City officials from the Office of Emergency Management and Communications (OEMC), along with the Chicago Department of Public Health, the Department of Family and Support Services and other City departments and sister agencies reminded residents today to be aware of extreme temperatures and take the necessary precautions to avoid heat-related emergencies.

The National Weather Service in Chicago has issued an Excessive Heat Warning, which is in effect until 7 pm CDT Friday, August 13 prompting City officials to activate its Emergency Operations Center.

The heat temperatures this afternoon are expected be in the lower nineties with heat index reaching at or above 100 degrees Thursday and Friday.  Nighttime temperatures are expected in the mid-seventies with a minimum heat index in the upper seventies, which will provide little relief from the oppressive conditions. In addition, Thursday, August 12, is an ozone action day, which is unhealthy for sensitive groups.