Somerset, Kentucky 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

492
FXUS63 KJKL 312043
AFDJKL

AREA FORECAST DISCUSSION
National Weather Service Jackson KY
443 PM EDT Tue Mar 31 2026

.KEY MESSAGES...

- Persistent and breezy southwesterly winds are advecting a
  warmer-than-average and seasonably moist airmass into eastern
  Kentucky for the remainder of the work week.

- Expect several consecutive days with highs in the 70s to lower
  80s, and mild overnight lows in the 50s and 60s.

- Expect daily chances for showers and storms until a stronger
  cold front moves through the region later this weekend.

- Those showers and storms will produce highly beneficial rainfall
  across the forecast area.

- A few stronger storms may produce marginally severe hail and
  gusty winds tomorrow afternoon.


&&

.SHORT TERM...(This evening through Wednesday night)
Issued at 436 PM EDT Tue Mar 31 2026

Eastern Kentucky remains positioned within a regime of quasi-zonal
flow aloft today, with gusty southwesterly winds observed at the
surface. This surface flow is associated with pronounced ridging
over the SE CONUS, and gusts up to 35mph have been observed across
the forecast area today. These winds correspond with efficient warm
air advection and low-level moisture return. The forecast for
afternoon highs in the upper 70s/lower 80s and dewpoints in the 50s
remains on track, and this corresponds with the development of a
scattered to broken stratocumulus field today. A few sprinkles
remain in the forecast given the relatively taller appearance of
some of the clouds along the TN state line, but the vertical growth
of these cumulus-type clouds has generally been limited by a
pronounced capping inversion today. That cap is a byproduct of the
dry air advected into the midlevels via the aforementioned zonal
flow. However, guidance resolves the flow up to 500mb adopting a
more southwesterly orientation as a surface cold front approaches
the commonwealth from the north overnight.

Both the diurnal cumulus clouds and the magnitude of the winds/gusts
are forecast to decrease around sunset tonight. If enough clearing
comes to fruition, overnight ridge-valley temperature splits may
emerge. Confidence in this was not high enough to reduce valley
locales into the 40s like some of the more aggressive MOS guidance
suggests, but the sheltered/shaded valleys were dropped well into
the 50s tonight. Ridgetops are poised to remain in the lower half of
the 60s overnight thanks to the persistence of breezy southwesterly
winds, and if the valleys don`t decouple, the entire forecast area
could experience overnight lows near record maximum values. Another
confidence-limiting factor with tonight`s r/v splits is the arrival
of midlevel cloud coverage after midnight. These clouds will be
streaming off the upstream frontal system, and by the time the sun
rises, that boundary will be approaching the Ohio River.

Thanks to the persistence of the southwesterly low-level flow and
the increasing vertical depth of winds with access to tropical/Gulf
moisture, the atmosphere will be primed for more meaningful
precipitation chances tomorrow. Temperatures should climb into the
70s by mid-morning, and dewpoints should be in the 60s across much
of the area by midday. This establishes a thermodynamic profile that
favors convection, and the 12Z HREF resolves a mean 500-1000 J/kg of
surface-based CAPE across the forecast area by noon. Earlier in the
morning, this is accompanied by a bit of CIN, but some of this
afternoon`s CAM guidance resolves scattered, weaker convection in
this time frame. The greatest precipitation chances will come later
in the day though. The boundary is expected to become quasi-
stationary to the north of the forecast area tomorrow afternoon,
which allows the southwesterly wind profile over the commonwealth to
persist into the afternoon. This should allow for the convective
parameter spacing to recover, especially if the sun is able to peek
through the clouds after any AM activity. While the best frontal
forcing is forecast to remain displaced further to the north, the
HREF joint probabilistic data for favorable CAPE/shear/CIN
profiles is highlighting the potential for a few stronger storms in
the northern half of the JKL CWA. SPC has outlined a Day 2 Marginal
Severe Weather Outlook there, but widespread, significant severe
weather is not currently anticipated. 25-30 knots of 0-6 km bulk
shear and 1500+ J/kg of CAPE in the afternoon could lead to
marginally severe hail in any storms that are able to sustain a
core, but midlevel lapse rates are not particularly vigorous. Gusty
to locally damaging winds would also be possible within any quasi-
organized storm clusters or collapsing cores (mean DCAPE values are
around 900), but minimal low-level wind shear will keep the tornado
risk nil. Most of the forecast area will experience the general,
scattered sub-severe thunderstorms that our region experiences
during spring. QPF amounts are generally expected to be less than
half an inch, although locally higher totals are possible in
locations that experience multiple rounds of activity or any
stronger storms. Any rain that falls will be highly beneficial to
the antecedent dryness and fire weather concerns though.

Precipitation chances wind down with the loss of diurnal heating and
instability tomorrow evening. That frontal boundary is expected to
lift back north into Ohio as a warm front tomorrow evening, and
guidance resolves midlevel ridging nudging its way back into the
forecast area in its wake. These synoptics favor a clearing trend in
our forecast area tomorrow night, which bolsters confidence in
overnight r/v splits to close out the forecast area. Combined with
wet grounds, this could lead to the development of river valley
fog. In summary, Wednesday and Wednesday night`s sensible weather
indicates that we are entering a warmer and wetter weather
pattern here in Eastern Kentucky.

.LONG TERM...(Thursday through Tuesday)
Issued at 250 PM EDT TUE MAR 31 2026

The period starts on Thursday morning with a transitioning pattern
in the upper levels. A high pressure ridge will continue to build
off the Atlantic Coast, increasing heights across the eastern
seaboard. Meanwhile, an upper level trough turned closed low will
cycle through the central Conus, pushing northward along the rising
heights towards Ontario throughout the day.

Kentucky will find itself between the two systems on Thursday, with
the upper level low generally staying north and west, and heights
rising throughout the day. At the surface, a strong low pressure
system will be located across the Central Plains moving into the
Upper Mississippi Valley by the afternoon and Great Lakes by the
evening, in correlation with the upper level low also moving through
this same region. Moisture will be plentiful around this system,
with a defined strong cold front extending southward towards Texas
and a warm front extending eastward through the Great Lakes region.
Despite the high pressure and rising heights in place across eastern
KY during the day, we will also be in the warm sector of this
system, with increasing S to SW winds allowing for an influx of both
moisture and heat, and therefore instability. Therefore, there is a
possibility for some scattered showers and thunderstorms during the
afternoon hours with peak heat and mixing. Don`t expect these storms
to be severe, as there will be little forcing and sheer. They should
also diminish by the evening.

The surface low will make it just north of the Upper Great Lakes by
12Z Friday, keeping a frontal boundary placed NW of the state,
connected to a secondary low in the Southern Plains. Much like
Thursday, our placement in the warm and unstable sector of this
system will allow for an increased threat of showers and
thunderstorms, mainly during the afternoon when peak heating and
mixing are at their best. The NBM is showing likely chances in our
far northern CWA, likely due to it`s closer proximity to the low
pressure system to the north and boundary to the NW. However, the
strong ridging overhead will prevent weather systems from moving
directly eastward and through the Commonwealth or points to our
east. Instead, the surface low will continue to lift northeast
Friday night, with the cold front transforming to a lifting warm
front, and remaining well north of the CWA.

By 12Z Saturday, a strong upper level low will be in place across
the northern Plains. This system will result in longwave troughing,
and will finally break down the ridging in place as it moves
eastward throughout the day. Heights will lower from NW to SE across
the Commonwealth. With ridging breaking down, the associated surface
low pressure system will finally be able to push eastward along the
decreasing heights and traverse the Commonwealth. Kept with the NBM
pops and timing of the front as it moves through JKL`s CWA Saturday
evening through Sunday morning. This is still Day 5/6, but given the
strong influx warm air ahead of the system (temperatures topping in
the low/mid 80s on Saturday), coupled with a steep temperature
gradient and N to S flow behind this system (temperatures only
peaking in the 60s on Sunday), wouldn`t be surprised if there are
some decent storms along this system as it moves through. This will
be something to keep an eye on as we get closer.

Thankfully there is pretty good agreement of a robust high pressure
system moving into place across the state on Monday, which will keep
conditions dry. Temperatures will remain in the upper 50s and low
60s under continued NW flow...and while that seems cool in
comparison to temperatures leading up to this frontal passage, it`s
actually closer to average/normals for this time of year.

&&

.AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon)
ISSUED AT 216 PM EDT Tue Mar 31 2026

VFR conditions prevail at all TAF sites this afternoon, with the
previously-forecast diurnal cu field visible in the latest satellite
imagery. These clouds may be able to squeeze out a few sprinkles
before sunset, but little to no aviation impacts are expected from
them. Southwesterly surface winds, with gusts up to 30 kts, have
been observed across the forecast area today. As diurnal mixing
subsides this evening, the cu field is forecast to dwindle and that
gustiness is forecast to weaken. This leads to a period of quieter
aviation weather this evening, but a storm system approaching from
the northwest should yield an increase in midlevel clouds closer to
midnight. A low level jet associated with that system will spread
from NW to SE across the area around this same time frame, resulting
in 35 to 40 kts of LLWS from the southwest. Precipitation chances
increase after sunrise tomorrow morning, and this includes the
potential for some thunderstorms. This convection will pose the
greatest risk for MVFR ceilings and visibilities during the TAF
period, although the forecast chances for storms remain below 50%
before 18z tomorrow. As such, this has been handled with PROB30
groups for now.

&&

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

&&

$$

SHORT TERM...MARCUS
LONG TERM...JMW
AVIATION...MARCUS