Heat and Humidity Return...But Are Cooler Days Ahead?

Hey folks...Happy Tuesday to everyone and I hope you had a fantastic Labor Day holiday weekend. We really couldn't' have asked for a better stretch of weather to begin to September and the timing was impeccable for the holiday weekend/ late last week and into the early part of the weekend we saw below average temperatures, pleasant temperatures and lots of sunshine. The bottom line...it was GREAT! But as predicted, we did the "stair step" approach to the warm-up over the second half of the holiday weekend with each day getting a touch warmer with a little more in the way of humidity.

By Labor Day...it felt like typical early September weather across Kentuckiana with highs back into the low 90s and humidity levels higher, but at least not off the charts! We should continue that trend of heat and humidity into the mid week with highs into the low and mid 90s and heat indices occasionally approaching the upper 90s in spots, especially on Wednesday and into Thursday. High pressure will continue to dominate into the mid-week. Even though most locations will remain dry, with the heat and moisture around we can't rule out a stray pop-up storm during the afternoon hours. 

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By Thursday, a weak front will be laying just to our north so the chances for a few scattered showers and storms will be on the increase, especially across our Southern Indiana counties. If you manage to see a passing shower or storm, consider yourself lucky as the heat will still be in full force with highs into the mid 90s for areas that remain dry. 

Our bigger changes will arrive as we roll into the upcoming weekend as a stronger cold front takes aim on the Ohio Valley. Similar to a few of the cold fronts that have moved through over the last month or so...this front will act as a giant "squeegee" and essentially sweep all the heat and humidity out of Kentuckiana. We should legitimately see a solid 10 degree drop in our afternoon highs from Friday into the weekend, not only because of the additional clouds and rain expected on Saturday but due to the cooler air mass that will follow suit. Highs should only be into the low 80s on Sunday with very pleasant conditions as we are rapidly approaching  the time of the year when things finally begin to cool down and we back off the summer heat. 

Speaking of the cool down and the summer heat...typically here in Kentuckiana the first 2 weeks of September is the final "window" where we see consistent 90 degree temperatures or above as our climatological "average" highs really begin to drop off. Our "average" high temperature on September 1st is 87 degrees here in Louisville, but by September 30th the "average" high has dropped to only 76 degrees! That being said, several of the long range computer models are indicating a legitimate shot of some cooler air arriving here in Kentuckiana by the end of NEXT week. A look at our 11 day temperatures trend shows by late next week, we could have afternoon highs only in the 70s!! My point: For all those folks that have had it with the heat and humidity...your time is coming and the likelihood of cooler air finally settling in to the area is growing steadily as each day passes here in September. 

In the short term, stay cool the next few days as we'll be sweating it out for a few more days! Have a fantastic late week and look for another update soon!

Meteorologist T.G. Shuck 


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