Moderate

* WHAT...Heat index values up to 104. * WHERE...Portions of northwest and west central Illinois, east central and southeast Iowa, and northeast Missouri. * WHEN...Until 7 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in

* WHAT...Visibility of one quarter mile or less in dense fog. The fog is expected to impact the morning commute. Visibilities may change suddenly over very short distances. * WHERE...Benton, Jones, Linn, Buchanan, Delaware, and Dubuque Counties. * WHEN...Until 10 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

* WHAT...Heat index values 99 to 103 expected. Overnight low temperatures in the low to mid 70s. * WHERE...Portions of northern Indiana and northwest Ohio. * WHEN...From 2 PM EDT /1 PM CDT/ this afternoon to 8 PM EDT /7 PM CDT/ Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Heat indices may approach 100 degrees again on Thursday afternoon. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

* WHAT...Heat index values up to 100 expected. Overnight low temperatures in the low to mid 70s. * WHERE...Branch, Cass MI, Hillsdale, Northern Berrien, Southern Berrien, and St. Joseph MI Counties. * WHEN...From 2 PM this afternoon to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Langlade, Lincoln, Oneida, Vilas, Florence, Forest, Northern Marinette County, and Northern Oconto counties. * WHEN...Until 9 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Visibilities in some spots are down to several hundred yards. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

* WHAT...Heat index values up to 104 expected. * WHERE...Portions of east central and southeast Indiana, northeast and northern Kentucky, and central, south central, southwest, and west central Ohio. * WHEN...From 2 PM this afternoon to 8 PM EDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose

* WHAT...Daily peak heat index values from 100 to 108 degrees. * WHERE...Portions of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri. * WHEN...Until 8 PM CDT /9 PM EDT/ Friday. * IMPACTS...Prolonged duration hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Heat index values above 100 degrees may continue into Saturday. Several warm record overnight low temperatures in the mid-70s is possible this week.

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Langlade, Lincoln, Oneida, Vilas, Florence, Forest, Northern Marinette County, and Northern Oconto counties. * WHEN...Until 9 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Several locations early this morning reporting visibilities of 1/4 mile or less. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

* WHAT...Heat index values up to 103 expected. * WHERE...Portions of northeast Kentucky, southeast Ohio, and central, northern, southern, and western West Virginia. * WHEN...From 1 PM this afternoon to 8 PM EDT Wednesday. * IMPACTS...High temperatures and humidity may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Additional information can be found at https://www.weather.gov/rlx as well as on our X and Facebook pages.

* WHAT...Heat index values up to 110 expected. * WHERE...Simpson, Jefferson Davis, Lawrence, Lincoln, Marion, and Franklin MS Counties. * WHEN...From 11 AM this morning to 7 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning