Moderate

* WHAT...Heat index values up to 108 expected. * WHERE...In Louisiana, Catahoula and Concordia Counties. In Mississippi, Rankin, Carroll, Grenada, and Adams Counties. * WHEN...From noon to 8 PM CDT Tuesday. * 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. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

At 1121 AM MDT, Doppler radar was tracking a strong thunderstorm near Zion National Park, moving northeast at 15 mph. HAZARD...Wind gusts of 50 to 55 mph and nickel size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include... Zion National Park and Cedar Breaks National Monument. If outdoors, consider seeking shelter inside a building.

* WHAT...Peak heat index values ranging from the upper 90s to lower 100s Tuesday and Wednesday afternoons. Overnight lows in the low to mid 70s will provide for limited nighttime relief from the heat. * WHERE...Portions of north central, northeast, and northwest Ohio. * WHEN...From 2 PM Tuesday to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Hot and humid conditions will continue on Thursday, and portions of the Heat Advisory may need to be extended.

* WHAT...Peak heat indices of 100 to 105 degrees expected Tuesday and Wednesday afternoons. * WHERE...Portions of northern and central Illinois near and south of I-80, as well as all of northwest Indiana. * WHEN...For the first Heat Advisory, from noon CDT to 9 PM CDT Tuesday. For the second Heat Advisory, from noon CDT to 9 PM CDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of

* WHAT...Peak heat indices of 100 to 105 degrees expected Tuesday and Wednesday afternoons. * WHERE...Portions of northern and central Illinois near and south of I-80, as well as all of northwest Indiana. * WHEN...For the first Heat Advisory, from noon CDT to 9 PM CDT Tuesday. For the second Heat Advisory, from noon CDT to 9 PM CDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of

At 1127 AM MDT, Doppler radar was tracking a strong thunderstorm near St George, or 16 miles east of Virgin River Gorge, moving northeast at 15 mph. HAZARD...Wind gusts of 50 to 55 mph and nickel size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include... St George, Washington, Hurricane, Sand Hollow State Park, Quail Creek State Park, and Bloomington.

* WHAT...For the first Heat Advisory, heat index values up to 105. For the second Heat Advisory, heat index values up to 107 expected. * WHERE...Portions of East Arkansas, North Mississippi, Southeast Missouri, and West Tennessee. * WHEN...For the first Heat Advisory, until 8 PM CDT this evening. For the second Heat Advisory, from noon to 8 PM CDT Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of

* WHAT...For the first Heat Advisory, heat index values up to 105. For the second Heat Advisory, heat index values up to 107 expected. * WHERE...Portions of East Arkansas, North Mississippi, Southeast Missouri, and West Tennessee. * WHEN...For the first Heat Advisory, until 8 PM CDT this evening. For the second Heat Advisory, from noon to 8 PM CDT Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of

* WHAT...Heat index values up to 105 expected. * WHERE...Portions of central, east central, southeast, and west central Illinois. * 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.

* WHAT...Heat index values up to 105 expected. * WHERE...Marshall, McLean, Woodford, Champaign, Edgar, and Vermilion Counties. * WHEN...From 1 PM Tuesday to 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.