Emergency Management

Alert Systems

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​​​​CodeREDTM   NOAA Weather Radio   Siren Warning System   Lightning Detection System


Boil-water alerts, flooding and other dangers can strike with little or no warning. If you rely on a cell phone only or have recently disconnected your landline telephone, then it’s more important than ever to sign up for the city’s CodeRED notification system. This could be the city’s only way to reach you in an emergency situation.

The CodeRED™ Emergency Telephone Calling System is used for mass emergency notifications to notify residents and businesses, within minutes, of an emergency or a potential hazard. The system will call each number and will leave voicemail messages on landlines and cell phones.

Register for CodeREDTM

You can select text, cell phone, home phone and even email notification options. When registering, it is important to set up an account so you can manage and update your own contact information. This free and vital service is managed by the City of Ann Arbor office of emergency management. Register now for CodeRED.

PLEASE NOTE: The City of Ann Arbor's CodeREDTM emergency notification system will only contact residents who live within Ann Arbor city limits. It will not notify outlying areas, such as Ypsilanti, Milan, Dexter, Saline, etc.

Registration is simple, just click on CodeRED and:


Enter your name, address and emergency phone number. You may add up to two emergency phone numbers. You must click on the CodeRED™ and enter your name, address and phone number for each emergency phone number to be contacted.​.


Each business must put in the word “business” in the first name field, and the complete business name in the last name field. You may add up to two emergency phone numbers. You must click on the CodeRED™ and enter your name, address and phone number for each emergency phone number to be contacted.

Miss the call? When a CodeRED™ message is disseminated, the phone number that will appear on your caller ID is: 866-419-5000. If you missed the phone call or message, or need to hear the message again, you can call this number and hear the last message that was sent to your phone number. 

NOAA Weather Radio

It is recommended that you purchase a National Oceanic and Atmospheric Administration (NOAA) weather radio with SAME technology (specific area message encoding), available at local electronics stores. This will allow you to program your radio for Washtenaw County and receive alerts and information regarding your local weather or other emergencies. These radios will sound an alert if there is an emergency alert system (EAS) warning for your area.

Siren Warning System

The City of Ann Arbor has 22 siren locations throughout city limits. The sirens are tested every second Tuesday of the month at 1 p.m., with a one-minute wail. Testing of sirens is performed from March through October.

Washtenaw County sirens are tested on the first Saturday of the month at noon from March through September.

The sirens are an outdoor warning system only. They are not intended to be heard indoors. If you he​ar them while indoors, consider yourself fortunate for the advance warning. Please call the office of emergency management at 734.794.6980 if you are outdoors and do not hear the sirens on the scheduled time and day of the testing.

When the sirens are actually activated, it can be for various reasons. These include:

  • Tornado warning anywhere in Washtenaw County.
  • Severe thunderstorm warning with confirmed winds of 75 miles per hour or greater anywhere in Washtenaw County.
  • A hazardous material spill that requires immediate protective action.
  • Any other local emergency that requires immediate action or for other national threats such as an imminent threat alert from the U.S. Department of Homeland Security - National Terrorism Advisory System.

When the sirens are activated, you are advised to “go in / tune in.” Immediately go inside, take cover in a safe area and listen on your battery-operated radio to the local EAS radio stations for official information:

  • WEMU 89.1 FM
  • WWWW 102.9 FM
  • WQKL 107.1 FM
  • WTKA 1050 AM
  • WLBY 1290 AM

Emergency alerts will also be broadcast on Community Television Network (channels 16, 17, 18 and 19), emailed to “emergency alerts” e-subscribers, and shared via the city’s Facebook and Twitter pages.

Sirens will sound for three minutes with a steady wail in the event of an actual emergency. There will not be an “all-clear” alert from the sirens. Listen, instead, for an all-clear announcement to be broadcast on the radio.

Siren locations 

  • West Ellsworth and Varsity Drive.
  • Eisenhower Parkway and South Main Street.
  • Verle Avenue and Eddy Street.
  • Platt Road and Washtenaw Avenue.
  • Page Avenue and Jewett Avenue.
  • Las Vegas Drive and Runnymead Boulevard.
  • Koch Avenue and Third Street.
  • Geddes Avenue and Geddes Heights Drive.
  • Fuller Court West of Huron Parkway.
  • Hubbard Street and Green Road.
  • Murfin Avenue and Hayward Street.
  • Summit Street and Hillcrest Drive.
  • Dexter Avenue and North Maple Road.
  • Newport Road and Warrington Drive.
  • Pontiac Trail and Skydale Drive.
  • Nixon Road and Haverhill Court.
  • Devonshire and Belmont.
  • East University and Tappan.
  • Gralake and Central Avenue.
  • Detroit Street and North Fifth Avenue.
  • Lambeth Drive and Ascot Road.
  • Earhart Road and Geddes Road.

Lightning Detection System

The city also has a lightning detection warning system, Thor Guard, installed at some of the City of Ann Arbor parks and recreation facilities. The Thor Guard lightning warning system senses the "chance of lightning," not necessarily the occurrence of lightning. Therefore, the system activates even if there is no lightning detected. The system senses the chance of lightning within about a 5-mile area around the main sensor, by measuring the static electricity between earth and sky. 

All the systems are equipped with programmable timers, so they are not set to alarm between 11 p.m. and 7 a.m. when there are no swimmers, golfers or park users. Sirens sound to warn park users and facility managers to take appropriate precautions (all swimmers out of the pool, golfers off the course, etc.). The Thor Guard air horns’ audible range is about 2,000 feet from each detection system. When the system detects lightning, there will be one long tone (approximately 30 seconds). The all-clear siren will be three short horn blasts (approximately 10 seconds long). 

Sensor locations

  • Buhr Park Pool roof.
  • Fuller Park Pool roof.
  • Gallup Park Livery roof.
  • Huron Hills Golf Course clubhouse, pump building on Huron River, west side of Huron Parkway (500 yards south of the clubhouse).
  • Leslie Park Golf Course clubhouse roof, sixth hole on the green, 14th hole on the green.
  • Veterans Memorial Park Ice Arena roof, ball fields (light pole, 200 yards north of ice arena).

Subscribe to email updatesSign up for the city's CodeRED notification system
301 E. Huron St.
Ann Arbor, MI 48104
Fax: 734.994.4635

In emergency situations, call 9-1-1
Police nonemergency line 734.994.2911
Fire nonemergency line 734.794.6978