textproduct: Paducah

KEY MESSAGES

- The hottest stretch of the season continues with high temperatures over 90 degrees today and tomorrow. 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.

- Another round of showers and storms arrives again on Thursday night and Friday ahead of a cold front. Some of the storms could be strong to severe with damaging winds and brief heavy rain as the main threats.

- The soup returns by Saturday with persistent rain and thunderstorm chances returning through Monday or Tuesday. Areas of heavy rainfall/flooding appear possible in the advertised pattern.

DISCUSSION

Issued at 1227 AM CDT Wed Jun 10 2026

The upper level low that has been keeping rainy and storm conditions in place has departed to the east. 500mb heights are around 590 dm. Broad troughing over the western US is eating away at those heights a little and slightly drier air is moving into the 700-850mb range per observed 00z soundings. Surface dewpoints are still in the low to mid 70s however. It is going to be hot and humid, heat index values 100 to 105 degrees are anticipated and if there is even a little overachievement we will exceed heat advisory criteria. It does look like however deep vertical mixing should mix our dewpoints down enough to stay below 105, but it will be close. Conditions appear fairly similar on Thursday. Cloud cover looks like it could be a little more of a factor in the afternoon as a storm system approaches from the northwest. In the larger collab picture we are a little short of heat advisory criteria although the impacts may still be notable so will continue messaging and impromptu advisories may still be needed depending on obs trends.

A shortwave trough advances towards the region Thursday night with a cold front moving along with it. The upper level forcing is pretty neutral til the front arrives but there does appear to be a window of overlap of some favorable shear/instability to support a severe weather threat in the late overnight moving in from the northwest. Instability does appear to be waning as any convection approaches though given the location of jet-level ascent and diurnal cooling.

After a brief humidity respite behind this front the soup comes back by Saturday night. A ripply zonal subtropical/polar jet phase sits to our north with a few weak shortwaves stirring things up. Blending the GFS/ECMWF overall solution shower and storm chances look to spark up and persist again through Monday night or Tuesday. The solutions for now point towards deep rich moisture and modest instability supportive of a heavy rain pattern riding along south of an west to east front. As the event nears it is probably reasonable to expect window for flash flooding (and possibly isolated severe) during that period.

AVIATION /18Z TAFS THROUGH 18Z THURSDAY/

Issued at 1145 AM CDT Wed Jun 10 2026

A VFR forecast thru the period. Diurnal CU field is expanding this afternoon with bases between 4-5kft forecast. SW winds 9-12 kts continue thru the afternoon with gusts up to 20 kts possible. Winds remain elevated to around 10 kts through much of the night relaxing to around 4-5 kts after 6-8z. Winds pick up again on Thursday from the southwest.

PAH WATCHES/WARNINGS/ADVISORIES

IL...None. MO...None. IN...None. KY...None.