JKL issues Area Forecast Discussion (AFD) at May 20, 4:15 AM EDT329
FXUS63 KJKL 200815
AFDJKL
AREA FORECAST DISCUSSION
National Weather Service Jackson KY
415 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...(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 through Sunday)
Issued at 415 PM EDT SUN MAY 19 2024
We will start the extended period on the last dry day for the
remainder of the 7-day stretch. High pressure and upper level
ridging will be exiting to the east, but we will remain under their
influence throughout the day Tuesday. Meanwhile, return SW flow will
aid in increased WAA across the region, with highs topping out in
the mid and upper 80s once more.
At the same time, a strong low pressure system will be brewing
across the Central Plains during the afternoon on Tuesday,
coinciding with a deepening shortwave and development of a closed
low in the upper levels. This system will be quickly shifting
northeast, strengthening substantially by the time it reaches the
Upper Great Lakes by 12Z Wednesday. By this point it will already
start becoming occluded, with a warm front spreading east across the
Great Lakes region, and a cold front draped southward across the
Mississippi Valley. The end of this cold front will be in TX, where
another low pressure system exists. During the day Wednesday the
strong system will continue to push northeast, dragging the cold
front eastward. However, the southern edge of the front will become
stationary in TX, causing the front to become more elongated, laid
out from SW to NE across much of the eastern U.S., and directly
across the Commonwealth. Pops from this front will begin moving into
the JKL CWA by Wednesday afternoon, becoming more widespread during
the day Thursday as the front slows it's progression and becomes
stalled east to west across Kentucky.
With a lot of the forcing from the upper level system continuing to
move away from the state, and the front weakening, it is likely that
it will lose some energy heading into the nighttime hours Thursday
night, so kept with NBM backing down to scattered pops. However, the
ECMWF and GFS both show a surface low and shortwave moving across
the state during the day Friday. This, along with daytime heating
and increased lift/instability along the frontal boundary still in
place, could increase pops back to likely once more during the day
Friday.
A similar situation will happen Friday night into Saturday, with
pops decreasing during the overnight, and ramping back up during the
afternoon hours Saturday as the remnants of the boundary remain
present. Models are also showing a second system setting up to our
west Friday into Saturday. Unfortunately, there is no agreement on
the timing. If the GFS is true, it will be impacting eastern KY by
Saturday afternoon. Meanwhile, the ECWMF is quite a bit slower, with
the system just starting to impact the western end of the state late
Saturday afternoon/evening. Will be interested to see how these both
shake out. Either way, expect chances for rain and storms on
Saturday, just like the days leading up to it.
As for temperatures, Tuesday and Wednesday will be the warmest days,
ahead of the front and in the SW flow sector. Once the front moves
through and becomes stationary, clouds will also be a commonplace,
with temperatures maxing out in the upper 70s to around 80. Models
show a warm up back to the low to mid 80s by Saturday, but a lot of
this is dependent on the above-mentioned system brewing to our west
during that time, so expect these numbers to fluctuate over the
coming days as models begin to come into better agreement.
&&
.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...JMW
AVIATION...CMC
Source:
JKL issues Area Forecast Discussion (AFD) at May 20, 4:15 AM EDT---------------
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