Somerset, Kentucky 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

511
FXUS63 KJKL 091933
AFDJKL

AREA FORECAST DISCUSSION
National Weather Service Jackson KY
333 PM 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 1002 AM EDT TUE JUN 9 2026

Blended morning obs into the forecast, without any overall
substantive changes.

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...(Thursday through Tuesday)
Issued at 333 PM EDT TUE JUN 9 2026

The forecast period will begin with the area positioned within the
warm sector of a surface wave migrating through central Canada. The
upper-level trough and its associated surface low are forecast to
eject northeastward through the day Wednesday, slowly meandering
eastward. By the start of the extended period, the center of the low
will remain in Canada, while its associated cold and warm fronts
will extend into the Upper Midwest and Great Lakes, respectively.
This synoptic setup places the forecast area in the warm sector
ahead of the approaching cold front. Consequently, this will bring
an increasing 20 to 40% chance of showers and thunderstorms to the
area on Thursday, primarily focusing across the eastern two-thirds
of the CWA. As instability wanes toward the evening, thunderstorm
activity will decrease, giving way to partly cloudy skies. Areas
that receive rainfall and clearing skies could experience locally
dense river valley fog through Friday morning. Temperatures within
the warm sector are projected to climb into the upper 80s to lower
90s, before dipping into the upper 60s to lower 70s overnight.

Friday brings the approach of the cold front along with heightened
chances for showers and thunderstorms throughout the day.
Probability of precipitation maximizes at 80% across much of the
area. Forecast soundings ahead of Fridays cold front indicate that a
potent thermodynamic environment could exist. Although forecast
vertical wind shear values remain meager, steep lapse rates combined
with both MUCAPE and MLCAPE exceeding 2,500 J/kg will be present.
Furthermore, DCAPE approaching 900 J/kg points toward a pulse
thunderstorm environment capable of producing gusty outflows.
Precipitable water values approaching 1.90 inches also lend credit
to heavy rainfall potential. This combination of factors has
prompted a Day 4 SPC 15% severe weather outlook alongside a Day 4
WPC Marginal Risk for excessive rainfall. Once frontal passage
occurs, skies will clear and weak surface high pressure will build
into the area by early Saturday morning. Pre-frontal daytime
temperatures are expected to reach the upper 80s to lower 90s, but
weak CAA behind the front will allow overnight lows to drop into the
low to mid-60s Friday night.

Surface high pressure will firmly build into the region behind the
front for Saturday into very early Sunday. Daytime highs are
forecast to start in the low to mid-80s on Saturday, climbing a few
degrees higher by Sunday, while overnight lows range from the low to
mid-60s each night. Unfortunately, this weak surface high pressure
will be pushed out of the area late Saturday night as a secondary
cold front drops southeastward into the region. This next system
will bring increasing shower and storm chances beginning Sunday
morning and persisting through the end of the period. Under the
influence of these persistent rain chances and subsequent cloud
cover, temperatures on Monday and Tuesday will be notably cooler,
averaging about 10 to 15 degrees cooler than Saturday and Sunday.

The area will experience warm temperatures and a few storms on
Thursday before a strong cold front arrives on Friday, bringing a
high chance of heavy rain and strong, gusty thunderstorms. High
pressure will bring a brief stretch of dry and pleasant weather for
most of the weekend. However, a second cold front will move into the
region late Saturday night, causing rain chances to return on Sunday
and bringing much cooler temperatures for Monday and Tuesday.

&&

.AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon)
ISSUED AT 220 PM EDT TUE JUN 9 2026

Conditions varied widely at the start of the period, with reports
of LIFR to VFR in the forecast area. The most widespread poor
conditions were generally north of the Mountain Parkway, where
rain has been ongoing. However, there are also isolated showers
and thunderstorms further south.

Widely varying conditions are forecast to persist through the
period, with showers and thunderstorms at times. Aside from the
precip slowly winding down in the north currently, the greatest
potential for showers and thunderstorms is overnight into
Wednesday. However, confidence in the timing/location is rather
low, and this is reflected by liberal use of PROB30 and TEMPO
groups in the TAFs.

&&

.JKL WATCHES/WARNINGS/ADVISORIES...
Flood Watch through Wednesday morning for KYZ044-050>052-058>060-
068-069-079-080-083>087-104-106-108-111-112-114-116.

&&

$$

UPDATE...HAL/GEERTSON
SHORT TERM...GEERTSON
LONG TERM...VORST
AVIATION...HAL