The outdoor emergency warning sirens in DuPage County are tested on the first Tuesday of every month between 10 and 11 a.m. DuComm, the 911 dispatch center for the city, conducts this test. The purpose of the sirens is to alert those who are outdoors to the threat of danger, either due to weather conditions, a natural or man-made emergency incident, or a National Emergency. In the event of such an emergency, DuComm will activate Warrenville’s outdoor emergency warning sirens. The City’s warning sirens can also be activate by EMA or the on-duty senior police officer.
Knowing what to do when you hear the outdoor emergency warning sirens can save your life.
Seek shelter first. In a basement or the lowest level of a sturdy building, stay close to the most interior wall and away from windows and glass. If outdoors, go to the lowest floor of a nearby sturdy building. If there are no buildings nearby, lie flat in a ditch or depression and cover your head to protect you from flying debris.
After you have reached shelter, seek information about the emergency using phone weather apps, television, or radio. Stay under cover until the warning expires. DO NOT call 911 for information. 911 is to report an emergency. There is no "all clear" siren.
Keep in mind that these are outdoor emergency warning sirens. You might not hear them if you are indoors, especially if you are asleep or in a noisy area. The sirens should not be your only warning mechanism. Be alert to changing conditions when severe weather threatens. Monitor weather reports via NOAA Weather Radio, the Internet, or broadcast radio and television stations.