Area Forecast Discussion
Issued by NWS Louisville, KY
Issued by NWS Louisville, KY
Versions:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
734 FXUS63 KLMK 150005 AFDLMK Area Forecast Discussion National Weather Service Louisville KY 805 PM EDT Sat Sep 14 2024 .KEY MESSAGES... * Widespread showers around Bowling Green tapering off by midnight. * Chances for rain (<40%) possible around midweek; otherwise, mostly dry and warm through next weekend. && .UPDATE... Issued at 804 PM EDT Sat Sep 14 2024 Quick update to increase PoPs southwest through southeast of Bowling Green as showers, and a couple rumbles of thunder, move up out of middle Tennessee. IR satellite shows warming tops and radar indicates that the convection is increasingly poorly organized and outflow dominated as the sun sets. HRRR agrees with this trend, and still has convection dissipating by midnight. && .SHORT TERM /THROUGH SUNDAY/... Issued at 311 PM EDT Sat Sep 14 2024 Temperatures across the region have warmed well into the 80s this afternoon, and the cu field has developed due to the sfc heating taking place. Much more cloud cover is located just to our south, with an axis of thick and agitated cloud cover stretching from Georgia to far western Kentucky. This area is under more influence from the remnants of Francine, with large scale forcing and a corridor of 850mb jetting providing an increase in moisture transport and convergence. Most of our region will remain dry for the rest of the day, but some isolated to scattered showers and storms are possible this afternoon and into the evening hours for south-central Kentucky. The main corridor for convection will be within the moisture transport axis, which follows the 850mb core from northern Georgia/Alabama, through middle Tennessee, and into far western Kentucky. A few cells are already popping on the northern periphery of this corridor. Steep low level lapse rates, along with some marginal instability, will allow for some thunderstorms across the south for the next few hours. However, wind profiles are very weak this far north, so shear will be nearly nonexistent. Severe storms are not expected, but some heavier rain rates may be possible given PWATs over 1.5 inches. Precip activity will diminish as we get later into the evening hours, and should have dry conditions after midnight across the entire region. Rex Block pattern for tomorrow will help push the tropical remnants more southward, which will keep us dry again. Temperatures will warm into the 80s again, and perhaps some spots closer to 90. Some guidance suggests a low chance of an isolated shower again tomorrow afternoon southwest of Bowling Green, but not too confident in this. Will limit PoP to 20% for a few hours tomorrow afternoon for areas west of I-165, but otherwise dry conditions and mostly sunny for the rest of the area. && .LONG TERM /SUNDAY NIGHT THROUGH SATURDAY/... Issued at 311 PM EDT Sat Sep 14 2024 Much of next week will feature an unusual upper level pattern for our region as broad upper ridging over the northeastern U.S. interacts with a decayed tropical system (Francine) and one that may develop early next week near the Carolina coastline in a weakly sheared environment. The remnants of Francine will likely be confined to our south as upper ridging in the northeast and weak steering flows keep it from wobbling into the Ohio Valley, so no rainfall is anticipated from that early next week. What could briefly impact us is a potential tropical system that may develop near the Carolinas and swing into eastern Kentucky as early as Tuesday. There is still quite a bit of uncertainty in the path and development of this system, though at this time it appears the majority of precipitation associated with this system will be well off to our east. Both NBM and a composite of ECMWF/GFS/CMC ensembles highlight chances for measurable rainfall (greater or equal than 0.01") around 30-40% near the I-75 corridor in our eastern CWA, with lesser chances as you progress westward. Outside of the potential glancing blow from this system, the forecast looks quiet and dry in the weak upper level flow pattern. Temps will be on the warm side of climo given the higher thicknesses/heights due to the proximity of the broad upper ridge. The coolest temps are expected mid-week due to mid/upper level clouds from the potential tropical system limiting solar insolation. A western CONUS trough will attempt to slide eastward through much of this week, but may only make it as far as the central U.S. by next weekend. && .AVIATION /18Z TAFS THROUGH 00Z TUESDAY/... Issued at 645 PM EDT Sat Sep 14 2024 A few showers will be possible in/around BWG this evening before they dissipate entirely. Otherwise, surface high pressure stretching from Maine to Missouri will keep skies mostly clear/partly cloudy and winds coming in from the east. Winds could get a little gusty tomorrow afternoon, especially at LEX. && .LMK WATCHES/WARNINGS/ADVISORIES... KY...None. IN...None. && $$ UPDATE...13 SHORT TERM...CJP LONG TERM...DM AVIATION...13