Take a look at this small 5-mile-wide thunderstorm that exploded over the southwest end of Louisville from around 2:45 - 3:45 am. The storm packed gusty winds (most likely associated with a small microburst), heavy rain, and vivid lightning. As quickly as it blossomed, it collapsed soon after over the same area. About 3,000 LG&E customers were left without power from the storm.
Notice the first image on Stormtracker 3D Doppler radar at 3:26 am of the strong storm, then the second image shows almost nothing just a half hour later. We will have these random stray pop-up showers and storms from time to time through Saturday with the excessive heat. A better chance of scattered storms on Sunday with a cool front arriving to the area.