Area Forecast Discussion
Issued by NWS Louisville, KY
Issued by NWS Louisville, KY
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879 FXUS63 KLMK 101901 AFDLMK Area Forecast Discussion National Weather Service Louisville KY 301 PM EDT Fri May 10 2024 .KEY MESSAGES... * Breezy Saturday with brief light rain possible in southern Indiana and northern portions of central Kentucky. * Lots of sunshine with moderate temperatures and light breezes on Sunday. * Active pattern next week with almost daily chances of showers and storms Monday through Friday. Severe weather is not expected through at least Thursday. Strong storm chances may increase slightly by Friday. && .SHORT TERM /THROUGH SATURDAY/... Issued at 301 PM EDT Fri May 10 2024 An upper level shortwave trough is dropping southeast over the Ohio Valley this afternoon, while a more potent upper level wave rotates southeast over the Upper Midwest in an active NW flow pattern. In between is very brief shortwave ridging, which will move over our region this afternoon and evening. A sfc cold front has pushed well south of the CWA. Winds are brisk out of the north, and lingering moisture in the lowest 5 kft is contributing to SCT-BKN low clouds. These clouds will continue to slowly thin and lift from north to south into the evening hours. This should provide just enough sfc heating to boost afternoon temps into the upper 60s to near 70 F. Tonight looks dry with light winds. Sfc winds turn southwesterly during the early morning hours ahead of the low pressure system currently over the Upper Midwest. This system rotates southeast over the Great Lakes and Upper Ohio Valley tonight and Saturday, dragging a cold front through central Kentucky and southern Indiana tomorrow. Deeper moisture and stronger forcing will be displaced to our northeast, so portions of the Upper Ohio Valley will see more rain out of this system. However, we will see a relatively narrow band of thicker clouds and scattered light rain pass southeast across southern Indiana and northern portions of central Kentucky through the morning and early afternoon hours. QPF is a few hundredths of an inch at most, especially from southeastern Indiana through northern KY and the Bluegrass. Other than that, widely scattered showers are expected to develop during the afternoon along the cold front. This will most likely be in the southern Bluegrass and Lake Cumberland regions. A brief shower could be accompanied by gusty winds to around 30 mph. But most will see a mainly dry and breezy day with winds gusting to 20- 30 mph. Winds will veer westerly and then northwesterly as the cold front passes through the region. Expect a period of sunshine in the wake of the front, with afternoon highs in the low to mid 70s. && .LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/... Issued at 301 PM EDT Fri May 10 2024 Chamber of Commerce weather is still expected for Sunday as weak high pressure crosses the southeastern United States. Other than possibly some valley fog in the Lake Cumberland region around dawn, we`ll have plenty of sunshine with temperatures warming from morning lows in the middle and upper 40s to afternoon highs in the middle and upper 70s paired with comfortably low humidity. A compact 5H shortwave/vort max and accompanying surface low over Kansas Monday morning will steadily push eastward and arrive in the Ohio and Tennessee Valleys by Tuesday evening. Precipitable water values will likely be above the climatological 75th percentile Monday afternoon through Tuesday night. However, instability and shear will be weak so just widespread showers and scattered sub- severe thunderstorms are expected. Mean QPF Monday evening through Tuesday evening is around half an inch, with the 90th percentile around an inch. Area rivers will be back in their banks by then (with the exception of some lingering minor flooding along the Green downstream from Woodbury), so renewed flooding is not expected at this time, though river level rates of fall may be slightly reduced. Wednesday through Thursday night weak ridging at the surface and aloft may bring us a mostly dry period. Then by Friday an upper trough will be approaching from the Plains with a surface low somewhere over the Midwest. This system should have better instability and shear to work with compared to the early week system, along with sufficient moisture for showers and thunderstorms. Upper support will be a little better as well, suggesting slightly better chances for stronger storms. Current rainfall amounts for the entire Monday through Friday period are in the 1 to 2 inch range, though with convective precipitation some areas will get more/less than others. High temperatures each day will generally be in the 70s. && .AVIATION /18Z TAFS THROUGH 00Z SUNDAY/... Issued at 141 PM EDT Fri May 10 2024 SCT-BKN ceilings will continue to lift above the MVFR threshold within the next hour or so at BWG and RGA. Sky cover will become SCT and eventually FEW this evening as drier air pushes in from the north. Quiet weather this evening with winds becoming light and variable after 00z. Winds turn back out of the southwest ahead of an approaching wave of low pressure. Expect a band of thicker mid-level clouds Saturday morning as an upper level trough and associated cold front approach from the northwest. Widely scattered light showers are expected within the band of thicker clouds as it passes southeast over the region Saturday morning into early afternoon. Additional isolated development is possible near RGA and south Saturday afternoon along the cold front. Winds will become gusty on Saturday as mixing deepens, with gusts to 20 kt likely. && .LMK WATCHES/WARNINGS/ADVISORIES... KY...None. IN...None. && $$ SHORT TERM...EBW LONG TERM...13 AVIATION...EBW