* WHAT. Heat index values up to 108. * WHERE. Crawford MO, Washington MO, Iron MO, Madison MO, Reynolds MO, and Saint Francois MO Counties. * WHEN. Until 7 PM CDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 105. * WHERE. Bond IL, Clinton IL, Fayette IL, Marion IL, Montgomery IL, Calhoun IL, Greene IL, Jersey IL, and Macoupin IL Counties. * WHEN. Until 7 PM CDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Dangerously hot conditions with heat index values up to 110. * WHERE. Portions of central, east central, and southeast Missouri. * WHEN. Until 7 PM CDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Dangerously hot conditions with heat index values up to 110. * WHERE. Washington IL, Madison IL, Monroe IL, Randolph IL, and Saint Clair IL Counties. * WHEN. Until 7 PM CDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Dangerously hot conditions with heat index values of 110 to 115 degrees. * WHERE. Portions of southern Illinois, western Kentucky, and southeast Missouri. * WHEN. Until 8 PM CDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS. Isolated to widely scattered thunderstorms Thursday afternoon may provide limited relief from the heat.

The Flood Warning continues for the following rivers in Missouri. Illinois. Mississippi River at Louisiana. Mississippi River at Clarksville. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT. Minor flooding is occurring and minor flooding is forecast. * WHERE. Mississippi River at Clarksville. * WHEN. Until Thursday evening. * IMPACTS. At 25.3 feet, The road to Port Marmac, a riverside community of about 15 homes just south of Clarksville, begins flooding. * ADDITIONAL DETAILS. - At 9:00 PM CDT Tuesday the stage was 25.3 feet. - Recent Activity. The maximum river stage in the 24 hours ending at 9:00 PM CDT Tuesday was 25.8 feet. - Forecast. The river is expected to fall below flood stage early tomorrow afternoon and continue falling to 21.1 feet Tuesday, August 06. - Flood stage is 25.0 feet.

The Flood Warning is extended for the following rivers in Illinois. Missouri. Mississippi River at Louisiana. Mississippi River at Clarksville. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT. Minor flooding is occurring and minor flooding is forecast. * WHERE. Mississippi River at Clarksville. * WHEN. Until Monday afternoon. * IMPACTS. At 25.5 feet, State Route P east of Elsberry begins flooding just east of the levee. * ADDITIONAL DETAILS. - At 10:30 AM CDT Wednesday the stage was 25.1 feet. - Recent Activity. The maximum river stage in the 24 hours ending at 10:30 AM CDT Wednesday was 25.5 feet. - Forecast. The river will fall below flood stage this afternoon to 24.9 feet tomorrow morning. It will then rise above flood stage early tomorrow afternoon to 26.1 feet Friday evening. It will fall below flood stage again late Sunday morning. - Flood stage is 25.0 feet.

The Flood Warning is extended for the following rivers in Illinois. Missouri. Mississippi River at Louisiana. Mississippi River at Clarksville. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT. Minor flooding is forecast. * WHERE. Mississippi River at Clarksville. * WHEN. Until early Monday afternoon. * IMPACTS. At 25.5 feet, State Route P east of Elsberry begins flooding just east of the levee. * ADDITIONAL DETAILS. - At 9:30 PM CDT Wednesday the stage was 25.0 feet. - Forecast. The river will rise to 25.9 feet early Saturday morning. It will then fall below flood stage late this evening. - Flood stage is 25.0 feet.