Understanding Dallas’ Outdoor Warning System
Feb. 5, 2025
Updated Sep. 3, 2025 at 1:47 p.m. CDT
Update:
12:04 p.m. Feb. 5, 2025: This story was updated with information on Wednesday’s test being canceled.
Introduction to the Outdoor Warning System
While you expect to hear Dallas’ outdoor warning system during a severe weather event, the sirens don’t always signal danger at other times.
The city’s Office of Emergency Management tests the sirens on the first Wednesday of the month at noon. The city does not conduct a test if the weather is bad, which included a cancellation of the test on Wednesday. While the department often puts out information about the test on social media, that doesn’t stop concerned citizens from calling the department to see what the emergency is.
How the Sirens Work
Dallas has 178 sirens around the city, and they can be triggered remotely by the emergency management department, meaning they can be set off in the middle of the night if need be. The sirens are designed so that they cannot be heard indoors, and the message they send is simple: If you are outside and can hear the sirens, it’s time to head inside and seek shelter immediately.
While sheltering inside during a severe weather event, it is essential to hunker down in an interior room of a home or office, such as a closet or bathroom. Avoid sheltering near a window or exterior wall.
Staying Informed
D-FW Weather Wise
How the Siren System Works
The emergency siren system is designed to put nearly all areas within Dallas city limits within earshot of a siren. When the alarms are going off, they can be heard steadily for about three to five minutes.
The Office of Emergency Management recommends checking for essential emergency information on a battery-powered device, such as a cell phone, if the sirens are going off during a severe weather event.
Criteria for Siren Activation
Contrary to popular belief, the sirens are not tornado or high wind alarms; rather, the sirens are used for any manner of severe weather. The criteria for siren activation, according to the Office of Emergency Management, are:
- The National Weather Service issues a tornado warning for the Dallas area.
- The weather service issues a severe thunderstorm warning with wind speeds exceeding 70 miles per hour in the Dallas area
- Storm spotters have reported a tornado in Dallas or a neighboring city.
- Hail of 1.5 inches or greater in diameter is reported.
- Other emergency situations, which are decided by the Office of Emergency Management on a case-by-case basis.
Conclusion
Understanding how the outdoor warning system works in Dallas is crucial for residents to stay safe during severe weather events. By knowing when and why the sirens are activated, citizens can take necessary precautions to protect themselves and their loved ones.
Frequently Asked Questions
Here are some frequently asked questions about the outdoor warning system in Dallas:
Q: How often are the sirens tested?
A: The sirens are tested on the first Wednesday of every month at noon, unless the weather is bad.
Q: Can the sirens be heard indoors?
A: No, the sirens are designed to be heard outdoors only.
Q: What should I do when I hear the sirens?
A: When you hear the sirens, seek shelter immediately in an interior room or area, such as a closet or bathroom, and stay away from windows and exterior walls.
Q: How long do the sirens sound?
A: The sirens sound steadily for about three to five minutes.
Q: Can I get emergency information on my cell phone?
A: Yes, the Office of Emergency Management recommends checking for essential emergency information on a battery-powered device, such as a cell phone, if the sirens are going off during a severe weather event.
