When the National Weather Service issues a Tornado Warning or a Severe Thunderstorm with damaging winds at or greater than 70mph for Oakland County, the sirens are activated. This is accomplished in conjunction with local municipal units of government by installing sirens in major population areas.
Oakland County has 266 outdoor warning sirens located on fire stations, utility poles or buildings throughout Oakland County. All sirens are activated by the transmission of an RF signal with a tone alert. The signal is transmitted by the Oakland County Homeland Security Division from a transmitter located on the County Complex at 1200 North Telegraph Road. Each siren has its own receiver and tone decoder.
When sirens are activated a three minute tone indicates a tornado has been sighted or strongly indicated on radar and/or a severe thunderstorm with 70 mph winds or greater is in the area. Seek shelter immediately and listen to radio or television for more information. Do not call police, fire departments or news media.
Each siren is capable of covering about a one mile radius from its location. The sirens are designed to alert citizens who are outside but citizens inside buildings may hear the siren if they are close to the siren location.
It's up to you!
Every year, many people are killed or seriously injured by tornadoes and/or high winds despite advance warning. Some do not hear the warning, while others received the warning but did not take action. This information, combined with timely severe weather watches and warnings, could save your life when severe weather threatens your area. After you have received the warning or observed threatening skies, YOU must make the decision to seek shelter before the storm arrives. It could be the most important decision you will ever make!