* WHAT. Heat index values up to 103 expected. * WHERE. Portions of northeast Kentucky, southeast Ohio, and central, northern, southern, and western West Virginia. * WHEN. Until 8 PM EDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 100. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. Until 8 PM EDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS. Although afternoon thunderstorms have provided cooling relief across many parts of the region, a return to hot and humid conditions will again return on Tuesday and continue throughout the week.

* WHAT. Heat index values up to 101. * WHERE. Portions of east central and southeast Indiana, northeast and northern Kentucky, and central, south central, southwest, and west central Ohio. * WHEN. Until 8 PM EDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 103. * WHERE. Portions of northeast Kentucky, southeast Ohio, and central, northern, southern, and western West Virginia. * WHEN. Until 8 PM EDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values of 100 to 104 degrees are expected at times this week with variability each day due to clouds and scattered showers and storms, especially early in the week. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. Until 8 PM EDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

The Miami Valley Regional Planning Commission and the Regional Air Pollution Control Agency have issued an Air Quality Alert for Montgomery, Miami, Greene, Clark, Preble and Darke counties in the Miami Valley Region, until midnight EDT tonight. Levels of ozone within the region may approach or exceed unhealthy standards. On Alert days, help reduce ozone by taking the following actions: * Carpool, if possible, bike, walk or take the bus instead of driving alone. * Refuel your vehicle after 8 pm. * Do not idle your vehicle, exhaust contributes to air pollution. * Mow your lawn in the evening hours and avoid the use of gas-powered lawn equipment. For additional actions and information, visit miamivalleyair.org or call 937-223-6323