* WHAT...Flash flooding caused by excessive rainfall continues to be possible.
* WHERE...Portions of central and southern Iowa.
* WHEN...Through Thursday morning.
* IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations.
* ADDITIONAL DETAILS... - While showers are ongoing across parts of southern to central Iowa, a band of heavier rain is expected overnight. Already saturated conditions have lowered the needed rainfall for flash flooding impacts.