line-of-sight radio signal.