513 FXUS63 KLMK 280544 AFDLMKArea Forecast Discussion National Weather Service Louisville KY 144 AM EDT Sun Sep 28 2025
...Updated Aviation Discussion...
.KEY MESSAGES...
* Patchy fog possible Sunday morning.
* Warming temperatures expected through Tuesday.
* Some uncertainty for next week, but the forecast remains mostly dry and warm.
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.UPDATE... Issued at 831 PM EDT Sat Sep 27 2025
Mid-evening satellite imagery shows clear skies across the region. Temperatures were already showing the typical ridge/valley split with the valleys in the low-mid 60s and the ridges still in the upper 60s to around 70. Current forecast for the overnight continues to look on target. Clear skies and light winds should result in some patchy fog formation, especially in the low-lying and river valley locations. Did a quick refresh of the grids to bring grids in line with obs. Updated products will be available shortly.
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.SHORT TERM /THROUGH TONIGHT/... Issued at 231 PM EDT Sat Sep 27 2025
High pressure is over the region and a weakening upper low has allowed for an afternoon Cu field to develop over the region and temperatures to warm into the upper 70s and low 80s. This Cu field will dissipate around sunset this evening.
The upper low will continue to weaken and push off to the northeast, as building ridging moves in from the west. This will help to keep clear skies and light winds over the region tonight and tomorrow. Given rising heights over the region, we will expect temperatures to be a bit warmer than today. Lows are expected to be in the mid-to- upper 50s and low 60s in urban areas. Highs are expected to be in the low-to-mid 80s.
With clear skies and light winds, could see some patchy fog development, especially in river valley areas in the morning.
Given the dry upper profile, we could see some mild dry air mix down which would bring dew points into the low-to-mid 50s over most of the area. Some spots which could briefly touch the upper 40s during peak heating.
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.LONG TERM /MONDAY THROUGH SATURDAY/... Issued at 231 PM EDT Sat Sep 27 2025
===== Monday - Monday Night =====
Ridging aloft and surface high pressure centered just to the northeast of the region will allow continued warm and dry conditions. Temperatures may be around 10 degrees warmer than normal Monday afternoon.
Tropical Cyclone Nine will be just off the Atlantic Coast of central Florida and likely sling moisture NW into the Appalachians, but likely not making it much further.
===== Tuesday - Friday =====
As Tropical Cyclone Nine moves north and just off the coast of Georgia and South Carolina, moisture will continue to push NW into the Appalachians, where some moisture will enter eastern Kentucky. Still expecting dry conditions over central Kentucky and southern Indiana, but wouldn`t rule out a few brief showers over our far eastern counties Tuesday and Wednesday.
Otherwise, as the tropical system nears the mid-Atlantic coast and stalls, it will work to break down the ridging and allow heights to fall. This will bring temperatures back to near normal values by the end of the week.
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.AVIATION /06Z TAFS THROUGH 12Z MONDAY/... Issued at 143 AM EDT Sun Sep 28 2025
High pressure will bring fair weather and VFR conditions to the region during this forecast period. Some brief fog does look possible early this morning, but mainly at HNB. Otherwise, clear skies with light northeast winds. Winds will briefly increase to 6- 10 kts this afternoon and early evening.
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.LMK WATCHES/WARNINGS/ADVISORIES... KY...None. IN...None.
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UPDATE...MJ SHORT TERM...SRW LONG TERM...SRW AVIATION...EBW
NWS LMK Office Area Forecast Discussion