* WHAT. Dangerously hot conditions with heat index values between 95 and 105 expected throughout the week. Low temperatures in the 70s at night will provide little relief from the heat. * WHERE. Portions of northern Indiana and northwest Ohio. * WHEN. From 11 AM this morning to 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. Hot conditions are forecast for the next five days. The effects of heat are most impactful for more vulnerable urban populations.

* WHAT. Heat index values of 95 to 100 degrees expected. * WHERE. Portions of northern Indiana and southwest Michigan. * WHEN. From 11 AM this morning to 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Heat stress increases with the number of consecutive hot days. Heat indices will range from 93 to near 100 for the next five days, with high temperatures in the upper 80s and low to mid 90s. Low temperatures in the 70s at night will provide little relief from the heat. Monitor for additional heat headlines this week.

* WHAT. Dangerously hot conditions with heat index values between 95 and 105 expected throughout the week. 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. There is a chance that clouds linger from an overnight chance for showers and storms and this could cut into how high heat indices get on Tuesday. However, should clouds scatter out, heat indices could rapidly rise quickly. Heat stress increases with the number of consecutive hot days. Hot conditions are forecast for the next five days. The effects of heat are most impactful for more vulnerable urban populations.

* WHAT. Heat index values of 95 to 100 degrees expected. * WHERE. Portions of northern Indiana and southwest Michigan. * WHEN. Until 8 PM EDT /7 PM CDT/ Tuesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. There is a chance that clouds linger from an overnight chance for showers and storms, which could limit how high heat indices get on Tuesday. However, should clouds scatter out, heat indices could rapidly rise quickly. Heat stress increases with the number of consecutive hot days. Heat indices will range from 93 to near 100 for the next five days, with high temperatures in the upper 80s and low to mid 90s. Low temperatures in the 70s at night will provide little relief from the heat. Monitor for additional heat headlines this week.

* WHAT. Heat index values up to 101 are expected. * 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 Friday. * IMPACTS. The combination of excessive heat due to temperatures in the 90s and high humidity will increase the threat of 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 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