* WHAT. Heat index values up to 97. * WHERE. Portions of central, south central, southwest and west central Michigan. * WHEN. Until 8 PM EDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur.

* WHAT. High wave action, strong currents, and dangerous swimming conditions expected. Piers may be heavily swamped by waves. * WHERE. Mason, Oceana and Muskegon counties. * WHEN. Through Wednesday afternoon. * IMPACTS. Strong currents can pull swimmers into deeper water and high waves can sweep people off piers. * ADDITIONAL DETAILS. The southern side of any structures will be the most dangerous areas with the south to southwest winds..

* WHAT. South winds 10 to 20 knots with gusts up to 30 knots and waves 2 to 5 feet. * WHERE. Grand Haven to Manistee. * WHEN. Until 4 PM EDT Wednesday. * IMPACTS. Conditions will be hazardous to small craft.

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/

* WHAT. Heat index values of 95 to 100 degrees expected throughout the week. Low temperatures in the 70s at night will provide little relief from the heat. * WHERE. Portions of northern Indiana and southwest Michigan. * WHEN. Until 8 PM EDT /7 PM CDT/ Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Heat stress increases with the number of consecutive hot days. While heat indices may be slightly lower Today because of cloud cover and chances for showers and storms, hot conditions are forecast again for Wednesday through Saturday. The effects of heat are most impactful for more vulnerable urban populations.