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Area Forecast Discussion
Issued by NWS Jackson, KY
Issued by NWS Jackson, KY
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454 FXUS63 KJKL 040953 AFDJKL AREA FORECAST DISCUSSION National Weather Service Jackson KY 553 AM EDT Thu Jul 4 2024 .KEY MESSAGES... - Sultry weather continues through Friday. Afternoon heat indices may reach near 100 in some locations. There is also a persistent threat of thunderstorms through Friday, especially during daytime hours. A few thunderstorms could produce locally heavy rainfall and strong wind gusts. - A cold front finally pushes through as we move into the weekend, with dry and somewhat cooler and less humid weather arriving. - Warmer and more humid conditions will make a noticeable comeback on Monday and continue into the week, along with a potential for more thunderstorms. && .SHORT TERM...(Today through Friday) Issued at 546 AM EDT THU JUL 4 2024 A weakening, stalled frontal boundary is laid out north of the Ohio River early this morning. Its exact position is a bit muddled due to weak surface winds and prior convection. In the upper levels, we reside along the southern edge of the prevailing westerlies, with a weakening high over the Deep South and multiple waves propagating through the westerlies to our our north. Aside from a stronger wave over the northern plains, the features aloft are very weak and difficult for the models to handle. However, our atmosphere is warm/moist and easily destabilized with lifting and/or diurnal heating. That being the case, will look for more convection to develop along and south of the frontal boundary today, but exactly how it plays out is uncertain. Mesoscale features will play a significant role. Using a blended solution from models, will expect convection to pick up as we move into the day, with the greatest coverage over our northern and eastern counties today. The activity should again diminish to some extent as we move into the night. The aforementioned upper level wave over the northern plains will strengthen as it moves east and will lead to a larger scale trough developing over the Midwest by Friday. This will support a strengthening surface low tracking east over the Great Lakes on Friday, which will propel a cold front east southeast into Kentucky. The front will work in combination with the deepening upper level trough and strengthening flow aloft to bring a likelihood of showers and thunderstorms area wide on Friday. Precipitable water should remain near or above two inches through the short term period, which will allow thunderstorms to be efficient rain producers. Should any training of cells occur, there remains a possibility of localized hydro problems. Pockets of higher instability could lead to some strong storms in the afternoon or evening hours. Flow aloft will also be increasing during the short term period, which would be more supportive of some organization and a severe threat. Even so, it does not look overly impressive. .LONG TERM...(Friday night through Wednesday) Issued at 349 AM EDT THU JUL 4 2024 The forecast period begins with the CWA in the midst of FROPA as a cold front is slowly moving through the area. A surface low moving through the Great Lakes will drag the front through the area with showers and thunderstorms occurring at the start of the period. The front will gradually exit the region Saturday afternoon with high pressure building in and remaining overhead for Sunday into Monday. Models continue to hint at the continuation of an active pattern into next week. However, in this evening/overnight model suite, long- term deterministic models begin to diverge on how upper-level forcing will play out for next week. The GFS continues with a dry streak into Tuesday morning before dragging a cold front through the Commonwealth late Tuesday evening. The ECMWF is a little more active with PoP chances building in for Monday night before a surface low moves through the Great Lakes and drags a surface boundary through the area Tuesday afternoon. However, both models keep PoP chances overhead through the remainder of the forecast period. Nonetheless, with the discrepancies between deterministic runs, opted to stick with a weighted NBM solution that keeps periods of showers and storms through the remainder of the forecast period. Overall, the period will highlighted with periods of showers and thunderstorms that`ll bring much needed rain to the area. Also, temperatures will return to more seasonal ranges as daytime highs in the mid-80s to low-90s and overnight lows ranging from the upper-50s to upper-60s. && .AVIATION...(For the 06Z TAFS through 06Z Thursday night) ISSUED AT 229 AM EDT THU JUL 4 2024 A few showers/thunderstorms were affecting the far northern portion of the forecast area around KSYM at the start of the period, while others in central KY were heading eastward. Although new cells occasionally pop up, the activity continues on an overall decline and is unlikely to affect TAF sites. Outside of the precip or some spotty valley fog in far southeast KY, VFR conditions are expected into the day. Showers/thunderstorms are forecast to develop during the late morning and last through the afternoon. They will not be continuous at any given location, and it would be very difficult to pin down timing. That being the case, VCTS was used in TAFs with the realization that it is likely that at some point in time there will be precipitation with sub-VFR conditions. Precipitation is expected to diminish late in the day into the evening, leaving mainly VFR conditions. && .JKL WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SHORT TERM...HAL LONG TERM...VORST AVIATION...HAL