Rain has started here from another development in advance of the line, but I think you guys will really get even worse tonight as this line in Kentucky drifts down. Looks like it's going to really gel over your area and you may get another couple inches. The storm you've been under was a bonus storm basically.
These storms are a result of a front and upper low well to our north. They are moving really slow and with these dew points and precipatable water values around 2 inches, you are seeing the result. I won't be shocked if you end up with 4-6 inches of rain by morning.