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If you are anywhere near or within earshot of a cellphone, a radio or TV on Wednesday morning, you will hear the jarring sound of an emergency alert.
The nationwide emergency alert test is expected to come at 11:20 a.m. in California, Vacaville Fire Department officials said in a social media post.
If your mobile phone is on and within range of an active cell tower from a participating wireless provider, you should receive the national test.
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Wireless providers will transmit the national test for 30 minutes, but your phone should only receive it once.
The message will read: “THIS IS A TEST of the National Wireless Emergency Alert System. No action is needed.”
Phones with the main menu set to Spanish will display: “ESTA ES UNA PRUEBA del Sistema Nacional de Alerta de Emergencia. No se necesita acción.”