textproduct: Louisville

KEY MESSAGES

* Warm days, cool nights, and dry weather continues through Friday. Patchy morning fog (especially in river valleys) will continue, with the exception of Wednesday morning.

* The next significant chance for widespread rainfall is not expected until this weekend, with the highest confidence in rain (60-70%) occurring late Saturday night into Sunday morning.

DISCUSSION

Issued at 237 AM EDT Tue Oct 27 2026

Today through Friday Night...

Fairly similar conditions to previous days are present across the area this morning, with temperatures ranging from around 40 degrees in the coldest valleys to the mid-to-upper 50s in urban areas and higher elevations as of 06Z. Satellite imagery shows a relative minimum in high cirrus clouds over the area this morning; however, these should increase again through the day, bringing filtered sunshine later today. From now through mid-morning, the main impact will again be the development of fog in river valleys and other sheltered areas. While some of this could be locally dense, coverage should remain confined enough to keep impacts to a minimum.

As previous discussions have noted, steady/persistent conditions are expected through Friday. The synoptic pattern will feature mean troughing across the western CONUS with ridging across the southeast US. A few shortwave disturbances ejecting across the Plains and into the Great Lakes region will bring extra mid- and high clouds and slightly stronger SW winds through the mid-week period; however, dry air below 20k ft AGL will preclude precipitation chances. High temperatures each afternoon will be in the mid-to-upper 70s for most, and a few locations may approach 80 Thursday and Friday. Large diurnal ranges will allow temperatures to fall into the 40s and low 50s each night until Friday night, when increasing moisture should hold temperatures in the 50s.

The main weather impact through Friday will be increasing precipitation deficits and worsening drought conditions across the area, as has been well covered in previous discussions. Recent collaboration with area fire weather partners revealed that small fuels humidity values aren't too concerning thanks to good nighttime recovery of atmospheric RH. Additionally, the combination of light winds and intermittent high clouds limiting afternoon mixing should keep fire weather conditions fairly tame over the next several days.

Saturday through Monday Night...

The static weather pattern is expected to come to an end this weekend, with a shift in the large-scale pattern gradually taking place between Saturday and the middle of next week. The main western US troughing is expected to remain fairly fixed through the first half of the weekend; however, energy associated with the remnants of TS Vance (E. Pacific) should get caught up in SW flow across the central CONUS and eject into the Mississippi Valley Saturday into Sunday. As this disturbance gets pulled toward our region, moisture will increase as a plume of 1.25"+ PWATs advects in from the southwest. Most of the day on Saturday still looks dry at this time, with precipitation chances increasing from SW to NE during the evening hours. Still, the highest ensemble probabilities (60-70%) of measurable rainfall arrive after midnight into Sunday morning. Overall, this system should bring fairly light rain amounts, with current ensemble median values ranging from 0.10-0.40" across the CWA.

This lead disturbance should eject to the east by the end of the weekend, with the main mid-latitude trough ejecting across the Plains and toward the eastern CONUS early next week. There is still quite a bit of spread with how this wave evolves, resulting in a wide range of weather outcomes for early-to-mid next week. The general signals in medium-range guidance support a more active weather pattern with additional chances for rain (possibly storms) during the first few days of November. Temperatures are expected to gradually trend cooler after Monday as well as lower heights/troughing moves toward the area.

AVIATION /12Z TAFS THROUGH 18Z WEDNESDAY/

Issued at 648 AM EDT Tue Oct 27 2026

VFR conditions expected throughout the TAF period, outside of brief morning fog at BWG and HNB, which should dissipate shortly after sunrise. Expect another day of SCT to BKN cirrus with light winds, mainly out of the SE. Increasing cloud cover overnight should result in less fog Wednesday morning.

LMK WATCHES/WARNINGS/ADVISORIES

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