* WHAT. Heat index values up to 110 expected. * WHERE. Portions of east central and northeast Kansas and central, north central, northwest, and west central Missouri. * WHEN. Until 8 PM CDT Tuesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Flooding caused by excessive rainfall is possible. * WHERE. Portions of Illinois, including the following areas, Bureau, Hancock, Henderson, Henry IL, McDonough, Mercer, Putnam, Rock Island and Warren, Iowa, including the following areas, Cedar, Des Moines, Henry IA, Iowa, Jefferson, Johnson, Keokuk, Lee, Louisa, Muscatine, Scott, Van Buren and Washington, and northeast Missouri, including the following areas, Clark and Scotland. * WHEN. From 4 PM CDT this afternoon through 7 AM CDT Wednesday morning. * IMPACTS. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS. - Numerous thunderstorms producing very heavy rainfall are expected to develop ahead of a slow moving cold front. Several inches of rain in a short time is possible.

Heat and humidity will build today across much of eastern Iowa, northwest and western Illinois, and northeast Missouri. Heat index readings will rise to the upper 90s to around 100 degrees through early this evening. If you plan to spend time outdoors through early this evening, be sure to stay hydrated by drinking plenty of water, and take frequent breaks in shaded areas or in an air conditioned building. Also, be sure to look before you lock! Don't leave your pets or kids in parked vehicles.

* WHAT. Heat index values up to 115. * WHERE. Portions of east central and northeast Kansas and central, north central, northwest, and west central Missouri. * WHEN. Until 8 PM CDT Tuesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.