textproduct: Paducah

KEY MESSAGES

- Hot temperatures return today and especially Wednesday, with highs in the 90s today, and the middle 90s to around 100 degrees Wednesday. Heat index readings today will be around 100 degrees, and in the 100 to 110 degree range Wednesday.

- An approaching cold front will provide chances of showers and some thunderstorms late Wednesday through Thursday night. The best chances of 75% to 95% will be late Wednesday night through the day Thursday.

- 20-30% chances of showers and storms will linger into Friday and through the weekend.

UPDATE

Issued at 500 PM CDT Tue Sep 8 2026

Updated Aviation discussion for 00Z TAF Issuance.

DISCUSSION

Issued at 140 PM CDT Tue Sep 8 2026

Dry weather continues for the Quad State region today as surface high pressure remains in the east. An elongated area of ridging across much of the southern half of the country has allowed for temperatures to reach the 90s across the area. Heat index values are presently in the mid-90s in the north and near 100 in the south. Patchy cumulus has formed, mainly in the eastern half of the Quad State.

Southerly winds today remain and increase late tonight out of the SSW, with winds rising to 10-15mph tomorrow. The southerly flow will advect moisture into the region from the Lower Mississippi via Arkansas/Tennessee, and keep low temperatures in the low to mid 70s. This warm and moist advection will raise temperatures and heat indices tomorrow. While the NBM initialization may be a bit overzealous on moisture advection, and T/Td were lowered slightly in collaboration with western neighbors as a result, highs in the mid-90s to upper 90s remain forecast for most of the Quad State, with 100 degrees most likely in the Ozarks. Heat indices of 102-108 are forecast (highest in the southwest, lowest in the Kentucky Pennyrile), and a heat advisory has been issued for the entire Quad State region. HeatRisk is level 3 for tomorrow and performed well for the recent hot/dry extreme heat event. Since rain has been difficult to come by of late, this should remain the case for tomorrow.

However, showers and thunderstorms do enter the picture tomorrow, with some models developing a WSW to ENE oriented broken line of convection midday. Others hold off convective activity until later in the afternoon. Any areas which receive midday storms may fall short of heat advisory criteria, and afternoon storms will provide heat relief for those that receive them. Reasonable CAPE and decent lapse rates will be offset by limited shear. DCAPE values over 1000J/kg suggest the primary strong to severe weather hazard will be straight-line winds from downbursts. A marginal risk for severe weather covers approximately the northern half of the Quad State region. Shower and storm activity increases later in the evening and remains off and on through the night and much of Thursday, but severe weather potential drops off Wednesday evening.

A cold frontal passage Thursday will contribute to highs in the 80s Thursday and Friday, but models project the boundary to lift back north Saturday. Lower end precipitation chances remain Friday through Sunday, generally around 20-30%. Sources for showers/storms include moisture streaming near the boundary Friday into Saturday on the southern edge of the Quad State and a weakening system approaching from the northwest during the weekend. Limited precipitation potential remains early next week as high pressure sits over the Mid-Atlantic and activity is most prevalent near the Great Lakes. With ridging slowly building late weekend and lingering to early next week, more highs in the lower 90s are forecast, though conditions should stay below Advisory level criteria.

AVIATION /00Z TAFS THROUGH 00Z THURSDAY/

Issued at 500 PM CDT Tue Sep 8 2026

High pressure still dominates the broader part of the forecast, but there is an approaching front that enters the picture during the planning phase hours of the forecast tmrw. Until then, we'll see diurnal bases expire with loss of insolating fuel, with just FEW-SCT mid to high level bases overnight. Tmrw, said front approaches from the north, introducing PROB30 at KMVN toward the end of the day. Otherwise, lower level bases will have a hard time forming with 100 MB+ of condensation pressure deficits holding firm up to about 6-8K FT AGL, so any BKN CIGS that develop will likely be AOA about 6-8K FT AGL.

PAH WATCHES/WARNINGS/ADVISORIES

IL...Heat Advisory from 11 AM to 8 PM CDT Wednesday for ILZ075>078- 080>094. MO...Heat Advisory from 11 AM to 8 PM CDT Wednesday for MOZ076-086- 087-100-107>112-114. IN...Heat Advisory from 11 AM CDT /noon EDT/ to 8 PM CDT /9 PM EDT/ Wednesday for INZ081-082-085>088. KY...Heat Advisory from 11 AM to 8 PM CDT Wednesday for KYZ001>022.