Somerset, Kentucky 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

887
FXUS63 KJKL 141731
AFDJKL

AREA FORECAST DISCUSSION
National Weather Service Jackson KY
131 PM EDT Sun Jun 14 2026

.KEY MESSAGES...

- Unsettled weather returns today with widespread showers and
  scattered thunderstorms anticipated.

- Thunderstorms this afternoon and evening could produce locally
  heavy rain, potentially leading to isolated flooding, along
  with strong to locally damaging wind gusts.

- Cooler than normal temperatures are forecast to begin the work
  week.

- Unsettled weather is poised to return for the middle to later
  part of the new week. Strong to severe storms and locally heavy
  rainfall are possible from Wednesday night to Thursday night.

&&

.UPDATE...
Issued at 1020 AM EDT SUN JUN 14 2026

Mid-late morning update is out with an update to T/Td/Sky grids,
but opted to leave PoPs as-is despite the lack of convection
presently. Upper-level vort max is currently moving east through
the Lower TN Valley and far southern Ohio Valley, and will begin
to influence at least southern parts of the forecast area by early
afternoon, before a cold front and upper disturbance arrival and
passage this evening from the west and northwest.

UPDATE Issued at 810 AM EDT SUN JUN 14 2026

Convection is shifting across the eastern portion of the CWA in
association with a lead shortwave trough. An additional shortwave
trough and the cold front will approach later in the day and there
should be an uptick in convection following some heating later
this morning to midday/early afternoon. There is some uncertainty
as to to the evolution of convection this afternoon, though most
recent HRRR runs have a line or broken line with the cold front
crossing eastern KY late this afternoon and evening. The highest
chances for strong to damaging wind gusts should occur with the
line/broken line near the front.

&&

.SHORT TERM...(Today through Monday)
Issued at 450 AM EDT SUN JUN 14 2026

Early this morning, an upper level low was centered over Ontario
to the southwest of James Bay with an upper trough south across
the Great Lakes into sections of the MS and OH Valley to TN
Valley region. A couple of shortwaves were moving through this
trough one extending from SW OH to central KY to western sections
of TN. Some convection was occurring in advance of this from OH
south to the TN Cumberland Plateau as well as over sections of TN
into MS. Another shortwave was upstream of that over the mid MS
Valley to Ozarks vicinity while the main 500 shortwave trough
extended from the upper low across Lake Superior to the Upper MS
Valley to sections of the Plains/NE and SD border vicinity. At the
surface, a frontal zone extended from the parent low in Quebec to
a sfc wave in MI and then southwest to the mid MS Valley to
Southern Plains. Currently across eastern KY, sfc dewpoints
ranged from the upper 50s to low 60s near the VA border and nearer
to departing sfc high pressure over the Central Appalachians and
then ranged through the 6 0s elsewhere. Some low 70s dewpoints
were in place across sections of central and western KY. PW was
analyzed from 1 to 1.1 inches across southeastern KY to 1.5 to
1.9 inches from central KY west into western KY. These values were
below the 60th percentile in SE KY to the 80 to 90th percentile
across the remainder of the state.

Today and tonight, the upper level low in Canada should meander in
the vicinity of James Bay while the shortwave just upstream of
eastern KY moves across eastern over the next few hours followed
by the next shortwave moves across eastern KY this afternoon
followed by the main shortwave trough axis this evening. Broad
upper troughing should remain in place from the Great Lakes and
sections of the Central Conus/MS Valley into the Lower OH and TN
Valleys behind that system. The sfc frontal zone meanwhile should
precede the main shortwave trough across eastern KY late this
afternoon and evening. Then sfc high pressure should build into
the OH Valley from the Central Conus. This frontal zone should
stall across the Gulf states on Monday as the sfc ridge of high
pressure settles into the OH Valley to OK area.

Per the 00Z HREF mean PW should rise into the 1.6 to 1.9 inch
range by late this morning and remain near those levels until the
front passes on warm and moisture advection. These values
generally peak in the 90th to 97th percentile range. Uncertainty
remains in convective evolution through the rest of the overnight
through early afternoon, though upstream trends and some guidance
suggests an uptick in convection ahead of the shortwave trough and
associated moisture gradient prior to dawn and for a couple of
hours after dawn. This activity should be sub severe, but brief
heavy rain may occur. Any locations that pick up multiple storms
early this morning could be primed for later activity. Some
additional scattered activity may occur by midday through mid
afternoon as the second shortwave moves into the area. Guidance
generally has a line or broken line/line segments near the front
late in the afternoon/early evening. MLCAPE during that timeframe
should be quite modest 500 to 1250 J/kg with low level lapse rates
peaking around 7 to 8C/km with rather meager mid level lapse
rates. MUCAPE should generally peak at 1000 to 1500 J/kg with
bulk shear of around 20 to 35 KT with the higher shear values
anticipated across the north and east. This forecast combination
of shear and instability should be sufficient for the line
segments/broken line mentioned above with strong to locally
damaging wind gusts possible. As noted if some locations pick up
multiple storms during the early morning or the possible midday to
early afternoon round of convection and then again with
convection near the line, locally heavy rain and isolated
instances of high water or flooding are possible. All of these
threats are highlighted in the HWO and will also be covered on
social media and the web.

Once the front sags southeast of eastern KY prior to midnight, a
some thinning and clearing of cloud cover should occur as high
pressure begins to build in. Following the anticipated rainfall
to day and winds slackening, fog at least in valleys and perhaps
more generalized/areawide is possible. For now with some
uncertainty as to the degree of clearing, dense fog was left out
of the forecast grids, though it certainly cannot be ruled out in
areas that pick up the heavier rainfall amounts today. Fog should
lift and dissipate within about 3 hours of sunrise on Monday and
with the high continuing to build in a cooler and drier airmass
will be over eastern KY. Temperatures should mainly range through
the 70s for highs or roughly end up 5 to 10 degrees below normal
for mid June.

.LONG TERM...(Monday night through Saturday)
Issued at 230 AM EDT Sun Jun 14 2026

Broad upper-atmospheric troughing will dominate the synoptic weather
pattern over much of North America for the long-term forecast
period. Progressive shortwave disturbances are progged to rotate
around this feature, and there is above-average model agreement
regarding their positioning, timing, and evolution. As a result,
confidence is high that the first part of the period will be marked
by drier and seasonably pleasant conditions before a mid-week
warming trend emerges. That transition culminates in a return to
more active weather as a series of well-defined disturbances dig
into the Midwest and then the Greater Ohio River Valley during the
second half of the work week. A southern stream disturbance in the
western Gulf will funnel modified tropical moisture into the
forecast area in this same time frame, and medium-range models are
hinting at robust lower and upper level jet streak support across
the region from Wednesday into Thursday. These ingredients
collectively support increasing rain chances across the entire CWA
from Wednesday night into Thursday, and they paint enough of a
synoptic signal to suggest that some of this activity could come in
the form of strong to severe thunderstorms. The exact details of
that convective forecast will be determined by mesoscale nuances
that are difficult to discern at the current temporal range.
However, this setup has certainly caught our attention. Our forecast
area will likely be positioned within a regime of quasi-zonal flow
underneath the base of the trough axis through Friday. Thus, the
surface frontal boundaries associated with the disturbances aloft
will remain in our vicinity for multiple days in a row and create
the potential for multiple days of convective precipitation in a
row. As a result, we will also need to monitor the potential for
localized hydrological impacts during this stretch of active
weather. Thankfully, the mean troughing axis should dig deeper into
the Eastern Seaboard by next weekend and the boundaries should
accordingly shift south into the Tennessee Valley. Such a shift
would place the commonwealth in a regime of vertically-stacked
westerly to northwesterly flow, and the resultant dry air advection
allows the period to end on a quieter note.

When the period opens on Monday night, the forecast area will be
firmly under the influence of the cooler and drier early-week
airmass. Expect overnight ridge-valley temperature splits (ridgetops
in the 50s and valleys in the upper 40s) and subsequent river valley
fog formation. After any fog burns off in the AM, Tuesday looks to
be another dry and mostly sunny day. Afternoon highs will be a few
ticks higher on Tuesday than they were on Monday though, as west-
southwesterly surface winds will kickstart the aforementioned
midweek warming trend. With the warming trend comes increased
moisture and thus increased sensible weather forecast uncertainty.
Confidence was not high enough to commit to significant ridge-valley
temperature splits on Tuesday night, as the first shortwave looks to
dig into the region by Wednesday morning. This introduces breezier
winds, low-end rain shower chances, and relatively greater amounts
of sky cover to the forecast grids than on the previous night. Those
conditions would not favor large splits, but if the cloud cover
arrives late enough in the night, the sheltered and shaded eastern
valleys/hollows could still decouple.

The potential for showers on Wednesday morning could play a role in
determining the convective environment later that afternoon/evening.
Any residual boundaries left behind (such as an outflow or a
differential heating boundary) could act as a focal point for
another round of showers and storms as temperatures warm into the
80s on Wednesday afternoon. Breezy southwesterly winds could gust up
to 20mph during peak diurnal heating, and the shifting features
aloft will yield increasingly effective WAA and moisture return in
this time frame. Instead of dying off after sunset, those
winds/gusts are actually forecast to strengthen overnight into
Thursday. Sustained southwesterly winds between 10 and 15mph (with
gusts potentially approaching wind advisory criteria) will continue
to pump warm, moist air into the forecast area on Wednesday night,
and lows may not dip much below the 70 degree mark. This is atypical
for this time of year, and EFI/SOT data continues to signal that
unusual weather conditions are possible in this time frame. All
of this boils down to approach of a second, sharper shortwave,
which will be met with plenty of upper level kinematic support to
spark strong to severe convection upstream. Given the pattern and
the season, that convection will likely congeal into an MCS as it
moves towards the Bluegrass, where it will encounter the nocturnal
intensification of an 850mb jet streak to between 50 and 70
knots. Winds of this magnitude aloft will help provide ample shear
to sustain convection, and the unusually warm/windy conditions
forecast in our CWA that night will work to keep sufficient MUCAPE
in place. Thus, there was enough of a signal in the modeled
kinematic and thermodynamic environment for the Storm Prediction
Center to outline a severe weather outlook along the I-64 corridor
on Wednesday night and Thursday. Medium-range convective guidance
derived from machine learning, artificial intelligence, and
analogous event analysis data further support this notion, with
damaging wind gusts the most likely hazard type.

The mesoscale evolution of Wednesday night`s activity will play a
crucial role in determining the parameter spacing for any additional
convection in our forecast area on Thursday afternoon. Models
suggest that the surface front responsible for that activity will
not have made its way through the entire CWA by then. They also keep
30-40 knots of southwesterly 850mb flow over the CWA through
Thursday night. Depending on the amount of diurnal warming and
destabilization realized to the south of the boundary, another round
of strong to severe storms cannot be ruled out. With high freezing
levels and deep moisture in place, damaging winds would once
again be the favored hazard type. Regardless of severe storm
development, the potential for additional convective rainfall
bears watching. Localized hydrological issues may emerge wherever
multiple rounds of activity track, and this potential cascades
into Friday as the previously-discussed quasi-zonal flow regime
persists aloft. The compounding forecast uncertainty presented by
the mesoscale unknowns in this setup precludes the mention of
specific rainfall totals, but there is a 70-80% chance for at
least 1 inches of rainfall across the entire CWA through Friday
evening in the LREF data. When this threshold is increased to 2
inches, those probabilities hover around the 40-50% threshold. It
is important to note that the LREF does not have any explicitly
convection-allowing members in its ensemble. Thus, it will be
interesting to see how higher-resolution, CAM-inclusive ensembles resolve
these probabilities as the event approaches. At the very least,
this rainfall should prove beneficial to the area`s ongoing
drought concerns. We recognize that some of recent rain chances
have not come to fruition area-wide, but the parent features
responsible for those chances have been far more subtle than what
is emerging in the Wednesday to Friday window. The magnitude of
those features and the cumulative nature of this active weather pattern
demand attention, so interests are accordingly encouraged to stay
tuned to future forecast updates.

&&

.AVIATION...(For the 18Z TAFS through 18Z Monday afternoon)
ISSUED AT 130 PM EDT SUN JUN 14 2026

Scattered showers and thunderstorms will impact the entire
forecast area this afternoon, likely ending with a line of
showers and storms this evening moving across much of the area
from northwest to southeast. Gusty winds may accompany the cold
front passage, with an abrupt transition from west and southwest
winds to north to northwest winds. The strongest storms could
produce brief gusts as high as 25 to 40 kts. Otherwise, near and
behind the cold front between ~00Z and 06z, up to a few hours of
MVFR reductions in ceilings are possible, with at least partial
clearing thereafter. With weak cold advection through the night,
any fog after 06z should be limited to the deeper sheltered
valleys, and are thus not expected at this time to impact the
terminals.

&&

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

&&

$$

UPDATE...CMC
SHORT TERM...JP
LONG TERM...MARCUS
AVIATION...CMC