Look at the Stormtracker 3D Doppler Radar Network image below with all of the thunderstorm activity lining up through the Midwest and Great Plains. What we're watching and tracking are twists or swirls caught up in mid-level flow traveling over the stationary front. Notice where I have each swirl labeled, is where we also have a line of strong storms. Those "swirls" are technically called Mesoscale Convective Vortices - learn more here. These disturbances will eventually add up to a bunch more rain, especially for areas along and north of I-64. Southern Kentucky will end up a bit drier over the next several days.
Total rainfall today through Friday below.