1157 AM CDT
Showers and thunderstorms have begun to expand in coverage across
wester central into north-central Illinois. In collaboration with
DVN, we have expanded the Flash Flood Watch to the remaining
forecast area. Latest radar mosaic shows the corridor of
developing activity to be better focused toward the western
sections of the area. Morning DVN and ILX soundings show
precipitable water values of greater than 1.8 inches with latest
RAP analysis shifting this a bit westward. While far northern and
northwestern areas have seen less rainfall in recent days, the
efficient precip production and potential for multiple rounds of
showers and storms thought that expanding the watch was prudent.
Do not think that the threat has changed much for the original
watch area as high water already exists and showers and
thunderstorms are beginning to develop.