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Upton, Kentucky Weather Forecast Discussion

682
FXUS63 KLMK 251906
AFDLMK

Area Forecast Discussion National Weather Service Louisville KY 306 PM EDT Thu Sep 25 2025

.KEY MESSAGES...

* A few isolated to scattered showers remain possible this afternoon, but an overall drier trend is forecast.

* Dense Fog could develop in some locations later tonight.

* Mostly dry with warming temperatures expected this weekend.

&&

.SHORT TERM /THROUGH FRIDAY/... Issued at 306 PM EDT Thu Sep 25 2025

The positive tilted upper trough remains over the region today, though the associated jet core is centered more over eastern KY with a speed max over Ohio. GOES satellite imagery shows some breaks in the cloud cover, which had led to sfc temps to be a few degrees warmer across southern KY. We have a ten degree spread ongoing across the forecast area, with Clinton County Mesonet reporting 81, but one of the Shelby County Mesonet sites sitting at 71. SPC Mesoanalysis indicates some elevated PWATs around 1.5", with SBCAPE values around 1000 J/kg across the south. While the entire area could see a light shower or drizzle, the best chances for any afternoon showers and weaker storms will be along and south of the KY Parkways. Coverage will be fairly isolated to scattered, but given the recent heavy rainfall, activity will be worth just keeping an eye on for any minor hydro issues.

Cloud cover continues to break up tonight as any lingering showers diminish in our east. A drier trend will settle in, though the signal is still present for some dense fog development since we have not mixed out much this afternoon. With clearing skycover, should have a decent radiational cooling night combined with leftover moisture from the recent rain. Guidance suggest the best chances for dense fog will be east of I-65, especially in the Bluegrass.

For tomorrow, the upper trough axis is expected to slide across the TN Valley, further removing any associated moisture and forcing from our area. May end up seeing a few more clouds in the east just given the closer proximity to the upper jet over the spine of the Appalachians, but otherwise a mostly sunny day with highs in the upper 70s should be expected. It`ll be a fairly nice day, with temps right on track for this time of year.

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.LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/... Issued at 306 PM EDT Thu Sep 25 2025

===== Saturday - Sunday =====

Mostly dry weather is expected for the weekend, though we will still be dealing with the upper trough over the region as it develops into a weak upper closed low. Weak upper level jet and vorticity will mainly be situated over the Appalachians, focusing the better forcing to the east of our area. Some moisture may work it`s way far enough west to support some isolated shower chances in eastern KY, though building upper ridge over the central US will counter most precip chances. Still can`t rule out a low end chance in our far eastern extent of the CWA, though most of the area should remain dry. Temps are expected to peak in the upper 70s to lower 80s for the weekend, with mostly sunny skycover, though a bit more clouds in the east possible due to closer proximity to the forcing and moisture.

===== Monday - Wednesday =====

Mostly dry conditions are expected to continue into early next week, though this remains a low confidence forecast given the large amount of uncertainty related to the developing tropical systems. The deterministic global solutions tend to have agreement on Invest 94L eventually making a US landfall in the Carolinas early next week, which ultimately should bring increasing chances for showers and storms. In contrast, the ensemble suits show quite a different trend, with little to no agreement in the spaghetti plots, and possibly diverting from a US landfall with influence from TS Humberto. As mentioned in the previous discussion, it will be very interesting to see how models handle the systems and their interactions, possibly with the Fujiwara effect playing out.

Will continue with a mostly dry forecast for now, with an occasional low-end PoP along our eastern border. Temps may start the week slightly above normal, but increasing cloud cover by mid-week could help bring our temps back to near normal.

&&

.AVIATION /18Z TAFS THROUGH 00Z SATURDAY/... Issued at 130 PM EDT Thu Sep 25 2025

MVFR cigs will continue to impact the terminals for a few more hours this afternoon, but do expect improving conditions by this evening. Some isolated showers will be possible across the region, most likely for BWG, LEX, and RGA. Otherwise, clearing skycover will allow terminals to return to VFR for tonight. With light winds and most clear skycover, combined with recent rainfall, some dense fog may develop before sunrise tomorrow for BWG, RGA, and LEX. VFR conditions continue for tomorrow across the area.

&&

.LMK WATCHES/WARNINGS/ADVISORIES... KY...None. IN...None.

&&

$$

SHORT TERM...CJP LONG TERM...CJP AVIATION...CJP

NWS LMK Office Area Forecast Discussion

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