Area Forecast Discussion
Issued by NWS Jackson, KY

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323 FXUS63 KJKL 241854 AFDJKL AREA FORECAST DISCUSSION National Weather Service Jackson KY 254 PM EDT Mon Jun 24 2024 .KEY MESSAGES...
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- Heat and humidity return for Tuesday and Wednesday. - Next best chance of rain will be Wednesday into Wednesday evening. - Hotter weather is expected to make a comeback by Friday and Saturday, with afternoon highs in the low to mid 90s and heat index values around 100 degrees.
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&& .SHORT TERM...
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(This evening through Tuesday night) Issued at 254 PM EDT MON JUN 24 2024 The surface high in place today will push east tonight and mid-level ridging will build poleward some tonight. This will aid in paving the way for clear skies and calm conditions to the area tonight. Given this is expect reasonable ridge/valley splits of up to 10 degrees are expected tonight. There will also be mainly river valley fog setting up later tonight into Tuesday morning. Tuesday, the mid-level ridge will peak across the Ohio Valley. There will be some high clouds from upstream system that the HREF is showing and therefore will undercut the NBM operational forecast afternoon highs slightly, which seemed overdone. Even so, we will see upper 80s to lower 90s by Tuesday afternoon. Right now, the NBM keeps it dry for Tuesday and with ridging this seems reasonable. However, some CAMs show a small chance (less than 15 percent) of activity from overnight convection making it into parts of Kentucky. This will have to be watched as this will be more a mesoscale feature which are difficult for models to latch onto at this point. Tuesday night, more clouds will push southward as the ridge breaks down and trough pulls east. The guidance is showing a fair amount of uncertainty on when and where we will see rain on Tuesday night given again the more mesoscale nature of this activity. For now, keeping close to the NBM, with areas generally north of the Mountain Parkway seeing around a 15 to 30 percent chance of rain and thunderstorms mainly in the early morning hours Wednesday. .LONG TERM...(Wednesday through Monday) Issued at 235 PM EDT MON JUN 24 2024 A rather active long-term forecast period is expected as there`s going to be a shift in overall synoptic pattern. The first of a handful of disturbances is expected to bring a cold front into the region Wednesday afternoon through Wednesday evening. A couple small perturbations revolving around a parent trough will favor surface low development over the Great Lakes with a cold front extending southwest through the Commonwealth. The SPC has given eastern Kentucky a marginal risk of severe weather with this boundary as FROPA is expected mid-day to maximize the potential for instability building. Forecast soundings have decent severe weather indices in place across the area. Decently steep low and mid level lapse rates are in place, instability around 2,500 J/kg in the afternoon is favorable, PW`s around 2.00" which if materialized could bring some heavy rainfall but overall the most lacking parameter is the lack of bulk shear across the region. Low shear values could limit the overall strength of the storms but not really minimize the potential for thunderstorms. Also, the potential for increased cloud cover could limit the ability to increase instability which alone could limit the coverage of the thunderstorms. Thunderstorms will taper off from northwest to southeast through the overnight Wednesday but an H850 shortwave is forecast to develop with a surface feature riding along the departing cold front. The surface low will keep shower and thunderstorm chances across the far eastern third of the CWA through the day Thursday before the whole trough ejects to the northeast. Behind the exiting trough, height rises are forecast for Friday morning. At the surface, high pressure will establish itself and persist through the day Friday and half of Saturday before another upper-level wave dives southeast out of western Canada and approaches the Great Lakes dragging a cold front through the Commonwealth from Saturday night through Sunday with another perturbation providing a renewing shot of showers and thunderstorms Sunday into Monday. High pressure will build back into the region for the end of the period. Overall, the entire period will be highlighted by multiple rounds of showers and thunderstorms with high temperatures remaining in the mid-80s to low-90s and overnight lows in the upper-60s to mid-70s.
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&& .AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon) ISSUED AT 120 PM EDT MON JUN 24 2024 High pressure at the surface will keep the period mostly VFR. There is a cumulus field that is set up across the area leading to cloud bases around 3 to 4 kft. Outside this we could see a little mist or fog tonight in the valleys mainly, but this could develop at SME/LOZ later tonight in the MVFR range. However, this will lift around 12z to 13Z Tuesday and VFR conditions will be the story for the remainder of the period. The winds will be out of the north and west through the afternoon generally 5 knots or less and will become calm this evening. && .JKL WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SHORT TERM...DJ LONG TERM...VORST AVIATION...DJ