* WHAT. A prolonged period of dangerously hot conditions with heat index values near 100 degrees. * 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 to occur.

* 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. * 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 prolonged nature of the heat may increase heat stress with time.

An extended period of hot and humid conditions continues across all of Central Indiana through the weekend. Daily high temperatures around or above 90 degrees with heat index values approaching 100 degrees may be hazardous for sensitive and vulnerable populations. Take extra precautions if spending time outside during peak heating of the day.

The officials at the Indiana Department of Environmental Management have declared an Air Quality Action Day, IN EFFECT FROM MIDNIGHT WEDNESDAY NIGHT TO MIDNIGHT EDT THURSDAY NIGHT. An Air Quality Action Day for Ozone has been issued. Ozone levels are expected to be in the Unhealthy for Sensitive Groups range. Active children and adults, and people with respiratory disease, such as asthma should limit prolonged outdoor exposure. Here are some recommended actions that the public can take: * Walk, bike, carpool or use public transportation. * Avoid using the drive-through and combine errands into one trip. * Avoid refueling your vehicle or using gasoline-powered lawn equipment until after 7pm. * Turn off your engine when idling for more than 30 seconds. * Conserve energy by turning off lights or setting the air conditioner to 75 degrees or above. For additional information, please visit the IDEM Smog page at: https://apps.idem.in.gov/smogwatch

An extended period of hot and humid conditions continues across all of Central Indiana through next weekend. Daily high temperatures around or above 90 degrees with heat index values approaching 100 degrees may be hazardous for sensitive and vulnerable populations. Take extra precautions if spending time outside during peak heating of the day.

The officials at the Indiana Department of Environmental Management have declared an Air Quality Action Day, IN EFFECT FROM MIDNIGHT TONIGHT TO MIDNIGHT EDT THURSDAY NIGHT. An Air Quality Action Day for Ozone has been issued. Ozone levels are expected to be in the Unhealthy for Sensitive Groups range. Active children and adults, and people with respiratory disease, such as asthma should limit prolonged outdoor exposure. Here are some recommended actions that the public can take: * Walk, bike, carpool or use public transportation. * Avoid using the drive-through and combine errands into one trip. * Avoid refueling your vehicle or using gasoline-powered lawn equipment until after 7pm. * Turn off your engine when idling for more than 30 seconds. * Conserve energy by turning off lights or setting the air conditioner to 75 degrees or above. For additional information, please visit the IDEM Smog page at: https://apps.idem.in.gov/smogwatch

* WHAT. A prolonged period of dangerously hot conditions with heat index values near 100 degrees. * 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 Saturday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Dangerously hot conditions with heat index values of 95 to 102 through 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. 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.