Outdoor Warning System

About Prosper's Outdoor Warning System

The Town of Prosper has an extensive Outdoor Warning System which comprises 10 warning sirens to alert residents in case of emergencies such as severe weather, civil defense, and hazardous materials accidents. To view the warning siren locations, click on the Outdoor Warning Sirens Map (PDF).

Criteria for Activating Sirens

Sirens will be activated under the following circumstances:

  • The National Weather Service has issued a Severe Thunderstorm Warning with destructive winds exceeding 70 miles per hour, or a Tornado Warning for areas in and around the Town of Prosper.
  • Trained storm spotters have reported a tornado in the Town of Prosper or in neighboring jurisdictions that may affect the Town of Prosper.
  • Hail measuring 1.5 inches in diameter or greater has been reported.
  • Other emergencies as directed by Prosper Emergency Management. 

What should I do when the Outdoor Warning System sounds? 

  • Take shelter in interior portions and on lower floors of buildings. Stay away from windows and rooms with long roof spans. 
  • If outside seek inside shelter. If shelter is not available, lie flat in a ditch, ravine, or depression. Do not get under an overpass or bridge. 
  • Listen to your local radio or local television station for information. 

Outdoor Warning System Test

The monthly outdoor warning system test takes place on the first Wednesday of each month at noon. The test will not be activated if there is a credible report of severe weather or overcast skies. 

Have an Emergency Plan

Citizens should have a storm emergency plan in place and practice the plan regularly. KnoWhat2Do website can help you develop an emergency plan. A portable battery-operated radio or programmable weather alert radio should be incorporated into the plan. 

Please do not call 9-1-1, the fire department, or the police department when you hear the Outdoor Warning System unless you have an emergency. Instead, take immediate shelter, and listen to a radio, local television, or weather radio station for further information. Calls to these numbers asking for weather details create the potential for true emergency calls being delayed. During severe weather, it is especially important for 9-1-1 lines to be available for emergency response.