Outdoor Sirens

Allen operates 26 outdoor warning sirens that sound during severe weather events, including large hail, heavy winds and tornado warnings. Though the sirens are placed strategically throughout the city, they are designed to warn people who are outdoors. People who are inside may not hear them, as air conditioning, thunder, wind, rain and other conditions can drown out the sound.

Sirens are activated for:
  • Hail greater than 1 inch in size
  • Winds greater than 70 mph
  • Tornado warnings from the National Weather Service naming Allen in the path
If you hear sirens, you should get indoors, find shelter and seek information by following these storm and tornado safety tips.

About Allen's Outdoor Warning Sirens

Siren testing
The City of Allen tests outdoor warning sirens at noon on the first Wednesday of every month. Tests will not be performed during severe weather events. If Allen is experiencing severe weather on a regularly-scheduled date for siren testing, please assume the siren is weather-related, seek shelter immediately, and check the City’s website for additional information.

  1. Where to Go
  2. Siren Policy
  3. Warning Signals
If you hear a siren, you should take shelter immediately. Remember that thunderstorms can produce a tornado with little or no warning. Read more about where to go in a severe thunderstorm.

Click to view interactive map of sirens

map of outdoor warning sirens