Outdoor Warning Sirens

Siren Locations


Q. Why use outdoor warning sirens?

A. Sirens are still the most effective method to warn the population at large in the shortest amount of time. People who may be outdoors at ball games, in their yard, or anywhere else where they are not in contact with the normal news media channels such as radio, TV or local public address systems, will get immediate notification of severe weather or any other emergency that requires taking shelter.


Q. How are they activated?

A. Radio control is the most popular method of activating sirens. To activate the siren system, the operator presses a button and a radio signal is transmitted. The signals are picked up by the receivers at the sirens. They decode the paging signals to determine what they are to do. A particular signal may instruct the sirens to give a weather warning call, while still another may cause the sirens to stop their sounding. With the new generation of communication signal processors, the variations are limitless.

Q. Why are they called outdoor warning sirens?

A. The sirens are called outdoor warning sirens because their primary purpose is to alert people who are outside to severe weather, chemical, or other emergencies. While you may be able to hear the siren in your house, this is not the primary function of the outdoor warning siren.


Q. Why can't I hear the siren in my basement?

A. Each siren is rated at 127 dB (decibels). The sirens are located in a grid system with approximately 1 mile separation.127 dB is slightly "louder" than a jet engine on take off. Comparing the sirens to the plane; the farther away the plane gets, the weaker the noise. In addition to distance, other factors effect how sound travels. Wind, terrain, other background noise (TV, stereo) and building walls reduce sound travel. The combination of building walls (insulation) and other interior background noise reduces the exterior noise you can hear inside your house. 140 dB can damage hearing, so there is a practical limit to how loud the outdoor warning sirens can be and still be effective. The 1 mile separation distance with the overlapping grid is considered to be one of the most effective methods to alert persons who are out of doors to seek shelter and tune in a local broadcast station to receive emergency information and instructions.


Q. Why aren't there more sirens?

Purchasing and placing of the sirens is dependent on several things, the primary one being the availability of funds to purchase and install them. The sirens have been purchased with special purpose tax funds that have been approved by the voters, and determining the locations and needs for new sirens is dependent on growth and development.


Q. When are the outdoor warning sirens tested?

A. The outdoor warning sirens are tested at noon on the first Friday of each month. In the event of threatening weather, the test may be postponed.


Q. What should I do if I hear an outdoor warning siren?

A. If you hear an outdoor warning siren you should seek shelter immediately. Once inside, you should turn on a local television station or radio station (KFBC AM 1240) to find out further information. Local officials will be disseminating information about the emergency through these outlets. An all hazards weather alert radio is a good tool to have in your home during any emergency situation.


Q. Why aren't the sirens sounding throughout the whole county anymore when there is an emergency?

A. The sirens will only be activated in the area of the County that the emergency is affecting. Laramie County is such a large County that it would be unnecessary to alert residents in the one part of the County about an emergency that will have no affect on their area.


If you have a question regarding the outdoor warning system please submit an e-mail to: LCEMA@laramiecountywy.gov




2015 Additions

Outdoor-Warning-System.pdf(PDF, 129KB)



Contact: Rob Cleveland Office: (307) 633-4333


County receives, installs new Outdoor Warning Sirens


(Cheyenne, Wyo.) -- Fifteen new Outdoor Warning Sirens will be installed throughout Laramie County to warn county resident of an impending emergency. The addition of the new sirens brings the total to 64 countywide.


During an actual emergency, when residents hear the sirens they should take cover immediately and tune to a local radio or television station to receive additional emergency information. The sirens are an all-hazards emergency warning system and are intended to warn residents of any life threatening situation in the area.


The sirens are tested the first Friday of each month at noon. (10 a.m. in Pine Bluffs). The warning sirens will sound a steady signal for a period of one to three minutes. Cancellation of the test may occur due to inclement weather.


The new sirens will be located in the area of the following locations:


1. Dildine Elementary


2. Reese Rd & Beckle Rd


3. E Four Mile Rd & Westedt Rd


4. Horsecreek Rd & Roundtop Rd


5. Murray Rd & Avenue C


6. South Fork Park


7. Ceder Ave & Citrus St


8. Swan Ranch


9. New Bedford Dr


10. Anderson Elementary


11. Wills Rd & Rock Springs St


12. Welchester Dr


13. West College Drive


14. Curt Gowdy State Park


15. Replacement Siren Downtown on City Building


Sirens purchased with 6th Penny Specific Purpose Optional Tax Funds