There will be a test of the Indian Point sirens in Westchester, Putnam, Rockland and Orange Counties on Thursday at approximately 10:30 a.m, according to an announcement on westchestergov.com.
This sounding is only a test and no action by the public is necessary, the announcement said.
The sirens would sound continuously at full volume for four minutes, followed by the broadcast of an Emergency Alert System (EAS) message on radio and television stations during an actual emergency. Sirens are not a signal to evacuate, but rather for people to tune to an EAS radio or TV station for information and instructions.
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http://mtkisco.dailyvoice.com/news/indian-point-sirens-will-be-tested-thursday