* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of Illinois, including the following areas, Hancock, Henderson, McDonough, Mercer and Warren, southeast Iowa, including the following areas, Des Moines, Henry IA, Jefferson, Keokuk, Lee, Louisa, Van Buren and Washington, and northeast Missouri, including the following areas, Clark and Scotland. * WHEN...Through Saturday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Some of the flooding may be significant. * ADDITIONAL DETAILS... - Rounds of rain with embedded thunderstorms will occur across the area through Saturday morning with peak hourly rates between 1 to 2 inches from the strongest storms. Rainfall totals will vary considerably across the watch area. The hardest hit areas along and north of Highway 34 could receive 5 to 8 inches of rainfall with isolated higher amounts possible. Flash flooding is a risk with an increased chance of river and creek flooding.