textproduct: Louisville

KEY MESSAGES

* Seasonably mild weather will kick off the week with highs generally in the 70s through Tuesday. Many locations will climb back into the 80s Wednesday through Saturday.

* Overnight low temperatures may fall into the upper 30s in low- lying rural areas Monday night, but the probability of frost is low.

* Mild-moderate drought conditions, worst over southern Kentucky, will worsen this week as dry weather prevails. The next (40-60%) chance for beneficial rainfall will arrive late Saturday evening into Sunday.

DISCUSSION

Issued at 305 AM EDT Mon Oct 5 2026

Looking at a nearly picture perfect stretch of weather as we enter the first part of the new work week. Expansive high pressure will build into the Great Lakes region today, and then slide ESE to the mid Atlantic Coast by Tuesday. Meanwhile, unremarkable/dry NW flow aloft will dominate the upper pattern. Other than a few high clouds across southern and central KY this morning, this early week pattern will yield virtually cloudless skies and light to steady NNE to ENE winds. Will be kind of interesting to see where temps end up given the full sun, but also a somewhat limiting NE surface flow. Is is creating a fairly impressive spread between MAV/MET guidance for today, and have tended to land in the middle between the milder MAV and much cooler MET. This should yield highs mostly in the mid 70s today and tomorrow.

A very well mixed boundary layer this afternoon will likely yield impressive dry air mix down given mixing heights extending up into a notable hydrolapse above 900mb. Something to be mindful of as we dry out from the weekend rain this upcoming work week.

Look for some crisp to down right cool overnight lows as well given light surface winds and cloudless skies. Radiational cooling should allow for most min temps in the 45-50 degree range tonight, however some lower 40s will be more common across the NE CWA closer to the center of the surface high over the OH/PA/WV confluence. Could see some of the coolest sheltered valleys drop into the upper 30s as they completely decouple from a light surface wind. Not sure we will get cold enough for any frost concerns, but if so, it would be extremely isolated. Unlikely would be a good way to characterize it. Tuesday night lows will could be a touch milder (46 to 51F for most) as the surface high slides east of the area and a very light S surface flow returns by dawn Wednesday. That being said, some low 40s are still expected for the cooler NE CWA valleys.

Wednesday - Sunday...

Slightly warmer than average temperatures and low RH persist throughout the week; especially prevalent Wednesday, Thursday, and Friday, we could see max temps in the mid-80s with min dew points pushing the low-40s. Light surface flow out of the Southwest on Wed and the North/Northwest on Thurs as a weak sfc High sits over the ridge of the Appalachians. A thick mixing layer during the day and the low RH values should prevent the overnight low-level inversion from creating fog except in low-lying river areas. Overnight lows should remain in the upper 40s and low 50s for Wednesday/Thursday/Friday nights.

Saturday and Sunday is a bit of a different story, with a potential for our next rain as tropical moisture pushes its way North. While this is still a week out, the last several model runs have been consistent with the moisture, with the ECMWF being the only outlier. Rainfall totals could see around an inch for the Southern portion of the CWA, with the system creating a sharper gradient of a quarter inch for the Southern Indiana portion. As this occurs, mid- to low- level clouds should set in across the CWA, limiting our decoupling potential at night and keeping RH higher and overnight mins in the upper-50s and low-60s. Daytime highs are a little muggier with higher daytime dewpoints and temps in the low-80s.

AVIATION /06Z TAFS THROUGH 12Z TUESDAY/

Issued at 133 AM EDT Mon Oct 5 2026

Expansive high pressure builds in over the Great Lakes and Ohio Valley regions through this TAF cycle. Expect VFR to prevail as a result. Other than a few high clouds early this morning, look for largely cloudless skies and light to steady NNE to NE surface winds today. Perhaps a few gusts up around 15 mph will be possible this afternoon, otherwise winds slacken again with sunset and skies stay clear later tonight.

LMK WATCHES/WARNINGS/ADVISORIES

KY...None. IN...None.