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Emergency Warnings

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Emergency notificationThe City of Lewisville employs a comprehensive emergency warning program, and has access to multiple tools that are used to notify the public of emergencies or disasters. No single tool will provide enough warning to all residents in all situations. It is important to have multiple ways of receiving emergency warnings.

This flyer highlights the importance of having multiple ways to receive weather warnings, by detailing the pros and various warning tools.

Lewisville Citizen Alert Emergency Notification System
Lewisville Citizen Alert is an emergency notification system used to make rapid emergency notifications to residents and businesses in the city of Lewisville. The system is used by Lewisville emergency officials to deliver severe weather notifications and incident-specific information or potentially life-saving instruction to those in the affected area(s). This system enables the City to deliver important messages to our residents and businesses via phone call, text message, or email.

To learn more about the Lewisville Citizen Alert emergency notification system, click here.

To sign-up to receive emergency notifications from the Lewisville Citizen Alert system via mobile phone, text or email, click here.

Outdoor Warning Siren System
The Outdoor Warning System in the City of Lewisville consists of 16 sirens strategically placed [PDF] throughout the city. The sirens are sounded when there is a dangerous situation outside. We stress that the Outdoor Warning System is primarily intended to warn people who are outdoors, so that they may seek shelter and seek information. We typically use the Outdoor Warning System sirens to warn our public of tornadoes in or approaching our area, but we may also use the sirens for other severe weather phenomena or other emergencies such as hazardous materials spills.

For additional information about the Outdoor Warning Sirens, click here.

For indoor emergency notifications, you should have a NOAA All-Hazard Radio and sign-up for the city's city's Emergency Notification System.

Click here to watch a video to hear what the Outdoor Warning System siren alert tone sounds like.


Lightning Detector System
Thor Guard Lightning Detectors can predict lightning before it strikes. Thor Guard Lightning Detectors continuously monitor the atmosphere's electrostatic energy and evaluates the potential for lightning (97% accurate within a 2-mile radius, with detection possible up to a 15-mile radius), and when a detector determines the potential for lightning in the area a 15-second air horn blast will sound and its strobe light will turn on. Upon hearing or seeing these signals people who are outdoors should seek appropriate shelter. When the detector senses conditions are safe, the strobe light will turn off and the horn will sound three short 4-second blasts. Then normal activity may resume. 

Thor Guard Lightning Detectors are installed at City parks and aquatic facilities, Lewisville Independent School District campuses, and at City Hall. A map of the Thor Guard Lightning Detector locations is available using our online GIS mapping system.

Click here To watch a video to hear what the Thor Guard Lightning Detector siren alert tone sounds like visit our YouTube Channel.


All-Hazards Weather Radio
The National Oceanic and Atmospheric Administration (NOAA) All-Hazards Radios are used nationwide, and broadcast weather information directly from the National Weather Service from a nationwide network of radio stations. During dangerous weather, they are activated automatically by the National Weather Service when the weather threatens a certain area. The Lewisville Office of Emergency Management highly recommends that you purchase an All-Hazards Weather Radio with the programmable alert feature (using S.A.M.E. technology), and program it accordingly to deliver weather warnings when issued for our area. These are excellent tools for ensuring your household has a means of receiving weather emergency warnings, especially during night time.


Our local area county codes are: 
  • Denton County: 048121
  • Dallas County: 048113
  • Tarrant County: 048439
  • Collin County: 048085


Wireless Emergency Alerts (WEAs)
The Wireless Emergency Alert (WEA) system is a public safety warning system that allows customers who own certain wireless phones and other enabled mobile devices to receive geographically-targeted, text-like messages alerting them of imminent threats to safety in their area. The technology ensures that emergency alerts will not get stuck in highly congested areas, which can happen with standard mobile voice and texting services. WEA (formerly known as the Commercial Mobile Alert System (CMAS) or Personal Localized Alerting Network (PLAN)) was established pursuant to the Federal Warning, Alert and Response Network (WARN) Act passed in 2006.

The three types of alerts through this system are:

  • Alerts issued by the President of the United States.
  • AMBER Alerts
  • Alerts involving imminent threats to safety of life. In our area the National Weather Service issues Tornado Warnings and Flash Flood Warnings via WEA.

For more information on WEAs, click here.

Smart Phone Applications
There are many different phone applications that offer push notification services during severe weather. Some are free and
some cost money. Depending on your particular preference, these apps can be downloaded to your smart phone as a tool for weather warning information. Be sure to enable the push notification, and set it to an audible tone that would wake you up at night.

Here are a few examples of phone apps that offer push notification alerts for dangerous weather:

Local TV
One of the best ways to stay apprised of unfolding major emergency incidents, such as dangerous weather, is local TV. Depending on the situation regularly scheduled programming may be interrupted and local news officials can provide real-time coverage and reporting of very specific and actionable information. Check with your TV service provider for information on local channels.

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