textproduct: Jackson

KEY MESSAGES

- Daily chances for showers and thunderstorms persist across the entire area throughout the week.

- The greatest rain chances are through Wednesday and again Friday. The potential for multiple rounds of locally heavy rainfall poses a risk for isolated flooding in this time frame.

- Warm and rather humid conditions are expected.

UPDATE

Issued at 1028 AM EDT MON JUN 8 2026

Minor adjustments were made based on recent observation and radar trends. This led to slowing down the pop increase in the southwest portion of the area near Lake Cumberland a couple of hours before the next band of convection to the west and southwest moves in.

UPDATE Issued at 800 AM EDT MON JUN 8 2026

Clouds are thickening and lowering across eastern Kentucky at update time as radar shows a band of light rain with trailing clusters of showers and thunderstorms is lifting northeastward across Central Kentucky and Middle Tennessee. The rain should reach the Lake Cumberland area within a couple of hours. However, a stray shower or storm cannot be entirely ruled out ahead of the main band of rain as there is sufficient MUCAPE. It is looking to be a fairly wet day for much of the Cumberland River Basin. Rain chances are slower to arrive with northeastward extent such that the Big Sandy Basin should see mainly dry conditions until late afternoon or early evening.

LONG TERM

(After midnight Tuesday night through Sunday) Issued at 617 AM EDT MON JUN 8 2026

The period is expected to begin with an upper level ridge extending from the Southeast coast into Quebec, with another upper level ridge centered in the ArkLaTex region. In between these features, a slow moving trough should initially extend from the Great Lakes region into the Ohio Valley and Tennessee Valley. Further west, an upper level trough will occupy the western CONUS. At the surface, a front will be draped down from a surface low in the Great Lakes region and reach into the Southern Appalachians, with the boundary extending through far Eastern Kentucky. With southerly to southwesterly winds across the forecast area, continuous moisture advection will support dewpoints in the upper 60s to low 70s, with ample deep moisture in place. 12Z LREF mean PWATs generally range from 1.7 to 1.9 inches at the start of the period, representing the 99th percentile compared to climatology in most of eastern Kentucky. In essence, this pattern will support an extremely moist environment.

Overnight on Tuesday, the upper level ridge over the Southeast will translate east towards the Atlantic, while the trough axis over the Great Lakes will push east into the Appalachians, including eastern Kentucky. An embedded shortwave could provide an additional source of lift for rain overnight into Wednesday, although guidance disagrees on the exact timing and structure of this feature, with the GFS being the most bullish in showing a highly enhanced region of vorticity associated with an MCS pushing into our northern counties. In contrast, other models such as the ECMWF show a more subtle impulse, with a weaker and less focused area of vorticity advection aloft, although the signal for an MCS is still present in many models. With an anomalously moist air mass in place, rain chances will continue into Wednesday, with the highest confidence over the northern portion of our forecast area. Given slow storm motions and this deep moisture, any area that receives multiple rounds of heavy rain could experience localized flooding, with increased flooding concerns if the MCS solution verifies. Should our area end up on the upshear side of an MCS, training cells could dump torrential rainfall on the northern half of the forecast area, although this remains a low confidence outcome at this time. For now, WPC has maintained a Marginal Risk for Excessive Rainfall on Day 2.

Wednesday night, the upper trough axis gradually shifts east of the forecast area. A shortwave ridge will induce a brief period of height rises, with a corresponding lull in convective activity expected. Also during this period, the upper level trough originally over the western CONUS will continue to translate east, eventually moving over the central CONUS by Thursday, with a shortwave axis over the Great Lakes to the mid Mississippi Valley. Although total moisture in the column will decrease somewhat as the ridge axis shifts across the area, with PW dropping back to the 1.5 to 1.7 inch range (90-95th percentile) per the 12Z LREF, surface dewpoints will still remain in the upper 60s to low 70s. Rain chances Thursday will remain dependent on the progression of the upper level ridge and the eastward movement of the aforementioned shortwave trough, with isolated to scattered showers and storms most likely during peak heating on Thursday and perhaps Thursday night depending on the timing of the approaching shortwave and associated frontal zone.

Looking ahead to the weekend, guidance has the shortwave trough crossing the Great Lakes and Ohio Valley, including eastern Kentucky, on Friday afternoon into Friday evening. This will bring another round of rain to our area. Spread remains high going into the weekend, with the general pattern showing ridging centered in the Southwest and into Mexico. Broad upper level troughing will sit over the northern CONUS, with a closed upper level low meandering over Canada. Notably, recent guidance has generally trended further south with this upper level trough; however, models fully diverge on the progression of this trough by Sunday, and there is still low model-to-model and run-to-run consistency in the upper level pattern for the weekend at this time. Regardless, overall, warm and humid weather should persist across the region with chances for convection generally peaking each afternoon and evening.

AVIATION

(For the 18Z TAFS through 18Z Tuesday afternoon) ISSUED AT 235 PM EDT MON JUN 8 2026

Mainly VFR was observed at issuance time, with some MVFR occurring within a slow moving area of convection that was approaching I-75. This band of convection will gradually shift north and east and potentially additional development should occur further east as well. There will the possibility of thunder on station at all the TAF sites at some points during the first 6 hours of the period. Within this convection, MVFR or even IFR reductions are anticipated at times. Guidance still suggest that this convection should gradually diminish to just isolated activity between 3-7Z, followed by increasing coverage from 07Z through the end of the period as a shortwave trough approaches. MVFR or lower reductions are anticipated with that as well. Winds should average light and variable though brief gusts in excess of 20KT are probable within storms.

JKL WATCHES/WARNINGS/ADVISORIES

None.