Somerset, Kentucky 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

277
FXUS63 KJKL 010158
AFDJKL

AREA FORECAST DISCUSSION
National Weather Service Jackson KY
958 PM EDT Thu Apr 30 2026

.KEY MESSAGES...

- Cool and mainly dry weather will prevail through the weekend,
  with frost possible around dawn on Sunday.

- The next area-wide potential for showers and thunderstorms will
  be Monday through Wednesday.

&&

.UPDATE...
Issued at 958 PM EDT THU APR 30 2026

While the previously-discussed cloud cover is beginning to creep
into the forecast area, observed temperatures have continued to
outpace the modeled diurnal cooling curve this evening. After
blending this quicker downward trend into the forecast grids,
overnight temperatures were bumped down in the sheltered and
shaded valley locales northeast of the KY-15 corridor. Upstream
cloud cover is not particularly thick or widespread at the
moment, but guidance continues to resolve increasing sky cover
around the 10,000-20,000 ft AGL layer tonight. This may eventually
mute the magnitude of the observed cooling, but it is becoming
increasingly likely that the hollows of Eastern Kentucky will see
MinTs in the 30s tonight. Patchy frost has been added to the
grids, but interests should note that this is contingent upon the
clouds continuing to under-perform previous insulation
expectations. The rest of the forecast remains on track, and a
cold frontal passage tomorrow will yield more widespread frost
potential later this weekend.

UPDATE Issued at 640 PM EDT THU APR 30 2026

The previous forecast remains on track this evening, with diurnal
cumulus clouds beginning to decrease in coverage in the latest
satellite imagery. A few high clouds are currently streaming
across the KY-30 corridor, and midlevel cloud coverage is resolved
upstream along the KY/TN border. The thicker upstream clouds
should spread northeast into the forecast area overnight as a
disturbance approaches, but there are some breaks observed within
them at the moment. If those breaks persist later this evening
and valleys are accordingly able to decouple, adjustments may be
necessary to tonight`s MinT grid. Hourly temperatures are already
running a couple of degrees colder than observations, but since
the thicker cloud cover is still forecast to build in from the SW
after sunset, no major adjustments were made to the MinT grid yet.
Rather, a quicker cooling trend was introduced in the hours
surrounding sunset, and we will continue to monitor satellite
trends as the evening progresses.

&&

.SHORT TERM...(This evening through Friday night)
Issued at 238 PM EDT THU APR 30 2026

The latest surface analysis reveals surface high pressure centered
over the Missouri Bootheel. North of this feature, a 1016 mb surface
low is diving from Minnesota into the Iowa and Illinois border
region; however, the local area remains under the regime of the
surface high. Despite this, lingering cloud cover and post-frontal
cold air advection are maintaining below-average temperatures across
the region.

Through the remainder of the day, dry conditions and cool weather
will persist due to the influence of the high pressure center and
northerly winds. High temperatures will trend several degrees below
climatological averages, topping out in the low to mid 60s. While
the region remains under the influence of the surface high, the
aforementioned low pressure system is forecast to migrate through
the Ohio Valley today, reaching the eastern Ohio Valley and southern
Great Lakes by Friday morning. Overnight periods will feature
increasing cloud cover associated with the approaching surface wave.
Despite the cloud cover, temperatures are progged to fall into the
upper 30s and lower 40s. These clouds should limit significant ridge-
valley splits, though any unexpected clearing could allow valley
temperatures to drop a few degrees lower than currently forecast.

Friday marks the approach of a cold front associated with the low
pressure system moving through the Ohio Valley. While Friday morning
will begin dry but cloudy, chances of precipitation will increase by
mid-morning as the front crosses the region. This activity will be
focused primarily across areas along and north of the Mountain
Parkway. Once the front exits Friday afternoon, surface high
pressure will build back into the region and remain dominant through
the rest of the period. High temperatures on Friday are progged to
range from the lower to upper 60s. Overnight lows are expected to
drop into the mid 30s across the north and the mid 40s near the
Tennessee border. If clearing occurs in the northern counties,
isolated instances of frost will be possible late Friday night into
Saturday morning mainly north of the I-64 corridor.

In summary, the period is characterized by surface high pressure
today, followed by a passing cold front that brings rain chances
Friday morning, specifically for northern and northeastern portions
of the CWA. High pressure returns late Friday, ushering in cooler
temperatures and a potential frost threat for Friday night into
Saturday morning.

.LONG TERM...(Saturday through Thursday)
Issued at 239 PM EDT THU APR 30 2026

The period begins Saturday with an upper trough extending from
southeastern Canada through the Great Lakes and the Ohio/Tennessee
Valley to the Lower Mississippi Valley, moving east to the Eastern
Seaboard early Sunday morning and then out into the Atlantic
thereafter. A surface low pressure will be along the Southeast US
coastline ahead of the parent trough, with widespread precipitation
from southern Virginia to the Florida/Alabama Gulf Coast, and this
feature will also be moving out to sea. Models remain in general
agreement that far southeastern Kentucky will be just beyond the
northwestern/northern edge of the widespread precipitation with this
feature, but there are a few AI ensemble members that suggest some
low-end PoPs are warranted, so will keep the NBM low-end PoPs going
for now.

Temperatures will be below normal through the weekend under
a cold advection regime as surface high pressure builds in from the
west under northwesterly flow aloft through Sunday. With clear skies
and light winds Saturday night into Sunday morning, lows will drop
well down into the 30s, with widespread frost a likelihood in the
valleys.

By Sunday night, surface high pressure begins to slide off to the
east, allowing for gradually increasing southwest to westerly
surface flow and increasingly westerly flow aloft ahead of a digging
trough over the north-central US. This digging trough will close off
into an upper low over Ontario/Quebec early next week, with a
surface front draped from the Lower Great Lakes and interior
Northeast US extending southwest to the Ohio River Valley. Thus,
PoPs are introduced to northern areas late Sunday night, with
progressively increasing PoPs Monday into Tuesday across all of
eastern Kentucky, persisting through Wednesday. Models differ from
run-to-run with the details, but an increasingly unsettled pattern
is expected for the first half of next week, with westerly flow
aloft and southwesterly surface flow ushering a warmer and more
humid air mass into eastern Kentucky.

&&

.AVIATION...(For the 00Z TAFS through 00Z Friday evening)
ISSUED AT 810 PM EDT THU APR 30 2026

VFR conditions prevail for the duration of the 00z TAF period.
Satellite imagery reveals that this afternoon`s diurnal cu field
is currently decreasing in spatial coverage. Additional midlevel
clouds are located upstream, but with some observed gaps in the
deck. These midlevel clouds will build into the forecast area
overnight, but given that upstream ceilometer readings are well
above VFR criteria, the clouds are depicted in the 00z TAFs with
broad-brushed scattered wording. More widespread cloud coverage
is expected tomorrow as a weak frontal boundary moves through.
There is a low-end chance for frontally-forced rain showers at
our northern terminals tomorrow, so PROB30 groups were retained
at KSYM for midday and then for KSJS in the afternoon. Given the
moisture-starved nature of the front, significant visibility
reductions are not anticipated. The boundary`s most noticeable
effects will come from its wind field. After light and variable
winds tonight, west-southwesterly prefrontal winds emerge after
sunrise tomorrow morning. Gusts up to 15 knots are possible in
the immediate vicinity of the boundary, and once frontal passage
occurs, winds shift to a more northwesterly orientation. A broken
mid- to upper-level cloud deck is forecast to linger behind the
front tomorrow evening, but it will once again remain above VFR
ceiling thresholds.

&&

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

&&

$$

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