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
111 FXUS63 KLMK 081711 AFDLMK Area Forecast Discussion National Weather Service Louisville KY 1211 PM EST Fri Nov 8 2024 ...Updated Aviation Discussion... .KEY MESSAGES... * Dry today with a mix of sun and clouds, and temperatures range in the 60s. * After a dry start to the weekend, widespread rain is forecast for Saturday evening through Sunday. 1 to 1.5" of rain expected for most. * Dry early next week, with the next chance for rain arriving midweek. && .UPDATE... Issued at 1016 AM EST Fri Nov 8 2024 Current forecast remains on track and only minor adjustments were made to account for current observational trends. Light northeast winds will keep the dry air advection over the area, clearing the low-level cloud deck across the southern Kentucky. Meanwhile, upper- level flow will transport cirrus clouds from the Mid Mississippi across the Ohio Valley, but cloud optical depth should not block solar radiation. As a result, maximum temps will climb to the mid 60s along the Ohio River to potentially around 70 in the south. && .SHORT TERM /THROUGH TONIGHT/... Issued at 306 AM EST Fri Nov 8 2024 Low stratus deck is bisecting Kentucky this morning, but very dry air filtering in from the north is helping to push the cloud deck to the south. Just about all of the region should clear out from the low stratus deck this morning, but there`s a chance for the Lake Cumberland region to hold on to the low clouds for a little later than anywhere else. Model soundings are a good representation of the dry column for today, with the bulk of the dry layer below 400mb through the afternoon, leading to a dry forecast for the entire area. Increasing upper clouds will replace the low stratus later today, which will keep a mix of sun and clouds in the forecast. Model soundings and HREF cloud cover guidance have good agreement on this. Temps are expected to range in the 60s, which will end up being a few degrees above our normals for early November. For tonight, sfc high pressure will be centered over the Great Lakes, which will place us in a light NNE wind pattern in the lower levels. A large occluding low pressure system over the Central Plains will be spreading clouds out to the east, so we can expect to see a continued increase in high level clouds over overnight. The remarkably dry layer in the column with persist tonight, so a completely dry night is forecast. Temperatures will range in the 40s, with the cooler readings expected to be in the Bluegrass and southern Indiana areas. && .LONG TERM /SATURDAY THROUGH THURSDAY/... Issued at 306 AM EST Fri Nov 8 2024 Saturday - Sunday night... Progressive shortwave ridging will initially be in place over the Ohio Valley Saturday morning. A closed low is forecast to be spinning over the CO/KS High Plains. High pressure at the sfc and aloft quickly shifts east of the region as low pressure lifts northeast across the central Plains. Southerly WAA and moisture transport into the region increase, especially during the second half of the day. However, lingering dry air in the low to mid-levels will keep the vast majority of the CWA dry into the afternoon hours. Look for a relatively dry Saturday, with increasing clouds and highs in the mid 60s to near 70. As the wave ejects northeast over the Midwest Saturday night, favorable jet dynamics and deep moisture will overspread the Ohio Valley. Still expect a period of fairly widespread moderate rain Saturday night through Sunday. PW values are forecast to reach 1.5- 1.6 inches, which is near the BNA Max Moving Average for this time of year. ECMWF Extreme Forecast Index (EFI) for QPF is around 0.7 for the Sat night-Sun time frame, increasing forecast confidence in an unusually rainy episode. Rainfall amounts of 1.0-1.5 inches still look likely for most, though could see 1.5+ inch totals in south- central KY. Forecast soundings continue to show a fairly stable environment Saturday night and Sunday, especially in the lower levels. The risk for severe weather is low, though Sunday will be a bit breezy. There is a slight risk for thunder on Sunday. Lows will be in the 50s, with highs in the mid/upper 60s. The cold front is forecast to sweep through late Sunday, with conditions drying out from NW to SE Sunday night. Lows Monday morning should range from the low/mid 40s in southern IN to the low 50s near Lake Cumberland. Monday - Thursday... The weather looks pleasant and dry early next week with high pressure building east across the Ohio Valley and Great Lakes. Highs in the low to mid 60s will be common, with morning lows in the upper 30s to mid 40s. Another storm system organizing over the central part of the country will likely bring us additional rainfall Wednesday into Thursday. However, there remains quite a bit of spread in the evolution of key synoptic features. Some deterministic model runs feature quite a deep and dynamic low pressure system, but forecast confidence in the details remains low. Thus, both SPC and the CSU ML forecasts do not highlight any meaningful severe weather probabilities at this time. && .AVIATION /18Z TAFS THROUGH 00Z SUNDAY/... Issued at 1211 PM EST Fri Nov 8 2024 VFR conditions will continue through the current TAF period. Dry air moving further south into the area have eroded the MVFR cloud layer that was present early this morning over BWG and RGA. For the next 24 hours, only upper clouds will stream from the west while surface winds shift from the north-northeast to the east by tomorrow morning thanks to high pressure traveling across the Great Lakes. && .LMK WATCHES/WARNINGS/ADVISORIES... KY...None. IN...None. && $$ UPDATE...ALL SHORT TERM...CJP LONG TERM...EBW AVIATION...ALL