textproduct: Jackson

KEY MESSAGES

- It will continue to be hot through Friday, with maximum heat indices as high as 100 to 108.

- Showers and thunderstorms are possible at times from Friday through early next week. Storms Friday to Saturday could produce damaging wind gusts and torrential downpours.

UPDATE

Issued at 855 PM EDT THU SEP 3 2026

Some adjustments were made to align hourly temperatures and dewpoints with recent observations which once again indicate valley locations having decoupled. Fog formation should again affect valley locations, especially along area rivers, larger creeks, and area lakes.

LONG TERM

(Saturday through Thursday) Issued at 220 PM EDT THU SEP 3 2026

Saturday will see troughing associated with an upper low over the St Lawrence Valley/Quebec, extending into the ne conus to the Mid Atlantic. By late Friday night into Saturday morning, the aforementioned cold front will sag s through much or all of ern Kentucky, providing another focus for showers and storms. There is still significant model disagreement regarding the timing and extent of convective coverage associated with this frontal passage, resulting in NBM PoPs likely being a bit underdone at least at times compared to true rain chances, although uncertainty remains too high to refine these PoPs at this time. Adding to this uncertainty, some deterministic guidance depicts MCS activity or its remnants diving se out of the Midwest during the day Saturday, following the periphery of the ridge. Although rain appears likely at some point on Saturday, the details continue to remain unclear at this time. The NBM continues to keep pops generally low, maximized mainly in the 20-50% range, to account for this. Meanwhile, nly postfrontal winds will keep highs in the upper 80s on Saturday afternoon, with low 90s near the KY/TN line.

Rain chances look lower from Sunday onward as the upper level ridge begins to expand ewd. With surface high pressure building ne of the forecast area, nely winds will keep Sunday's temperatures cooler than at the start of the period (but still quite warm). Dewpoints look to be modestly lower as well (in the 60s rather than the 70s), and this drier pattern will continue through the end of the period. Even so, Labor Day looks to be quite warm, with above average temperatures in the upper 80s expected across the area. Other than this, the weather will be quite pleasant and sunny, with the exception of an isolated diurnally driven thunderstorm in s or se.

AVIATION

(For the 00Z TAFS through 00Z Friday evening) ISSUED AT 830 PM EDT THU SEP 3 2026

Cumulus has mostly dissipate with a few patches remaining near I-75 and in the Harlan County vicinity. Overall, VFR should prevail for the first 16 to 18 hours of the period with the exception being valley fog. Valley fog should affect some locations between about 04Z and 14Z, with IFR or lower reductions in some cases. At this time, confidence is not high enough to include it at any of the TAF sites as though LAMP guidance suggests it in some areas, persistence supports all 6 sites remaining VFR overnight. Diurnally driven cumulus should develop between 16Z and 18Z with isolated showers or storms possible to end the period. Winds will be light and variable, outside of any isolated storms late.

JKL WATCHES/WARNINGS/ADVISORIES

Heat Advisory until 8 PM EDT Friday for KYZ044-050>052-058>060- 068-069-079-080-083>088-104-106>120.