Area Forecast Discussion
Issued by NWS Louisville, KY
Issued by NWS Louisville, KY
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812 FXUS63 KLMK 031038 AFDLMK Area Forecast Discussion National Weather Service Louisville KY 638 AM EDT Mon Jun 3 2024 ...Updated Aviation Discussion... .KEY MESSAGES... * Saturated ground, clear skies, and calm winds causing patchy dense fog this morning. Conditions will improve after sunrise. * Warm and muggy Monday, with temperatures in the mid- and upper- 80s. * Scattered to numerous storms will be possible Tuesday and Wednesday. A few strong to severe storms will be possible, especially Wednesday. The main threats will be heavy downpours and gusty winds. && .SHORT TERM /THROUGH TONIGHT/... Issued at 257 AM EDT Mon Jun 3 2024 Mostly clear skycover is across the region this morning as low- amplitude ridging and sfc high pressure sets in. Along with calm winds and saturated soils after our recent rains, patchy dense fog is developing across portions of the region. The more impactful fog will be across the Bluegrass and east of I-65 where the higher rainfall totals were yesterday. Morning fog will burn off after sunrise. Upper ridging and high pressure will keep our weather dry today, though the break from rain will be brief. WAA regime with SSW winds will make it warm and muggy, with temperatures in the mid- and upper- 80s, and dewpoints in the mid-60s. A condensed mid-level wave will be slowly approaching the lower Ohio Valley from Arkansas later today, which will promote some scattered precip activity across western Kentucky and Tennessee by the late afternoon and evening. It`s possible we could see a cell or two sneak into our CWA, but chances remain low. Will keep a dry forecast going until the very end of the Short Term period. For tonight, expect to see increasing cloud cover again as the mid- level wave approaches from the southwest. We`ll be dry through most of the night, but will eventually introduce a slight chance (less than 25%) PoP for our counties west of I-65 by 10z Tuesday morning. We`ll have a low level inversion keeping us stable at the sfc, but instability aloft will support a general isolated thunder mention. PoPs will continue to spread eastward through Tuesday morning. && .LONG TERM /TUESDAY THROUGH SUNDAY/... Issued at 549 AM EDT Mon Jun 3 2024 Tuesday - Wednesday Night... The upper ridge axis will be pushed east to the Appalachian spine by sunrise Tuesday. Meanwhile, lead shortwave activity will impinge into our region from the west. Models continue to show a deeply moist and modestly unstable atmosphere working into our area ahead of this shortwave for Tuesday. The end result should be scattered showers and thunderstorms developing in the afternoon and evening. Overall deep layer shear is expected to be pretty weak, so storm modes are expected to be largely pulse in nature. As a result, the main threat would be for locally heavy rainfall from slow moving, but efficient rainfall producing storms (PWATs up around 1.8"). In addition, localized gusty winds will be a threat wet microburst potential from any of the stronger storms. Convection should be mainly diurnally driven, however will keep some lingering pops into Tuesday night. After PM highs in the mid to upper 80s, overnight lows only drop into the 65 to 70 degree range. An early taste of summer-like temperatures. Southern Canada/northern Plains troughing becomes more prominent going into Wednesday, with an associated surface low tracking into the Great Lakes region. A cold front trailing from this feature will approach our area on Wednesday, and pass later Wednesday evening or night. More widespread showers and storms are expected to develop ahead of this front on Wednesday, and given a bit more deep layer shear we could have a bit higher threat of some organized thunderstorms (localized severe threat). That being said, still not totally convinced that the best deep layer shear will be in place in time. It appears it lags the frontal passage a bit, as the exit region of the mid/upper impulses is late to the game, and mainly confined to our northern CWA. Still some time to work out the details, but won`t change the message much. Wednesday looks to be the best chance for the the most widespread showers and storms, some of which could become strong. Gusty winds and locally heavy rainfall will be the main threats. Other threats would be dependent on the better shear profile arriving in time, which isn`t off the table yet. Thursday - Sunday... Cold front should be passing by sunrise Thursday. May have a few lingering showers, but overall much drier in the post-frontal and dry NW flow aloft regime. Given the cool advection behind the front, and an anomalous closed low expected to be somewhere to our north, temps should pretty confidently be cooler heading into late week/weekend time frame. Looking for highs back in the upper 70s to around 80 for the Friday to Sunday time frame. Best chances for any showers and storms increases again by later Saturday into Sunday, but confidence is low given divergence in model handling of the upper pattern. && .AVIATION /12Z TAFS THROUGH 18Z TUESDAY/... Issued at 637 AM EDT Mon Jun 3 2024 All the TAF sites except BWG are currently experiencing visibilities ranging from below minimums to slightly better IFR values. Expect the fog to persist until around 830 or 9 AM EDT, another hour of slowly improving conditions, and then back to VFR by 930 or 10 AM EDT or so. Outside of the early morning issues, expect dry and VFR conditions to prevail for the remainder of the day. Low level moisture will eventually find its way to a sct cloud deck around 4-5 K feet, along with a few upper clouds. Look for light SSW winds between 5 and 10 mph. A few storms could approach BWG and HNB toward the end of this TAF cycle, however think coverage and probability are too low to include in this cycle. && .LMK WATCHES/WARNINGS/ADVISORIES... KY...Dense Fog Advisory until 10 AM EDT /9 AM CDT/ this morning for KYZ025-028>043-045>049-053>057-064>067-077-078. IN...Dense Fog Advisory until 10 AM EDT this morning for INZ077>079- 090>092. && $$ SHORT TERM...CJP LONG TERM...BJS AVIATION...BJS