Outdoor Warning System

outdoor warning system
Severe Weather Siren

What To Do If Sirens Are Activated

If you hear the sirens while you are outside, please go inside and seek shelter immediately and refer to a television or radio for further instructions. Please do not call 911 for severe weather information, as it is only to report life-threatening situations. .


The siren will produce a steady tone signal for three minutes. The sound will have a natural decrease / increase due to the rotation of the siren head. The sirens will only be initiated in the case of severe weather directly threatening Double Oak & Flower Mound as reported by the National Weather Service, a storm spotter, or certain Town employees that meets at least one of the following criteria:

  • Reported hail of 1.50” in diameter or greater (or smaller for areas or events where large numbers of people are outdoors)
  • Rotation in a dangerous cloud or a tornado
  • Straight-line winds over 70 mph

Monthly Testing

The Outdoor Warning Sirens are silently tested every day to ensure that the system is functioning correctly. Audible tests of the system are performed on the first Wednesday of every month at 1:00 p.m., weather permitting.