The monthly test of the 蘑菇视频 Outdoor warning sirens is scheduled for Saturday April 2, 2011, immediately following the test of the Metro sirens at noon.
The Metro sirens are tested on the first Saturday of each month.聽The 蘑菇视频 Sirens are tested聽immediately following the test of the聽Davidson County Sirens聽to allow individuals to be able to hear and distinguish the Metro sirens from the VU sirens by both location and distinctive alert tone.
During tests, the sirens typically sound for only聽15-30 seconds; during an actual alert, the sirens sound for 3 minutes.
The test聽of the 蘑菇视频聽siren system聽is preceded by聽an announcement stating 鈥淭his is a test of the 蘑菇视频 Severe Weather Sirens. This is ONLY a test.鈥� Because voice announcements do not carry as far as the siren wail, the announcements may not be audible in all locations prior to the test.
to a sound sample of 蘑菇视频聽‘s outdoor warning sirens.