* 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. 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.

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

The officials at the Office of Sustainability for the City of Indianapolis have called for a Knozone Action Day, IN EFFECT FROM MIDNIGHT WEDNESDAY NIGHT TO MIDNIGHT EDT THURSDAY NIGHT. A Knozone Action day means that a combination of high temperatures, light winds, and other factors are expected to produce conditions where high levels of ozone emissions may exceed federally mandated standards. 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

The Indiana Department of Environmental Management has declared an Air Action Day, from midnight Wednesday night to midnight EDT Thursday night. 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, please visit the IDEM Smog page at: https://www.apps.idem.in.gov/smogwatch.

* 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.

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.

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.