* WHAT. Heat index values up to 100. * WHERE. Lenawee, Livingston, Macomb, Monroe, Oakland, Washtenaw, and Wayne Counties. * WHEN. Until 10 PM EDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values peak in the mid to upper 90s. * WHERE. Lenawee, Livingston, Macomb, Monroe, Oakland, Washtenaw, and Wayne Counties. * WHEN. Until 10 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS. Impacts of heat stress continue to increase with each consecutive abnormally hot day.

* WHAT. Dangerously hot conditions with peak heat index values of 95 to 102 through Saturday. Low temperatures in the 70s at night will provide little relief from the heat. * WHERE. Portions of northern Indiana and northwest Ohio. * WHEN. Until 8 PM EDT Saturday. * IMPACTS. Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS. Heat stress increases with the number of consecutive hot days. Peak afternoon heat indices may be more variable today due to potential isolated thunderstorms, but hot conditions are forecast again for Thursday through Saturday. The effects of heat are most impactful for more vulnerable urban populations.

* WHAT. Peak heat index values of 95 to 100 through Saturday. * WHERE. Portions of northern Indiana and southwest Michigan. * WHEN. Until 8 PM EDT /7 PM CDT/ Saturday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Heat stress increases with the number of consecutive hot days. The effects of heat are most impactful for more vulnerable urban populations.

* WHAT. Heat index values up to 96. * WHERE. Calhoun, Eaton, Ingham, Jackson, Allegan, Barry, Kalamazoo, Kent, Ottawa, and Van Buren Counties. * WHEN. Until 8 PM EDT Saturday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

The Michigan Department of Environment, Great Lakes, and Energy (EGLE) has declared an Air Quality Advisory for June 19th 2024 for elevated levels of ozone in the portions of southwest and west Michigan. Pollutants within those areas are expected to be in the Unhealthy for Sensitive Groups (USG, Orange AQI) range. The Air Quality Advisory is in effect for the following Michigan counties: In West Michigan: Allegan, Berrien, Kent, Muskegon, Ottawa, Van Buren Clouds start to erode in the early afternoon hours on Wednesday near the Lake Michigan shoreline, which will give way to USG-level Ozone concentrations for southwest and west Michigan counties. It is recommended that, when possible, you avoid strenuous outdoor activities, especially those with respiratory diseases such as asthma. People and businesses are urged to avoid activities which can lead to ozone formation. These activities include: refueling vehicles or topping off when refueling; using gasoline powered lawn equipment; using charcoal lighter fluid. Positive activities include: driving less; telecommuting; walking or bike riding; delaying or combining errands; using water-based paints. For further information, please see EPAs Air Now site for up-to- date air quality data: https://www.airnow.gov/