-- Discussion containing changed information from previous version are highlighted. --
837
FXUS63 KJKL 200915
AFDJKL

AREA FORECAST DISCUSSION
National Weather Service Jackson KY
515 AM EDT Mon May 20 2024

.KEY MESSAGES...

- Dry weather is expected area wide through Wednesday morning.

- There is a potential for showers and thunderstorms at times from
  Wednesday afternoon through Sunday.

- Very warm temperatures will persist through Wednesday. An
  increase in clouds and the possibility of rain will bring
  somewhat lower temperature after that, especially Thursday and
  Friday.

&&

.SHORT TERM...
-- Changed Discussion --
(Today through Tuesday)
Issued at 313 AM EDT MON MAY 20 2024

Southwest/northeast oriented ridging at all levels will slowly pass
east over the region during the period, resulting in dry weather
with mainly clear skies through this evening. Strong, nearly full
sun (within about a month of summer solstice) will result in very
warm afternoon temperatures on Monday, well into the 80s. Our
atmosphere aloft will continue to be very dry, creating good
radiating conditions despite a potential modest increase in high
clouds after midnight tonight. With light low levels winds,
valleys will readily decouple from the flow this evening, leading
to typical ridge/valley minimum temperature differences, as well
as valley fog. The temperatures differences will be greatest
tonight with weak warm air advection keeping ridges warmer.

A shortwave begins to move into the upper ridge over the area
Tuesday, resulting in a modest increase in moisture and
instability. This has resulted in a modest increase in PoPs, but
still below the 15 threshold needed to warrant a mention of any
precipitation the forecast.

.LONG TERM...(Tuesday night through Sunday)
Issued at 512 AM EDT MON MAY 20 2024

The 20/00z model suite is in good agreement at the beginning of the
forecast period (Tuesday evening) showing a 500H ridge axis
extending from an ~592 dam high over Central Mexico northeastward
across the Gulf Coast states, over the Carolinas, and then off
the Mid-Atlantic Coast. The corresponding surface high pressure
ridging axis, though still influencing the weather over eastern
Kentucky, will be solidly off the Atlantic Coast. To our
northwest, a weak 500H low will be transiting the Upper Midwest
while a trailing shortwave trough ejects off the Central Rockies.
At the surface, low pressure will be passing over the Great Lakes
while its attendant cold front trails back to the southwest
through the Mid-Mississippi Valley and on into the Central/Southern
Plains.

The ridging will continue to make a slow southeastward retreat on
Wednesday and Thursday while the low pressure to our northwest
lifts toward/into Quebec. The system`s associated cold front will
sag south of the Ohio River and eventually stall over the
Commonwealth on Thursday. A southern stream upper level
disturbance will then ride over the frontal boundary and through
the Ohio Valley on Friday and Friday night. The unsettled pattern
continues right into the weekend as another shortwave trough
tracks from the Central Rockies into the Great Lakes, attended by
another surface low. This system will briefly lifts the boundary
back north as a warm front on Saturday before cyclonic flow on
the back side of the system pushes the boundary back southeast as
cold front early next week.

Sensible weather will feature warm and dry weather through Wednesday
morning, before shower and thunderstorm chances slowly creep
southward later Wednesday and Wednesday night. At this point, shear
and instability appear modest but may be sufficient to support a few
strong to marginally severe thunderstorms on Wednesday afternoon and
possibly again on Thursday, if the front makes particularly slow
southward progress. Temperatures will run well above normal
through Wednesday night with high temperatures climbing well into
the middle and even upper 80s while nighttime lows range mainly in
the 60s. A few of the coldest sheltered northeastern valleys
could still dip into the upper 50s early Tuesday morning. While it
won`t be raining all of the time, daily shower and thunderstorm
chances are forecast through the remainder of the time period
with the afternoon and evening hours being favored for the most
widespread activity. Forecast maximum temperatures retreat to the
mid 70s to around 80 on Thursday and Friday before warming back
int the middle 80s by Sunday. Daily minimum temperatures should
generally range in the lower and middle 60s for most locations
from Thursday night on through the upcoming weekend.
-- End Changed Discussion --

&&

.AVIATION...(For the 06Z TAFS through 06Z Monday night)
ISSUED AT 111 AM EDT MON MAY 20 2024

Continuity was maintained with the 06z TAFs with no changes from
the 00z TAFs.

Other than fog, especially in the valleys during the 05Z to 13Z
timeframe, VFR conditions are anticipated. Guidance suggests KLOZ
and KSME should have a few hours of MVFR reductions, with valley
fog lifting into KSJS for a few hours near 12Z with reductions
possibly into the IFR range. Winds will average less than 10KT
through the period.

&&

.JKL WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

SHORT TERM...CMC
LONG TERM...GEERTSON
AVIATION...CMC