


Area Forecast Discussion
Issued by NWS Louisville, KY
Issued by NWS Louisville, KY
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849 FXUS63 KLMK 071454 AFDLMK Area Forecast Discussion National Weather Service Louisville KY 1054 AM EDT Mon Jul 7 2025 .KEY MESSAGES... * Scattered thunderstorms could produce locally gusty winds and brief torrential rainfall this afternoon and evening. * Warm and humid all week, with scattered showers and thunderstorms expected each day. Organized severe weather is not expected. && .UPDATE... Issued at 1054 AM EDT Mon Jul 7 2025 Mostly sunny conditions this morning across the central and eastern KY, but a bit more cloud cover is noted over IN and western KY where a "cold" front is located. Temps have warmed into the mid-80s already, and with muggy dewpoints across the region in the lower 70s. As the front approaches the forecast area, expect diurnal storms this afternoon. With high PWATs in place, heavy rain and wet microbursts are the main hazard for today. SPC has introduced a Marginal risk for severe wind gusts, though our confidence in any storms producing severe winds remains low. Our environment will feature high CAPE, but low shear and slow storm motions. Overall, the forecast remains in good shape, with only some minor trimming to PoPs at this hour based on GOES and radar observations. && .SHORT TERM /THROUGH TONIGHT/... Issued at 327 AM EDT Mon Jul 7 2025 A weak low pressure system is centered over southern Ontario, with a trailing cold front cutting through Southeast Lower MI, central IL, and west into KS. A pool of PW near 2 inches is noted along the boundary through northwest OH, IN, IL, and MO. Light SW low-level flow continues to gradually advect moisture into the region. The humidity has returned, with sfc dewpoints now in the low 70s across the forecast area. Today, the weak cold front to the northwest will slowly sink into southern portions of IL/IN. The plume of deep moisture associated with the boundary will spill into southern IN and central KY this afternoon and evening. The approaching sfc boundary, as well as weak mid-level shortwave energy, will provide sufficient lift for scattered showers and thunderstorms. Moderate to strong destabilization of the humid airmass will allow for a few strong updrafts, though weak shear will limit organization. Pulse storm hazards will be in play, including brief torrential downpours, locally gusty winds, and lightning. In general, highs today will likely be at least a couple of degrees lower across the board. However, afternoon storms and cloud cover introduce a bit more uncertainty into the temperature forecast. Expect highs to range from the mid 80s to around 90. Showers and storms will diminish in coverage after sunset, with isolated activity possible overnight. Lows Tuesday morning will be in the upper 60s to low 70s. && .LONG TERM /TUESDAY THROUGH SUNDAY/... Issued at 327 AM EDT Mon Jul 7 2025 Weak upper level troughing lingers over the region Tuesday through Friday, downstream of strong upper ridging over the Southwest. With no significant frontal passages, a very warm, humid airmass will remain in place. Scattered showers and thunderstorms are likely each day, with activity blossoming in coverage during the afternoon and evening hours. Convection develops in a weakly forced, unstable environment with weak shear. Deep layer shear may briefly increase to 25 kts or so on Wednesday with a mid-level wave moving over the region, which could support loosely organized multicells. However, for the most part, thunderstorms will be diurnally-driven and unorganized. The main concerns will be localized strong wind gusts, heavy rainfall, and lightning. This weekend, upper level ridging amplifies across the southern CONUS. We should see rising heights aloft from the south. However, a stronger Canadian low pressure system then drags a cold front toward the region, keeping relatively high rain chances in the forecast. Temperatures this week will run near or slightly above normal. Highs in the mid 80s to around 90 will be common, with lows in the upper 60s to low 70s. && .AVIATION /12Z TAFS THROUGH 18Z TUESDAY/... Issued at 653 AM EDT Mon Jul 7 2025 VFR conditions expected this morning to begin the period with mostly clear skies initially. However, low and high level clouds will increase this afternoon as deeper moisture overspreads the region ahead of a weak cold front. Scattered PM SHRA/TSRA expected in a moist, unstable environment south of the weak boundary. Any heavier or storm could produce brief IFR vsby and gusty winds. Due to spotty nature of convection today, decided to stick with the PROB30 mention during the most favorable hours. Winds will weaken quite a bit after sunset tonight as the boundary stalls near southern IN. Fog and low clouds will be possible across southern IN and northern KY early Tuesday. && .LMK WATCHES/WARNINGS/ADVISORIES... KY...None. IN...None. && $$ UPDATE...CJP SHORT TERM...EBW LONG TERM...EBW AVIATION...EBW