Somerset, Kentucky 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

704
FXUS63 KJKL 221439
AFDJKL

AREA FORECAST DISCUSSION
National Weather Service Jackson KY
1039 AM EDT Mon Jun 22 2026

.KEY MESSAGES...

- Showers and thunderstorms today into this evening will bring the
  possibility of heavy rainfall and strong to damaging wind gusts.
  Training thunderstorms could lead to localized flooding.

- Lower humidity and dry weather arrive by late Tuesday and last
  through Wednesday.

&&

.UPDATE...
Issued at 1039 AM EDT MON JUN 22 2026

Late morning obs were blended into the forecast, without
substantive changes.

UPDATE Issued at 755 AM EDT MON JUN 22 2026

Areas of showers and a few thunderstorms are moving across
northern sections of the eastern KY/JKL CWA with another upstream
over Central KY/Bluegrass region. Further south a few stray
showers were occurring. Both of these areas should move across
northern sections of eastern KY this morning. After some training
of storms overnight, these storms appear to be more progressive.
Additional activity is likely to develop this afternoon/evening,
with the most solar insolation expected to occur in the south.
With higher instability in the more southern/southeastern
locations, those areas will have the highest chance for strong to
damaging wind gusts from clusters/small segments/multicell
activity. Otherwise, training of storms or repeated rounds over an
area will remain a concern through late this evening.

&&

.SHORT TERM...(Today through Tuesday)
Issued at 445 AM EDT MON JUN 22 2026

08Z sfc analysis shows a potent area of low pressure centered
over central Indiana with a warm front strung out northeast of
Kentucky. This system continues to pump warm and moist air into
the region ahead of its cold front that is slowly approaching from
the west. The initial round of thunderstorms associated with this
system has mostly died out over eastern Kentucky, but some
trailing storm cells look to soak parts of the area into dawn.
Otherwise, under mostly cloudy skies north and mostly clear
conditions south, temperatures currently vary from the mid to
upper 60s to the north - with the rain - to the low and mid 70s
in the rain-free south. Meanwhile, amid light southerly winds -
away from any storms, dewpoints are generally in the mid to upper
60s.

The models, and their individual ensemble suites, are in good
agreement aloft through the short term portion of the forecast.
They all depict an amplifying 5h shortwave passing through the
region today. This will bring with it fairly fast mid level flow
switching from southwest to northwest in direction as it passes
along with a fair amount of energy impulses passing over eastern
Kentucky amid modest height falls. Later tonight, this wave and
its attendant mid level energy will have moved off to the east
- mostly - allowing heights to rebound and some subsidence out
ahead and downstream of strong Desert Southwest ridging as it
starts to expand northeastward. Given the decent model agreement,
the NBM was used as the starting point for the forecast grids with
little adjustment outside of the QPF from WPC for the next 24
hours and PoP enhancement from the CAMs consensus through tonight.

Sensible weather will feature a low confidence forecast for
specifics but potentially locally high impact depending on if a
mesoscale boundary is able to set up over the JKl CWA and become a
focus for additional thunderstorm development leading to training
cells and locally excessive rainfall through the bulk of the
evening. Much of eastern Kentucky saw swaths of excessive rains
last week and remains primed for high water and runoff issues
should such training develop. PWS over the area are just high
enough to be a concern even without the potential for a boundary
to focus the convection. This boundary looks to set up roughly
east to west through the heart of the JKL CWA in the wake and as
part of the remnants of the MCS from last evening and early this
morning. Accordingly, out of an abundance of caution, a Flood
Watch has been issued for most of this part of the state through
11 pm this evening. Run to run model guidance has not been
consistent enough to raise the confidence level of this scenario,
but the potential seems enough to warrant extra highlighting and
caution via the Flood Watch. In addition to the flooding concerns
that training storms pose, some of the convection could become
quite strong with damaging wind gusts the main threat into the
evening hours, as well. Look for the main system`s cold front to
press south later this evening and overnight bringing an end to
the storm threats and actually ushering in some drier and more
comfortable air for Tuesday.

The main changes to the NBM starting point consisted of going with
the higher QPF from WPC today and tonight along with higher PoPs
per the CAMs. The temps and dewpoints where not adjusted much
considering the fairly high moisture content around the area
through Tuesday morning.

.LONG TERM...(Tuesday night through Sunday)
Issued at 330 AM EDT MON JUN 22 2026

High pressure will still be well in control for Tuesday night,
continuing through Wednesday night. While the high pressure system
will keep conditions dry during this time, the position of the high
will start to shift eastward, placing much of KY in the return flow
side with increased warm southerly winds. Highs Wednesday will rise
back into the low to mid 80s, with increased humidity as well.

Unfortunately, as the high pressure continues to shift eastward,
this opens up the region for more weather makers. The first will
start to impact eastern KY on Thursday, a strong upper level low
moves into the Upper Great Lakes Region and southern Ontario. Upper
level troughing will not be that strong, but a fairly potent low
pressure system will still be present across the Great Lakes Region
by 18Z on Thursday. With continued and increasing SW flow into the
state at the surface, a warm front will develop to our north during
the day Thursday. This will put much of KY in the warm and unstable
sector, introducing the potential for scattered showers and
thunderstorms throughout the day ahead of the associated cold
front.

The cold front itself will significantly slow its forward movement
heading into Thursday as the forcing low pressure system continues
to quickly shift eastward towards SE Canada and New England, and
begins to elongate the boundary. So rather than the cold front
actually passing through Kentucky on Friday, it will stall a bit,
and continue the shower and thunderstorm potential for much of the
state. Expect that generally precip chances will decline overnight
with the loss of daytime mixing/instability, and increase again
during the daytime hours both Thursday and Friday...however the
current forecast does still carry some isolated to scattered chances
both nights.

Things get a little interesting Friday night into Saturday as the
system starts to pivot and lift back north as a warm front across
much of the Central Mississippi Valley region, and stalls across
eastern Kentucky. The result will be a line of showers and
thunderstorms along the boundary from Friday night and through the
day Saturday. As of now the boundary remains in place across
Kentucky even into Sunday, continuing the rain and thunderstorm
chances. However, do want to note that the models do start to
diverge quite a bit heading into the weekend, especially for Sunday,
so expect that this forecast will still shift and change quite a bit
as we get closer in time.

Without a frontal boundary actually passing through the state, the
temperatures should not show any major changes, with highs generally
in the low to mid 80s and decent clouds and humidity to accompany
the warmer temperatures and rain chances for the second half of the
work-week. Tuesday night lows might be the coolest, in the 50s, with
the high passing nearby (strong subsidence and mostly clear skies)
and winds still generally northerly. After that point, expect
generally consistent lows in the 60s, which is fairly normal for
this time of year.

&&

.AVIATION...(For the 12Z TAFS through 12Z Tuesday morning)
ISSUED AT 800 AM EDT MON JUN 22 2026

Two areas of showers and storms were moving across the region this
morning, with one extending form near KJKL to KSJS at issuance
time while another area was over central KY/Bluegrass region and
poised to move across northern sections of the area, especially
KSYM and KIOB over the next 2 to 4 hours. With that in min, PROB30
for thunder was used for the more northern 4 TAF sites to begin
the TAF period. Some showers could affect KSME and KLOZ during the
first few hours of the period with a PROB30 used for this
possibility. Otherwise, convection should increase in coverage
and intensity generally after 16Z. There remains a good amount of
uncertainty concerning the evolution of the convection this
afternoon and evening, especially timing. Additional times of
prevailing MVFR or showers on station was used between 16Z and
04Z, with PROB30 groups for MVFR in thunderstorms on station.
Reductions to IFR or lower could briefly occur with the stronger
storms in addition to gusts of 35KT or higher. As the cold front
sags into eastern KY, from about 00Z onward, MVFR and even IFR or
lower ceilings should become prevailing.

&&

.JKL WATCHES/WARNINGS/ADVISORIES...
Flood Watch through this evening for KYZ044-050>052-058>060-068-
069-080-085>088-104-106>120.

&&

$$

UPDATE...HAL/GREIF
SHORT TERM...GREIF
LONG TERM...JMW
AVIATION...JP