textproduct: Jackson

KEY MESSAGES

- A progressive cold front brings showers and numerous thunderstorms to the area on Friday, with a risk for gusty winds and locally heavy rainfall within the strongest storms.

- High pressure briefly ushers in cooler and drier air on Saturday, but unsettled weather and widespread rain chances return overnight into Sunday.

- Expect cooler than normal temperatures early next week as broad troughing dominates the weather pattern aloft.

UPDATE

Issued at 1145 PM EDT THU JUN 11 2026

Latest CAMs guidance suggest that the CWA stays quiet through dawn as the convection with the approaching front basically fades out to our west towards 12Z. Accordingly, no significant changes were made to the forecast with mainly just the inclusion of the latest obs and trends for the T/Td/Sky grids. These minor adjustments have been sent to the NDFD and web servers along with a freshening of the zones.

UPDATE Issued at 730 PM EDT THU JUN 11 2026

23Z sfc analysis shows high pressure to the southeast effectively in control of the weather over eastern Kentucky. To the northwest, a approaching cold front is pushing a cluster of thunderstorms steadily toward the area but these not expected to impact anything here until closer toward dawn - if at all. The nearby high is helping to clear the sky and settling the winds. Currently, temperatures are running in the very warm mid to upper 80s. Meanwhile, amid southwest winds of 5 to 10 mph with some gusts up to 15 mph, dewpoints are generally in the quite humid upper 60s to lower 70s. This level of moisture in the air resulted in heat indices approaching 100 degrees in a few spots this afternoon. Now, though, conditions are improving with the approaching sunset. Have updated the forecast mainly to add in the latest obs and trends for the T/Td/Sky grids. Did also tweak the PoPs and thunder chances through dawn per the latest CAMs guidance. These minor adjustments have been sent to the NDFD and web servers along with a freshening of the SAFs and zones.

LONG TERM

(Saturday night through Thursday) Issued at 135 AM EDT FRI JUN 12 2026

The long term forecast period will be governed by broad troughing over the northeastern quadrant of the contiguous United States. As an upper level low spins over Ontario and Quebec through much of next week, and a series of shortwave troughs will eject around its backside and into the Greater Ohio River Valley in this time frame. Confidence is high that the first disturbance will approach the forecast area from Saturday night into Sunday, giving credence to the notion that widespread rain chances will return to the forecast area in this time frame. While models are in generally good agreement regarding this first disturbance's timing, there is still some uncertainty surrounding its amplitude. That limits forecast confidence in any potential sensible weather impacts at the current moment. Similar themes linger through the rest of the long term forecast period. Increasing model spread makes it difficult to pinpoint the specific precipitation forecast details during the subsequent shortwave passages, but each disturbance looks to reinforce the overarching troughing pattern aloft. Such a pattern favors cooler than normal temperatures, and this is reflected in the temperature forecast for next week.

When the period opens on Saturday evening, all eyes will be on the potential for upstream convection. If the more amplified model solutions come to fruition, a sharper shortwave trough could provide sufficient dynamic support for stronger storms on Saturday night in western portions of the commonwealth. Some of the available machine learning, analog, and AI-enhanced forecast guidance supports this idea, but by the time any activity reaches our forecast area, it will be working against the diurnal instability cycle. Rain chances do not reach our Lake Cumberland counties until after midnight on Sunday morning, and the storms could be moving into a stable boundary layer by then. Given the antecedent high pressure in place, it is plausible for valley locales to thermally decouple after sunset. This would allow efficient radiational cooling to take root, and in accordance with local climatological knowledge, modest ridge valley splits and patchy valley fog were added to the forecast grids for this time frame. Assuming convective cloud debris doesn't interrupt these classic diurnal processes, eastern valleys should dip down into the upper 50s/lower 60s by midnight. West of I-75, temperatures will stay in the mid/upper 60s, as this is where the greatest sky cover and the greatest thunderstorm chances are forecast. Model soundings resolve only meager amounts of mostly- elevated CAPE by then though, so storms would likely succumb to a weakening trend as they approach I-75. Furthermore, they will likely be outrunning the better dynamic support aloft.

The parent shortwave axis reaches our portion of the Ohio River Valley on Sunday afternoon and evening. The European family of forecast guidance models continues to resolve a sharper iteration of this disturbance than its American counterparts, but both agree in an arrival time that overlaps with peak diurnal heating. The magnitude of said heating will likely depend on the evolution of the overnight/AM activity and how much cloud cover it leaves behind, which will then determine the instability parameter spacing for any frontally forced PM convection. Mesoscale details like this are hard to determine at the current temporal range, but based on the medium- range convective guidance, the greatest chances for stronger storms on Sunday may be in southern and southeastern portions of the commonwealth. Thankfully, this system looks progressive, and relatively cooler and drier air works its way into the forecast area after frontal passage on Sunday night. This will help to reduce the risk for hydrological impacts, but we will need to watch the effects of today's convective activity on soils in the Cumberland basin before we completely write this system off.

The aforementioned post-frontal CAA will yield pleasant conditions in Eastern Kentucky to start the next work week. We will be waking up to AM lows in the 50s on Monday, Tuesday, and Wednesday mornings next week, with afternoon highs in the upper 70s/lower 80s. Mean PWATs in the LREF data generally dip to below 1 inch in this time frame, so apparent temperatures will be very close to these forecast thermometer readings. In other words, it will feel fantastic outside for the first half of the work week. A second shortwave could spark a stray shower or two in SE KY on Monday, but it will be working with less moisture and lower temperatures than its predecessor. Most of the area will likely stray dry and enjoy mostly sunny conditions early next week, with the next shot at area-wide rain chances holding off until a third, better-defined shortwave approaches on either Wednesday or Thursday. As discussed in the introductory paragraph, there is too much compounding forecast uncertainty to highlight sensible weather specifics that far out. In the meantime though, readers are encouraged to get outside and enjoy this pleasant summertime weather forecast!

AVIATION

(For the 00Z TAFS through 00Z Friday evening) ISSUED AT 805 PM EDT THU JUN 11 2026

Weak surface high pressure will keep the area dry through the night. Clearing skies this evening and early overnight will give way to increasing and lowering clouds ahead of a cold front towards dawn as it dives southeast into this part of the state just after 12Z/Friday. PROB30s are in place to account for pulse thunderstorm development ahead of the front through at least the start of the afternoon for all terminals on Friday. Any thunderstorm that develops at or near a TAF site could bring brief reduction in category; as well as, gusty and erratic outflow winds. Southwesterly winds are expected throughout the night, but mainly below 10 kts before picking up again Friday morning ahead of the approaching front. For Friday winds will be out of the southwest sustained at around 10 kts with gusts to 15 kts.

JKL WATCHES/WARNINGS/ADVISORIES

None.