textproduct: Paducah

KEY MESSAGES

- The hottest stretch of the season begins on Tuesday with high temperatures nearing 90 degrees. A combination of the heat and humidity will cause daily heat index values to rise around 105 degrees at times through Thursday, followed by some relief on Friday.

- With the hot and humid airmass providing plenty of instability Tuesday afternoon, a few storms could be strong to locally severe with winds to 60 mph the main threat.

DISCUSSION

Issued at 246 PM CDT Mon Jun 8 2026

Afternoon visible imagery shows an MCV south of St. Louis, which is promoting thunderstorm coverage in southeast MO. We expect convection to redevelop ahead of this feature this afternoon as it encounters a fairly unstable airmass in western KY (MLCAPE 1500- 2000). Model soundings show weak lapse rates and high PWAT values, thus heavy rainfall is the main conern with perhaps some wet loaded microburst potential in the strongest storm cores. With high warm cloud depths, and PWATs above the climatological max for this time of year, these will be very efficient rain producers this evening into tonight. A Flood Watch remains in effect for much of the area through tonight to account for this heavy rain threat.

On Tuesday, there is some uncertainty in how the setup will play out. The latest high-resolution guidance suggests a remnant outlow, on the backside of the passing MCV may help force renewed convection especially in the eastern part of the CWA. Further west, confidence is higher in some potentially dangerous heat building. Dewpoints well into the 70s coupled with temperatures in the upper 80s to low 90s should promote heat index values pushing 105 at times. Therefore, a Heat Advisory has been issued for Tuesday afternoon/evening. Given the expected hot/humid airmass, instbility will also be fairly strong and coupled with at least modest deep- layer shear, a few severe storms capaoble of locally damaging winds will be possible Tuesday afternoon.

Wednesday and will feature a weak ridge attempting to build in front the southwest. This brief ridging aloft should at least temporarily reduce the chances for thunderstorms on Wednesday afternnon, but this dry time will be short lived as heights aloft slowly fall and a surface cold front approaches for late Thursday into Friday. This forcing will bring renewed threats for thunderstorms as the front pushes through Thursday into Friday. The good news about this round of convection is that mean layer wind fields will be slightly stronger, meaning storms should have quicker motions and thus less potential for training. The downside to this is wind shear will be a little higher than with this system (20-30 knots), thus we will have to watch for at least a low-end threat of severe weather late Thursday and into Friday along the front. Uncertainty remains fairly high this weekend and beyond as guidance is dispersive on the degree of upper-level troughing moving into the region, so for now will carry some chance pops through the weekend.

AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/

Issued at 1221 AM CDT Tue Jun 9 2026

MVFR ceilngs are clearing to the east as convection departs. A light wind should help keep visby up through the night but sporadic patchy ground fog will be possible in areas that experienced heavy rain today. Another round of slow moving convection is anticipated this afternoon although coverage may be somewhat limited. Have broad Prob30s for now but will try to narrow it down as the event approaches. Otherwise prevailing VFR conditions are anticiapted with moderate southwest winds.

PAH WATCHES/WARNINGS/ADVISORIES

IL...Flood Watch until 7 AM CDT this morning for ILZ075>078-080>094. Heat Advisory from 11 AM this morning to 8 PM CDT this evening for ILZ080-084-088-092-093. MO...Flood Watch until 7 AM CDT this morning for MOZ076. Heat Advisory from 11 AM this morning to 8 PM CDT this evening for MOZ076-086-087-100-107>112-114. IN...Flood Watch until 7 AM CDT /8 AM EDT/ this morning for INZ081- 082-085>088. KY...Flood Watch until 7 AM CDT this morning for KYZ002>022. Heat Advisory from 11 AM this morning to 8 PM CDT this evening for KYZ001>004.