textproduct: Paducah

KEY MESSAGES

- The hottest stretch of the season begins today 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.

- 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 with damaging winds and brief heavy rain as the main threats.

DISCUSSION

Issued at 158 AM CDT Tue Jun 9 2026

Today and Tonight...

The MCV responsible for the late evening uptick in convection has pushed east into central KY, and things have quieted down in the subsident wake of that feature. Expect a few showers to hang around, especially with a subtle uptick in low level jetting toward dawn, and a continued moist airmass. Will watch a bowing segment with a history of wind damage that is now entering western MO. This feature is expected to weaken before arriving, but will continue to monitor.

Otherwise, look for upper ridging to start building into the western CWA today as the shortwave trough axis lifts slowly off to the northeast. This will allow for a trend toward drier conditions, but will also bring increased heat and humidity with it. In fact, temperatures are expected to climb up around 90 degrees, with oppressive dew points in the mid and upper 70s through the afternoon. This will yield peak afternoon heat indices in the low to mid 100s along and west of a line from Fulton county KY to Perry county Illinois. East of this line, max heat index values are expected to be a bit lower and mainly in the upper 90s. No changes planned to the Heat Advisory for this afternoon as placement looks good along and west of the line mentioned above. Any scattered shower or storm activity could bring some relief to the afternoon heat and humidity, but coverage isn't expected to be widespread so still think the headline is warranted.

Despite the upper ridge building into the area, there will continue to be chances for scattered storm coverage today as HREF probs of > 2000 J/KG of ML CAPE range from 50 to 70 % across the CWA. Feel it is safe to say that moderate instability between 1500 to 2500 J/KG can be expected this afternoon, along with some modest 0-6 km flow between 20 and 25 knots at its peak. Pretty marginal for any prolonged organized updraft, but perhaps some brief multicell clusters could mix in with other pulse storm modes. Main threats with the stronger storms will be a localized wet microburst potential along with brief torrential rain. Some small hail may be possible, but given the moist column and freezing levels expected to be over 15K feet, large hail seems less likely. The locally heavy rainfall threat will likely continue given slow storm movement, PWATs around 2" through the column, and the high freezing levels promoting efficient rainfall processes. The SPC Marginal Risk for a strong to severe storm or two looks reasonable given the amount of instability and potential for some water loaded wet microbursts. In addition, the WPC Slight Risk for Excessive Rainfall also looks good given the factors promoting heavy rainfall potential mentioned above. Coverage of any flood issues should be isolated, but decided to extend the Flood Watch through today. It now expires 7 PM CDT.

Tonight looks mostly dry as the upper ridge gets more established over the area, and the lack of a notable trigger keeps convective chances in check. May still have to watch for any remnant MCV's coming from upstream convection that could act as a trigger, but right now CAMs keep things pretty quiet. Overnight lows are only expected to drop into the mid 70s.

Wednesday - Thursday...

Upper ridging will be in place over the area to start Wednesday, however it will start to lose influence as zonal mid level flow starts to sag into the region thanks to a north central CONUS shortwave trough. Still, expecting the ridge to hold on enough to keep things dry, hot, and muggy through mid week. Looking for afternoon highs mostly in the low 90s Wednesday and Thursday, and this combined with dew points in the mid 70s should once again yield pretty uncomfortable heat indices. Looking for max values in the low 100s for most areas each day, and will be pushing Heat Advisory criteria again each of these days. Something to watch as more headlines may be needed for this time period.

Thursday Night - Friday...

By Thursday night into Friday, shower and storm chances are expected to return. A shortwave will eject out of the central Plains into the upper Midwest, along with its associated strengthening surface low. This will drag a trailing cold front into our region with what appears to be pretty solid coverage of showers and storms ahead of it later Thursday night into Friday morning. The best deep layer shear will be positioned just to the north of our CWA, and given the timing of arrival around the diurnal minimum, do expect some weakening of whatever organized storms are coming from upstream. Still some modest to moderate ML CAPE should still be lingering, and if there is a good cold pool push from upstream some strong to severe potential might exist across the area. Main threat would be wind in this scenario. The good news is this should bring some relief from the heat and humidity as Friday highs will be back in the mid 80s for most, and dew points should drop off back into the 60s behind the front.

Friday Night - Monday...

Fairly high confidence in a dry stretch of weather to start the weekend Friday night into Saturday as surface high pressure gains enough influence into the region behind the cold front. Temperatures should be around normal for this time in the mid and upper 80s. Confidence lowers for Saturday night through Monday as progressive zonal flow could allow for several disturbances to move through the region, sparking shower and storm chances.

AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/

Issued at 616 AM CDT Tue Jun 9 2026

Conditions remain unsettled today and scattered to numerous showers and thunderstorms can be expected through at least early afternoon. Brief IFR visilbity in thunderstorms can be expected amid mostly prevailing VFR conditions.

More settled VFR conditions are forecast overnight.

PAH WATCHES/WARNINGS/ADVISORIES

IL...Flood Watch until 7 PM CDT this morning for ILZ075>078-080>083- 085>087-089>091. Heat Advisory west of I-57. MO...Heat Advisory All zones. IN...Flood Watch until 7 PM CDT /8 AM EDT/ this morning for INZ081- 082-085>088. KY...Flood Watch until 7 PM CDT this morning for KYZ007>022. Heat advisory for river counties.