856 FXUS63 KLMK 160230 AFDLMK Area Forecast Discussion National Weather Service Louisville KY 1030 PM EDT Tue Jul 15 2025 .KEY MESSAGES... * Very warm and humid conditions are expected this week with scattered afternoon/evening thunderstorms. Torrential rainfall, gusty winds, and lightning will be the main threats with this activity. && .UPDATE... Issued at 1030 PM EDT Tue Jul 15 2025 Isolated showers and storms continue this evening as we are located under a 700mb jet combined with an elongated vort wing associated with the mid-level shortwave. It remains warm and humid at this time, with temps in the upper 70s and lower 80s still, and dewpoints in the 70s. This airmass will remain in place, with lows tonight staying in the 70s. A decaying cluster of storms over western KY are expected to push into central KY later tonight, but waning instability and little shear will help continue to erode these storms. Convective redevelopment, possibly along remnant outflows, will be possible after 06z tonight. While some rumbles of thunder will be possible, any storms should be elevated. Heavy rain remains the main concern tonight, with PWATs exceeding 2.0 inches, and storm motions not very progressive. Localized flooding issues may arise in any areas that receive additional rainfall. In western KY, SPC Mesoanalysis notes a pocket of 2.3" PWATs, so there is plenty of moisture available for storms to feed off of. Overall forecast remains in good shape, so no major changes are planned at this time. && .SHORT TERM /THROUGH WEDNESDAY/... Issued at 318 PM EDT Tue Jul 15 2025 Remnant MCV is working over the Ohio Valley this afternoon and as it interacts with the moist unstable environment we will see bands and clusters of showers/thunderstorms that produce torrential rainfall. PWAT values are around 2.00", SBCAPE 2500-3000 J/kg with a storm motion of 15-20 mph this afternoon with no shear and poor mid-level lapse rates rates, the main impacts remain the heavy rainfall that could lead to very localized flooding and even ponding on area roadways this afternoon into the early evening. Storms will have frequent lightning and could get some gusty winds. Some lingering convection towards eastern and southern KY is possible as we go into the evening but overall we may see a brief lull in activity before a a weak mid-level wave over the Ozarks this afternoon works across the area along the Ohio River and southern IN later tonight into tomorrow morning. Could see some enhanced lifting thanks to a 30kt LLJ and it looks to arrive late tonight and through the early morning hours with additional rain and thunderstorms with more heavy rainfall, as PWAT values remain around 2 inches, frequent lightning and a localized flooding concern as these showers/storms could work over the same places that saw the heavy rain this afternoon. Mid-level wave works eastward during the morning hours of tomorrow with lingering showers/storms across our far eastern CWA at the start of the day. It will be generally more of the same with the muggy and very warm air in place but with continued weak ridging over the area tomorrow we may see more isolated than scattered convection in the afternoon and evening with highs in the upper 80s/low 90s and dewpoints in the low/mid 70s. && .LONG TERM /WEDNESDAY NIGHT THROUGH TUESDAY/... Issued at 318 PM EDT Tue Jul 15 2025 Shortwave trough ejecting out of the Pacific Northwest today will meet up with a developing sfc low across the Plains tomorrow and work across the Great Lakes Wednesday night into Thursday flattening out the ridge over the Ohio Valley and southeast US. An associated cold front will drop southeast out of Upper Midwest Thursday into Thursday night before stall along to just north of the Ohio River for the end of the week into the start of the weekend. We will remain in the very warm and juicy airmass with mainly diurnally driven convection each day as highs will be in the upper 80s/low 90s nearly every day with the exception of Thursday where highs could be in the low/mid 90s. As has been the trend the last several days, while we have convective chances each and every day, we continue to lack shear which keeps the overall severe threat low. Frequent lightning, gusty winds and heavy rainfall will continue to be the main impacts from any showers/storms that form over the next several days. Localized flooding with repetitive rounds of showers/storms will be the biggest overall impact. && .AVIATION /00Z TAFS THROUGH 06Z THURSDAY/... Issued at 738 PM EDT Tue Jul 15 2025 VFR conditions are across the area, though isolated to scattered showers and storms will continue this evening. A bkn line of storms is approaching HNB, which will likely impact the airfield within the next hour. Otherwise, additional chances will come overnight as a decaying convective complex moves across western KY. Highlighted potential for -SHRA or -TSRA in PROB30 groups. Any heavy precip will cause brief impacts to vis and cigs, but otherwise VFR conditions are mostly expected through tomorrow. && .LMK WATCHES/WARNINGS/ADVISORIES... KY...None. IN...None. && $$ UPDATE...CJP SHORT TERM...BTN LONG TERM...BTN AVIATION...CJP