Area Forecast Discussion
Issued by NWS Louisville, KY
Issued by NWS Louisville, KY
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511 FXUS63 KLMK 011844 AFDLMK Area Forecast Discussion National Weather Service Louisville KY Issued by National Weather Service Indianapolis IN 244 PM EDT Tue Oct 1 2024 .KEY MESSAGES... * Isolated shower possible this evening east. * Otherwise, Partly cloudy west; Mostly Cloudy East * Becoming Mostly Sunny on Wednesday * Mostly Dry weather with seasonable to above temperatures late week and this weekend but cooler next week && .SHORT TERM /THROUGH WEDNESDAY NIGHT/... Issued at 242 PM EDT Tue Oct 1 2024 Synopsis: Surface analysis early this afternoon shows a diffuse cold front east of our area, over the Appalachians. Strong high pressure was centered over NB/KS, and was building southeastward into the Ohio Valley. GOES16 shows lingering cloud cover in the wake of the cold front across Central KY, with lower clouds found across the Bluegrass. Northwest surface winds were in place and dew points were mainly in the 60s. The flow aloft showed a trough over the Great Lakes, while ridging was found stretching from California to the lower Mississippi Valley. This was resulting in Pacific northwest flow streaming across the northern plains and then into the Ohio Valley. Water Vapor imagery showed subsidence across Central KY. This evening - As some clearing has developed across the western parts of Central KY, convective temperatures have been reached allowing some CU development. The HRRR has responded with some isolated light rain showers shown to develop late this afternoon and early this evening. Coverage should be limited and light for any location that does see rainfall. For now will stick with mainly 20% pops through 00Z across the northeast half of the forecast area. Overnight - As heating is lost, any lingering showers will quickly dissipate. Models show steady southeastward progress of the surface high as the northwest flow aloft continues. Little in the way of forcing dynamics is seen as the surface high arrives tonight. Forecast soundings continue to show strong mid level drying with a trapping inversion present within the lower levels. This will likely result in some of the pesky clouds lingering over eastern Central KY to persist through the overnight hours. More clearing will be expected in western Central KY and Southern Indiana as drier air and lower dew points will be arriving there first. Thus mostly cloudy skies east, with clearing skies across the west is expected. Coolest lows in the upper 40s will be found in south central Indiana, while much of KY has lows in the low to mid 50s. Wednesday - Strong surface high pressure to the northwest will build eastward on Wednesday. The high will reach southern IL and western KY in the afternoon, allowing continued cool, northerly surface flow across Central KY. Forecast soundings through the day show a dry column with a mid level inversion that should prevent much in the way of cloud development. Any morning clouds found across the Bluegrass are expected to dissipate by late morning as heating and mixing resumes along with the arrival of drier air. Thus we will look for skies to become partly cloudy/mostly sunny with pleasant high temperatures in the low to middle 70s. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... Issued at 242 PM EDT Tue Oct 1 2024 A pair of cold fronts, steered by Great Lakes waves, could bring a few showers to the area around Friday and again around Sunday and Sunday night. Although, moisture will be the main issue opposing showers, as model soundings are showing a mostly dry column through early next week. Otherwise, good confidence that surface high pressure, zonal flow and a mostly dry column should bring dry weather along with seasonable to slightly above normal temperatures with highs mostly in the upper 70s to lower 80s. Friday and Sunday look like the warmest days of the period with middle 80s possible during the afternoon, just ahead of the advancing fronts. Cooler weather should arrive next week, in the wake of the second cold front, as winds turn to the northwest and north, resulting in modest cold advection. Many locales may not see temperatures as warm as 70 degrees starting Monday. && .AVIATION /12Z TAFS THROUGH 18Z WEDNESDAY/... Issued at 1233 PM EDT Tue Oct 1 2024 Impacts: - MVFR Cigs at LEX and RGA this afternoon and tonight. - VFR Cigs elsewhere Discussion: Stratus and low cloud in the wake of a cold front were still lingering across Eastern Central KY. GOES16 shows MVFR Cloud cover at LEX and RGA, as well as points upstream across northern KY. Forecast soundings show an increase in height with these clouds this afternoon, but moisture lingers through the evening and overnight as cold air advection continues. Meanwhile at SDF, HBN and BWG, MVFR CIGS have already exited the area. Continued northwest flow and ongoing cold air advection will allow for BKN VFR Cigs through the afternoon before leading to clearing overnight. Clear skies and diminishing winds will take hold on Wednesday morning across all the of Taf sites. && .LMK WATCHES/WARNINGS/ADVISORIES... KY...None. IN...None. && $$ SHORT TERM...JP LONG TERM...MK AVIATION...JP