* 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. South winds to 25 kt and significant waves to 4 ft expected. * WHERE. Illinois and Indiana nearshore from Winthrop Harbor IL to Michigan City IN. * WHEN. Until 10 PM CDT this evening. * IMPACTS. Conditions will be hazardous to small craft.

An Air Quality Action Day has been forecast for Northwest Indiana for elevated ozone levels and is in effect from midnight tonight to midnight Wednesday night. Ozone levels are expected to be at unhealthy levels for sensitive groups. For additional information. please visit the IDEM SMOG Watch web site at www.SmogWatch.IN.gov or the EPA AIRNOW web site at www.airnow.gov and click on Indiana.

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.

* WHAT. Dangerously hot conditions with peak afternoon heat index values between 95 and 105 expected throughout the week, especially Thursday and Friday. 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 Friday. * 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. 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.

* WHAT. South winds to 25 kt and significant waves to 4 ft. * WHERE. Illinois and Indiana nearshore from Winthrop Harbor IL to Michigan City IN. * WHEN. Until 10 PM CDT this evening. * IMPACTS. Conditions will be hazardous to small craft.

* 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.