The Cook nuclear power plant will be running extended tests of Berrien County’s emergency sirens this weekend. The sirens are sounded for one minute the first Saturday of each month at 1 p.m. and this Saturday’s test will be for three minutes. There are 70 omni-directional sirens as part of Berrien County’s Alert and Notification System within the 10 mile Emergency Planning Zone radius of the Cook plant in Bridgman. The Cook plant tells everyone not to be alarmed when they hear the sirens at 1 p.m. on Saturday. If it were a real emergency, the sirens would go off for three to five minutes.