Although the Emergency Alert System is decades old and often tested and used at the local level, you know it as the high-pitched noise that comes on during your television or radio show, it has never before been tested on a nationwide scale. The first-ever nationwide test will occur at 2:00pm Eastern (11:00am Seattle time) on Wednesday, November 9. The test will occur simultaneously across the US and its territories and will last approximately 30 seconds, after which regular programming will resume. The test will look and sound very similar to the local tests of the Emergency Alert System that occur frequently.
The test will appear on all broadcast radio and television stations, cable television systems, satellite radio and television systems, and wireline video service systems. The test will not impact landline or mobile phones, power grids, or Internet connectivity.
For more information, you can check out the FEMA website at: http://www.fema.gov/eastest.