Area Forecast Discussion
Issued by NWS Jackson, KY
Issued by NWS Jackson, KY
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653 FXUS63 KJKL 150825 AFDJKL AREA FORECAST DISCUSSION National Weather Service Jackson KY 425 AM EDT Wed May 15 2024 .KEY MESSAGES... - Shower and thunderstorm chances will be around through this evening. After a lull on Thursday, the shower and thunderstorm chances return to close out the week. - Near normal to slightly above normal temperatures are expected through the work week following a bit of a cool down today owing to the showers around. && .SHORT TERM...(Today through Thursday) Issued at 425 AM EDT WED MAY 15 2024 08Z sfc analysis shows a broad area of stacked low pressure spinning over Kentucky and slowly working east. This has kept damp conditions around through the night with times of showers and fog beneath mostly cloudy skies and amid light southerly winds. Temperatures and dewpoints are similar throughout the forecast area - in this mild and moist environment - with readings in the upper 50s to lower 60s, most places. The models, and their individual ensemble suites, are in better agreement aloft through the short term portion of the forecast compared to 24 hours ago. They all depict an open 5h low easing east through Kentucky today along with a healthy amount of mid level energy. The cyclonic flow associated with this low also tracks off to the east later tonight with a weak area of ridging moving to over eastern Kentucky on Thursday - as 5h heights peak that afternoon. Thereafter, the pattern starts to flatten and more energy starts to work into the state well in advance of the next area of troughing inbound from the southern Plains. The model spread has shrunk with the latest runs on account of the ECMWF and NAM/GFS timing of the exiting trough being more similar. Accordingly, the NBM was used as the starting point for the short term grids along with the incorporation of the CAMs` details for PoPs and timing through tonight. Sensible weather features a damp and somewhat cool day with scattered to numerous showers and potential thunderstorms around into the evening. Some drying will take place tonight, but most likely this will only prompt the development of a thicker, and possibly widespread, blanket of fog for much of the late night hours. In addition, the higher moisture than normal will make for another mild night and near uniform temperatures. Thursday looks to be one of the drier days of the week but still a stray shower or storm will be possible late in the afternoon and during the evening - mainly in the east. Less showers around will make for a warmer day with near normal temperatures, as well. The main adjustments to the NBM starting point consisted of adjusting the NBM PoPs to include CAMs details for the shower and thunder chances through this evening. The temperatures and dewpoints from the NBM were not adjusted much considering the high levels of RH through the night time periods. .LONG TERM...(Thursday through Tuesday) Issued at 322 PM EDT TUE MAY 14 2024 The large scale upper level pattern in the extended will feature a trough exiting the mid-Atlantic region into the west central Atlantic Ocean, weak ridging in place over the Ohio and Tennessee Valleys extending southward into the central and northern Gulf of Mexico, and weak troughs moving through the central Great Plains and Four Corners regions to begin the period. We should start off mostly dry on Thursday, but may see a few showers and storms lingering across our eastern counties, on the backside of a departing trough. The ridge is expected to be weak, and will only influence our weather during the day on Thursday, before the troughs to our west move in and displace it. We should see another solid round of showers and storms affecting eastern Kentucky Thursday evening through Monday, as series of troughs move across the eastern half of the CONUS. The first trough will be the weakest of the bunch and will isolated to scattered showers and storms to the area Thursday night into Friday. A second much stronger system will move through the area Friday night through Saturday, and will bring widespread showers and storms to the area. A couple of other decent systems will work their way eastward across the area Saturday through Monday, and will bring more rounds of showers and storms to eastern Kentucky. All in all, the extended looks to be quite active. Temperatures will be generally above normal, with the warmest days seeing highs in the upper 70s to lower 80s. Nightly lows will only fall into the upper 50s and lower 60s. There are no weather concerns in the extended to speak of. Any thunderstorms we experience could produce locally heavy rainfall, gusty winds, and cloud to ground lighting, but there is no severe weather anticipated at this time. A combination of the GFS, GFE Ensembles, and ECMWF models were used to create the extended portion of the forecast this time around. && .AVIATION...(For the 06Z TAFS through 06Z Wednesday night) ISSUED AT 200 AM EDT WED MAY 15 2024 After a brief lull in the convection, another round of showers and potential thunderstorms will impact the area into dawn. Any breaks in, or thinning of, the cloud cover and precipitation will continue to produce fog through 13Z. Thus, expect a changeable mix of VFR, MVFR, and IFR conditions through the morning and possibly carrying into early afternoon, with MVFR conditions more likely to prevail between until around 18Z when VFR conditions should be able to hold outside of showers and storms. Winds will largely remain light through the period, through any stronger storm near TAF sites could produce a brief period of gusty and erratic winds. A more persistent northwest wind of 5 to 10 kts is expected to set in later in the afternoon. && .JKL WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SHORT TERM...GREIF LONG TERM...AR AVIATION...CMC/GREIF