* 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.

An extended period of hot and humid conditions is expected across all of Central Indiana through next weekend. Daily high temperatures in the low to mid 90s with heat indices approaching 100 during the afternoon hours may be hazardous for sensitive and vulnerable populations. Take extra precautions if spending time outside during peak heating of the day.

The combination of hot and humid conditions will result in peak heat index values near or slightly exceeding 100 degrees this afternoon and evening. If working or spending an extended period of time outside today, remember to drink plenty of water and take breaks in the shade or air-conditioned areas. Loose-fitting and light-colored clothing is recommended. Be sure to check on those most vulnerable to heat, including children, the elderly, and anyone without access to air conditioning. Provide shade and fresh water for outdoor pets and livestock. Remember to always look before you lock! Never leave children or pets unattended in a parked vehicle. The interior of a vehicle can reach deadly temperatures in a matter of minutes.

The Southwest Ohio Air Quality Agency has issued an Air Quality Advisory for Butler, Clermont, Hamilton and Warren counties in Ohio; Boone, Campbell and Kenton counties in Kentucky; and Dearborn County in Indiana, 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 information, please visit the Southwest Ohio Air Quality Agency's web site at www.southwestohioair.org/local_air_quality

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