321 FXUS63 KLMK 041738 AFDLMKArea Forecast Discussion National Weather Service Louisville KY 138 PM EDT Sat Oct 4 2025
...Updated Aviation Discussion...
.KEY MESSAGES...
* Dry and sunny weather continue through the weekend.
* Rain chances increase early next week ahead of a cold front arriving on Wednesday.
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.SHORT TERM /THROUGH TONIGHT/... Issued at 338 AM EDT Sat Oct 4 2025
The upper ridge has now pushed eastward, covering the eastern US, while an upper trough with a closed low sits centered just west of the Rockies. Surface high pressure is now centered over the Appalachians and stretches west into the Lower Ohio Valley. This continues to keep quiet weather in place. Things are so quiet with calm winds and clear skies that this morning is going to begin with some patchy fog over much of southern Indiana and central Kentucky, but after the fog clears early in the day, everyone is expected to see mostly sunny skies with temperatures climbing into the low to mid 80s.
Tonight, the upper ridge remains overhead, but with the upper trough and surface low advancing closer to the CWA, southeast winds are expected to remain 3-5 mph. This along with drier conditions should help to limit fog under clear skies. Lows should fall into the 50s.
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.LONG TERM /SUNDAY THROUGH FRIDAY/... Issued at 338 AM EDT Sat Oct 4 2025
Sunday will be the last day to enjoy the upper ridge and surface high pressure keeping dry conditions over the Lower Ohio Valley. Mostly sunny skies will lead to highs in the low to mid 80s.
Monday through Wednesday, guidance continues to slide the upper ridge east off the coast of Maine with the axis of a trailing upper trough off the coast of California. At the surface, the high will sit off the Atlantic Coast, funneling moisture northwest over the Southeast towards the Mississippi and Ohio Valleys ahead of an approaching cold front. Scattered shower and thunderstorm chances along and west of Interstate 65 on Monday will begin to spread east over the whole CWA on Tuesday. Precipitation will begin tapering off to the southeast early Wednesday as the cold front pushes through to the southeast. Ahead of the front, high temperatures are expected to be in the upper 70s to mid 80s on Monday, mid 70s to low 80s on Tuesday, but by Wednesday, highs only reach into the upper 60s in southeast Indiana and northern Kentucky to the upper 70s near Bowling Green.
Thursday into the weekend, cold air advection ahead of a passing surface high dropping southeast through the Great Lakes will keep the upper 60s to mid 70s around for Thursday under mostly sunny skies, but as the high passes, weak warm air advection arrives on Friday, lifting temperatures to the low to upper 70s on Friday and Saturday.
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.AVIATION /18Z TAFS THROUGH 00Z MONDAY/... Issued at 138 PM EDT Sat Oct 4 2025
Winds will generally be out of the south today around 5kts with some scattered afternoon Cu. VFR will remain the main flight categories through the forecast period. Not seeing a strong signal for fog as we go overnight as we did last night so left it out for now. Winds will remain light and out of the south with mainly clear skies through the forecast as ridging aloft and high pressure off the east coast of the CONUS keep weather fair.
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.LMK WATCHES/WARNINGS/ADVISORIES... KY...None. IN...None.
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SHORT TERM...KDW LONG TERM...KDW AVIATION...BTN
NWS LMK Office Area Forecast Discussion