Somerset, Kentucky 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

091
FXUS63 KJKL 091200
AFDJKL

AREA FORECAST DISCUSSION
National Weather Service Jackson KY
800 AM EDT Tue Jun 9 2026

.KEY MESSAGES...

- Multiple rounds of showers and thunderstorms are expected today
  through tonight. Slow storm motions and high humidity will
  support torrential downpours and an isolated flash flood risk,
  especially across the Cumberland River Basin.

- Rain chances decrease on Wednesday, leading into a hot and
  humid Thursday. Highs will approach record territory in the up-
  per 80s to near 90 degrees, with heat index values peaking in
  the mid to upper 90s.

- A cold front brings widespread showers and thunderstorms back to
  the region Friday afternoon and evening, accompanied by another
  risk for locally heavy rainfall.

- Drier, more comfortable weather returns for most of the area on
  Saturday behind the departing cold front.

&&

.UPDATE...
Issued at 800 AM EDT TUE JUN 9 2026

The MCV continues to maintain as is approaches from Central
Kentucky just after daybreak. Rain is already moving into the Lake
Cumberland area at update time and it is expected that much of
the area will experience a period moderate to heavy rain with
embedded thunder. CAMs, in the particular the HRRR, are
struggling to resolve this system. However, as long as the system
is able to maintain its moisture and instability feed, anticipate
that this system should reach the US-23 corridor by around 15Z,
but the overall system evolution is quite uncertain.

&&

.SHORT TERM...(Today through Wednesday)
Issued at 549 AM EDT TUE JUN 9 2026

Isolated showers continue across eastern Kentucky this morning while
temperatures and dew points remain substantially elevated relative to
normal with readings not far from 70F. The latest weather map shows
an ~1026 mb surface high centered to our east off the Delmarva
Peninsula/Chesapeake Bay with a nearly stationary surface front
extending from Myrtle Beach, SC, along the southern periphery of
the high northwest and then north over Tri-Cities TN, across far
eastern Kentucky into Columbus, OH, and then sweeping out an arc
through Chicago, IL, to Des Moines, IA, and back to near the
Oklahoma Panhandle. Looking aloft, we find a 500 hPa ridge
extending from the Carolinas northward toward James Bay while a
trough is found over the West Coast and Great Basin. Multiple
shortwave troughs are riding ENE into the ridge. The most
substantial shortwave extends from the Great Lakes southward into
Central Kentucky and Middle Tennessee where there is an ongoing
loosely cluster of convection under a potent 500 hPa vort max.
Another 500 hPa shortwave and vort max is noted upstream in the
vicinity of Kansas City, MO. PWATs are currently around 1.7 inches
across eastern Kentucky but are close to or exceeding 2.0 inches
under these aforementioned shortwave features.

The very moist air mass (generally greater than the 95th percentile
relative to climatology) will remain over eastern Kentucky through
the short-term period. This, combined with a deep warm cloud layer,
weak Corfidi upshear vectors, relatively slow storm motions (10 to 20
kts), and tall, skinny CAPE profiles, all support the threat of
torrential rainfall and backbuilding convection. Within this
environment, we will see those two aforementioned vort maxes
traversing our area during the course of the short-term period. The
first vort max and associated MCV-type structure will lift northeast
across the JKL CWA between ~12Z and 21Z. CAMs such as the HRRR
continue to struggle with how organized the convection will be as it
crosses the area, but given the parameter space, torrential rainfall
is certainly a concern with stronger cores and could become
hydrologically problematic if persistent backbuilding occurs. There
will be relatively little time between the first wave exiting late
this afternoon and evening and the approach of the next vort max and
pool of elevated PWATs this evening and overnight. The amount of
instability recovery between the exiting shortwave and this incoming
energy will be pivotal for where convection may set up tonight and
train or backbuild. Various CAMs have been hinting at a corridor of
rainfall sufficient for considerable flash flooding over the Lower
Ohio Valley. The expected timing of the leading shortwave and
vort max should theoretically preclude better instability recovery
over the JKL CWA and leave western and central portions of
Kentucky more vulnerable to a heavy rainfall event tonight into
early Wednesday morning.

Even so, the evolution of these two disturbances in this tropical
air mass will need to be monitored closely, and later shifts will
continue to assess the potential necessity for a Flood Watch if
probabilities increase for significant rainfall reaching into
eastern Kentucky tonight and early Wednesday. The Cumberland
River Basin appears most vulnerable to being impacted by tonight`s
system if the axis of heavier rainfall shifts east. Relatively
"drier" air gradually works in from the northwest on Wednesday as
the second vort max and shortwave departs, leading to lowering
PoPs through the day. Given the mesoscale nature of this rainfall
and the extremely moist air mass, forecaster confidence on
specific amounts remains only low to moderate. In reality, some
locales in eastern Kentucky could see very little or no
precipitation over the next 36 hours while other locations could
reasonably pick up 2 to 4 inches (or even more if the corridor of
significant rainfall sets up further east tonight).

In sensible terms, warm and muggy conditions will prevail across the
area with shower and thunderstorm coverage increasing this morning
before gradually waning briefly during the afternoon and evening.
Rain chances then increase again tonight, especially over the
Cumberland River Basin. Any shower or thunderstorm could produce
torrential downpours, and if persistent, could lead to flooding.
Shower and thunderstorm coverage then wanes on Wednesday morning with
just isolated to widely scattered activity during the afternoon. Look
for high temperatures ranging in the lower to middle 80s today and
mainly middle 80s on Wednesday, while nighttime lows dip to the mid
60s to near 70F tonight.

.LONG TERM...(After midnight Wednesday night through Monday)
Issued at 615 AM EDT TUE JUN 9 2026

The period opens with an upper level ridge over the eastern and
south central CONUS, with a deep trough centered over the High
Plains. At the surface, an area of low pressure will sit near the
border of Manitoba and Ontario, with a warm front draped to the
southeast through Ontario and into the Great Lakes region.
Additionally, a cold front will extend southward through the upper
Midwest and into the Plains. With a surface high located over the
Southern Appalachians, moisture advection via southwesterly winds
will continue to maintain a muggy air mass in eastern Kentucky.
Dewpoints will range from the upper 60s to the low 70s, but with
ridging aloft, a relative lull in convective activity appears
favored compared to earlier in the week (although there is still
some model disagreement regarding the robustness of this ridging).
Assuming rain chances remain low, Thursday looks to be the
hottest day of the forecast period, with highs extending into the
upper 80s or perhaps low 90s per the NBM; this is supported by
LREF mean 850 mb temperatures of around 20C, in addition to
current MOS guidance, so Jacksons record high of 90 degrees could
be in jeopardy, contingent upon a break in convection. Also, given
the moist air mass in place, apparent temperatures could soar
into the mid to upper 90s in some locations. Overnight,
temperatures should range from the mid 60s to the low 70s, with a
modest ridge-valley temperature split developing under mostly
clear skies and a marginally weak pressure gradient over the
forecast area.

By Friday, the eastward progression of the upper level trough
will push the Canadian surface low into Ontario, with the
associated cold front entering Kentucky by the afternoon.
Accordingly, showers and storms will be likely, with rain chances
maximized in the afternoon and evening hours. Given the pre-
existing moist airmass, mean LREF PW values will be in the
neighborhood of 1.6-1.8 inches ahead of the front; therefore,
there will be yet another chance for locally heavy rain and
isolated flash flooding. This moist air mass will also allow for
moderate instability to build with daytime heating; however, given
Kentucky will be located south of enhanced flow associated with
the upper level trough, shear will be modest at best, and there
will be diminishing upper level support for the front as it pushes
through our area. Additionally, there is still some disagreement
on the time of the frontal passage, with many models suggesting
the front could pass through our area overnight Friday into early
Saturday morning. This more unfavorable timing, in addition to a
lack of shear, indicates that widespread severe weather is not
currently expected, although frontal timing will bear some
monitoring in subsequent forecasts. Behind the front, drier air
will filter in as winds become more northerly with time, and
dewpoints will drop back into the low to mid 60s by Saturday
morning, allowing for cooler lows than previous nights.

Saturday will bring comparatively pleasant weather as postfrontal
winds keep highs confined to the mid 80s, a few degrees cooler
than in previous days. With the cold front having pushed south out
of our area, mostly sunny and dry conditions will be favored.
However, the front will eventually stall as it outruns upper level
support, and uncertainty still remains regarding where this will
happen, with a relatively thin margin separating eastern Kentucky
from the most likely positioning (NC/TN) of this front going into
Saturday evening. Therefore, the NBM has maintained some isolated
PoPs in our southeast to account for this uncertainty. Looking
ahead, eastern Kentucky will be under the influence of upper level
troughing for the remainder of the forecast period. Rain chances
look to return on Monday as another front approaches the area,
although uncertainty still remains high with this next system.

&&

.AVIATION...(For the 12Z TAFS through 12Z Wednesday morning)
ISSUED AT 800 AM EDT TUE JUN 9 2026

VFR conditions were prevalent at forecast issuance, though a few
sites including SME, were reporting MVFR. An MCV approaching from
the west is likely to bring a period of rain and thunder with
MVFR or worse conditions. Additional convection is then expected
during the afternoon and tonight, but coverage and timing will be
dependent upon the evolution of the incoming MCV. Light and
variable wind will become southwest at 5 to 10 kts with gusts
between 10 and 20 kts this afternoon.

&&

.JKL WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

UPDATE...GEERTSON
SHORT TERM...GEERTSON
LONG TERM...FAGAN
AVIATION...GEERTSON