Forecast Discussions mentioning any of "ACARS" "MDCRS" "AIRCRAFT" "TAMDAR" "AMDAR" "WVSS" received at GSD on 05/28/19

Area Forecast Discussion
National Weather Service Louisville KY
848 PM EDT Mon May 27 2019 .Forecast Update... Issued at 845 PM EDT Mon May 27 2019 Fortunately much quieter weather in our neck of the woods this evening. A cap was able to develop this afternoon, based on AMDAR soundings and the lack of deep convection in our area. Farther north in central Indiana, on the leading edge of those stronger low-level winds and ahead of that cap, we have several quickly rotating thunderstorms. Have removed any additional storm chances from the evening forecast in an update out shortly. && .Short Term...(This evening through Tuesday) Issued at 300 PM EDT Mon May 27 2019 The warm front is exiting our northern CWA at this hour and will continue to push northward toward the lower Great Lakes region by tonight. As a result, steady SSW winds have taken hold and temps have risen to the low to mid 80s north and upper 80s south. We have become moderately unstable in the warm and muggy warm sector this afternoon beneath fairly steep mid level lapse rates, and the big question is whether we can develop any additional showers/storms. One factor that would favor isolated development of a few showers/storms would be a steady increase in low level jetting associated with the system over the upper Midwest. Enough isentropic lift may occur to kick off some convection so will continue to leave mention of isolated chances this afternoon/evening. One factor that could inhibit initial development is a subtle inversion evident on forecast soundings between H85-H7. This feature is expected to increase in magnitude later this afternoon/evening so it appears our window to develop convection will shorten with every hour. If a few showers and storms are able to develop, then there would be a chance for a few strong "pulse type" storms. Main threats would be lightning, brief heavy rain, gusty winds, and perhaps some small hail. Otherwise, expect a mostly clear and mild overnight with lows in the upper 60s and low 70s. This will be thanks to a steady SSW wind mostly between 5 and 10 mph. The H85-H7 inversion appears to strengthen on Tuesday as the upper ridge centered to our SE takes a little better hold of the area. As a result, we should stay dry. With mostly sunny skies and a steady SW wind/warm advection component we should be able to warm into the upper 80s and low 90s for highs. .Long Term...(Tuesday night through Monday) Issued at 315 PM EDT Mon May 27 2019 Tuesday Night - Thursday... Tues night the upper level ridge over the region will weaken allowing a sfc boundary to drop south into our region. This will allow several shortwaves to pass through the Ohio Valley producing isld-sct showers/storms late Tues night through Wednesday. Models indicate a good amount of instability (2000-2500 k/jg CAPE) will build ahead of storms Wed afternoon/evening. This combined with reasonable wind profiles may be enough to produce strong to isolated severe storms. The best focus for storms will be over southern Indiana/northern KY closer to the weak boundary and best moisture plume. On Thursday, expect the main cold front and sfc low pressure to push NE through the Ohio Valley with a weakening upper trough lagging behind. This will result in more chances for sct showers/storms. Wind profiles will be stronger and more favorable for organized convection, however, instability will be in question depending on evolution of previous convective complexes Wed night/early Thu morning. At this point, strong storms do look possible on Thu. Temperatures will continue to be quite warm ahead of the cold front with highs ranging through the 80s to around 90 on Wed and Wed night lows in the upper 60s. Thu high temps will range from the low to mid 80s as forecast but could be warmer depending on sky cover/precip early in the day. Both Wed/Thu look to be breezy outside of any convective activity. Friday - Saturday... As the aforementioned upper trough slowly moves through the area on Fri, isld-sct showers/storms will again be possible. Wind fields/instability will be considerably less on Fri so not expecting any organized svr wx threat. Friday night through Sat night looks to be the driest period in the long term with a break in the shortwave activity. Temps should be in the upper 70s/lower 80s for highs. Sunday - Monday... Long range models differ on how quickly an upper ridge will build back into the Ohio Valley from the west. The 12Z GFS/GFS Ensembles suggest we could get caught in a train of MCS activity in NW flow for the beginning of next week. However, the 12Z Euro indicates a quick cold front passage on Sun with the upper ridge quickly building east toward the Ohio Valley Mon/Tue. && .Aviation...(00Z TAF Issuance) Updated at 650 PM EDT Mon May 27 2019 Expect steady SW winds mostly around 10 mph through tonight. By Tuesday, slightly stronger SW winds will take hold along with a few gusts in the 20-25 mph range. The only notable cloud cover will be few-sct Cu around 3-5 k feet and some upper sky cover at times. && .LMK WATCHES/WARNINGS/ADVISORIES... IN...None. KY...None. && $$ Update...RJS Short Term...BJS Long Term...AMS Aviation...RJS