We just closed the books on day 8 in a row in the 90s here in Louisville. We may very well go for 9 straight tomorrow if afternoon scattered storms don't move over the airport before we reach 90°. By the way, tomorrow should be similar to today when it comes to storms. They'll be scattered with heavy rain and lightning. Some bouts of gusty winds are possible with these, but severe weather is not anticipated.
Our attention turns to a disturbance moving in from the Gulf of Mexico that will slam against the stationary front that's over us now. That will act to "squeeze" out some very heavy rain on Thursday, especially in Kentucky. Precipitable water values (PWAT) will be quite high for this event, topping 2 inches (see yellow color in animation tor right). Basically, anything over 1 inch is enough to squeeze out some moderate rain, but once you top that 2 inch mark you start to get more of a torrential, tropical downpour potential.
Rainfall totals by early Friday will be roughly near an inch along and north of the Ohio River but those south of the river could pick up 1-2" with isolated 3-4". Those higher totals would definitely cause some isolated flash flooding concern, so we'll keep an eye on it. At this point this doesn't look widespread or severe, but it's certainly something to keep in mind.
The good news about the rain is that we'll lower our temps this week. An expanded discussion is in the video below!