textproduct: Jackson

KEY MESSAGES

- A progressive cold front brings showers and numerous thunderstorms to the area on Friday, with a risk for strong wind gusts 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 1000 AM EDT FRI JUN 12 2026

Made upwards adjustments to PoPs for the next few hours with a decaying MCS traversing the area, with highest PoPs expected in the south where there is greater instability. Other adjustments were quite minor, such as updating the hourly forecast with the latest T/Tds.

UPDATE Issued at 820 AM EDT FRI JUN 12 2026

Convection over central KY continues to approach the region with gusty winds in a few spots from time to time. Winds recently gusted to 40 mph at KLEX upstream. There remains uncertainty with the evolution of upstream convection as it moves east into eastern KY, but recent HRRR runs may have a bit better handle on it. If that materializes convection would move across the area this morning to early afternoon with perhaps some development in the evening along the cold front itself. For now, grids were updated based on recent observation and radar trends.

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 12Z TAFS through 12Z Saturday morning) ISSUED AT 815 AM EDT FRI JUN 12 2026

At issuance time, convection was approaching the region from central KY, though uncertainty remains with the evolution of this activity this morning. At present VFR was reported. At issuance, probabilities appeared greater for convection to reach KSYM and KIOB between 12Z and 15Z as upstream activity arrives. This activity has developed a bit further south since issuance and KLOZ and KSME and possibly KJKL may also be affected during the first 3 hours of the period. Additional activity may occur between 18Z and 00Z and PROB30s were included for convection for a few hours at all sites during that timeframe. Chances may linger beyond 00Z for the 4 more southern/southeastern TAF locations based on trends since issuance. Otherwise, any thunderstorm that develops at or near a TAF site should bring brief reductions to MVFR or IFR or not briefly lower; as well as, gusty and erratic outflow winds. Southwesterly to west winds should increase to near 10KT through 18Z. Winds will trend northwesterly between 18Z and 00Z and then gradually weaken to light and variable to end the period. As high pressure builds in and winds slacken late in the period, fog should affect valley locations by 04Z and after and some or all of the TAF sites could also experience fog lifting into them mainly from 06Z onward.

JKL WATCHES/WARNINGS/ADVISORIES

None.