Somerset, Kentucky 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

138
FXUS63 KJKL 160335 AAA
AFDJKL

AREA FORECAST DISCUSSION...UPDATED
National Weather Service Jackson KY
1135 PM EDT Sun Mar 15 2026

.KEY MESSAGES...

- A line of strong to severe showers and storms will cross the
  area between midnight and 6 AM Monday. Damaging winds and a
  brief tornado are possible, highest risk near Lake Cumberland.

- Temperatures will crash Monday morning, turning rain showers to
  snow. Sudden, heavy snow squalls Monday afternoon and evening
  could cause hazardous travel conditions and rapid drops in
  visibility.

- Winter-like cold briefly returns Tuesday with highs only in the
  30s before a warming trend arrives mid-week.

&&

.UPDATE...
Issued at 1135 PM EDT SUN MAR 15 2026

Severe storms and indications of a few tornadoes continue to
progress eastward toward the JKL CWA. SPC has outlined the
northern parts of Kentucky for a likely SVR watch with damaging
wind gusts as the main threat - but a couple of brief spin-up
tornadoes cannot be rules out. This may stay just out of the JKL
CWA. Regardless, do expect the leading edge of the storms to
become more linear with time early overnight while they move into
a less favorable environment, but not before forming a potent cold
pool that will help sustain the strength of the leading edge
storms and gust front. In the meantime, no significant changes
were made to the forecast with mainly just the inclusion of the
latest obs and trends for the T/Td/Sky grids as well as a tweaking
of the PoP timing per latest WoFS and CAMs guidance. These
adjustments have been sent to the NDFD and web servers along with
a freshening of the WSW, HWO, SAFs, and zones.

UPDATE Issued at 825 PM EDT SUN MAR 15 2026

23Z sfc analysis shows deep low pressure moving through the
southern portion of the Great Lakes. This is pushing a sharp and
powerful cold front east through the Ohio Valley - poised to enter
western parts of the state over the next couple of hours. Some
discrete cells are developing ahead of the front and could lead to
storms arriving ahead of the main boundary. Even with this,
timing for storms to arrive mostly after midnight is on track.
Currently, temperatures are still quite warm and well mixed -
running in the upper 60s and lower 70s. Meanwhile, amid gusty
southerly winds of 15 to 25 mph with higher gusts, dewpoints vary
from the mid 50s southwest to the lower 40s in the northeast - a
limiting factor in our instability ahead of the inbound cold
front. Have updated the forecast mainly to add in the latest obs
and trends for the T/Td/Sky grids and touch up PoPs before the
main line arrives per the latest CAMs guidance. These minor
adjustments have been sent to the NDFD and web servers along with
a freshening of the NPW, SAFs, and zones.

&&

.SHORT TERM...(This evening through Monday night)
Issued at 545 PM EDT SUN MAR 15 2026

Eastern Kentucky is basking under a May-like brand of warmth with
widespread temperatures in the 70s this afternoon under partial
sun and a gusty southerly breeze, a far cry from what is in store
for tomorrow afternoon. The latest weather analysis shows an
around 991 mb low between St. Louis and Chicago, leaving eastern
Kentucky under the low`s warm sector. A powerful cold front and
developing severe squall line extend south-southwest from the low
across the Ozarks down into eastern Texas. On the cold side of
this low pressure system, a bitter arctic air mass is spilling
into the north-central CONUS from the Canadian Prairies;
temperatures along the ND/Canadian border are in the single
digits. Meanwhile, an early spring blizzard is developing from
Iowa into northern Michigan. At the upper levels, this powerful
storm system is developing ahead of a digging 500 hPa trough axis
extending from Manitoba southward to Texas.

The warm, dry, and breezy conditions will persist into this
evening, leading to an elevated fire danger threat, particularly
east of the Pottsville Escarpment where greater downslope drying
will continue downwind of the Southern Appalachians leading to
relative humidity values of 25 to 40 percent. Peak wind gusts in
the 25 to 45 mph range have been commonplace, strongest in the
Wind Advisory area along and west of the Pottsville Escarpment
(closer to the core of the low pressure system`s warm conveyor
belt jet). As the sun sets, momentum transfer is likely to become
less efficient for several hours this evening, allowing the gusty
winds to slacken somewhat even though winds aloft will increase as
the low pressure system`s cold front and preceding warm conveyor
belt jet shift eastward. As the parent surface low deepens to near
980 mb and treks across lower Michigan, the 15Z RAP13 and the
broader 12Z LREF suite support further intensification of this jet
core at 850 hPa to 60+ knots just ahead of the cold front late
this evening and early overnight. Steepening low-level lapse rates
as moistening occurs in the mid-levels should support more
efficient mixdown in the hour or two before the leading edge of
the squall line arrives. With BUFKIT guidance showing the
potential for more than 40 kts of mixed-layer momentum transfer,
the Wind Advisory from the Pottsville Escarpment westward was
extended in time through the frontal passage while counties
further east were placed under a separate Wind Advisory from 12 AM
Monday to 8 AM Monday. Thus after today`s winds, all of eastern
Kentucky will experience a second round of stronger environmental
winds overnight outside of the approaching frontal squall line (or
QLCS).

The QLCS itself will pose additional hazards as it approaches
from central Kentucky, reaching the Lake Cumberland area around
midnight to 1 AM and eventually exiting through Pike County by
around 6 AM. While the most favorable parameter space appears to
be upstream over central and western Kentucky, guidance still
suggests sufficient instability to maintain an HSLC QLCS through
the I-75 corridor. Of note, 18Z NAMNEST/HRRR show the squall line
beginning to outrun the forcing provided by cold front`s surface
theta-e gradient as it moves between I-65 and I-75 this evening.
That dissociation becomes more stark further east, leading to an
accelerated weakening of the QLCS by the time it approaches the
US-23 corridor early Monday morning. Additionally, pre-frontal
SBCAPE ranges from 100 to 250 J/kg in the RAP13 over western
portions of the CWA but wanes to mere tens of J/kg further east,
so the overall weakening trend makes sense as the system runs low
on fuel (instability) and cold pool momentum. With that in mind,
RAP model soundings still show 40+ knots of 0-1 km bulk shear,
yielding 250+ m2/s2 of 0-1 km storm-relative helicity and 50 to 55
knots of 0-3 km bulk shear from the south-southwest. Thus, any
line segment that surges and becomes more NW-SW oriented will have
a better chance of utilizing that shear to produce damaging
straight-line wind gusts and possibly even a brief spin-up
tornado. SPC has the western portions of Wayne and far western
Pulaski counties under an Enhanced (3/5) risk for severe weather
for damaging wind gusts and a tornado threat (makes lots of sense
given the best parameter space is likely to be in place there). A
Slight Risk (2/5) extends eastward from there to the US-23
corridor and a Marginal Risk (1/5) remains further east. Of note,
SPC has maintained Level 1 Intensity hatching for the wind and
tornado threats near and west of the US-23 corridor, indicating an
environment supportive of at least isolated significant wind
gusts (74+ mph) and up to EF-2 tornadoes. Again though, the
highest threat of significant severe weather should coincide with
the better instability--southwest of KY-15 and especially west of
I-75. It is worth noting that severe weather may occur with this
squall line in the absence of thunder as ELs and instability may
be too marginal in some areas for the generation of lightning.

Behind the leading edge of the squall line, a period of trailing
stratiform precipitation can be expected along with a wind shift
to the west, albeit sub-advisory winds. Balmy temperatures in the
60s ahead of the front are likely to drop sharply behind the
front Monday morning as the stratiform rainfall tapers to
showers. In fact, a little snow could begin mixing in across the
Lake Cumberland area by 12Z. As temperatures tumble through the
50s, 40s, and into the 30s, that transition to snow showers should
be complete across the entire area by early Monday afternoon.
Ongoing moderate CAA and diurnal heating will support surface to 3
km lapse rates steepening to around 8 C/km during the afternoon
while the 2 PVU surface dips to near 500 hPa (indicating deep,
dynamic forcing), leaving our region on the poleward side of an
impressively deep undulation of the 250 hPa jet. This will also
place eastern Kentucky in a highly favorable environment for snow
squalls from Monday afternoon into Monday night while air
temperatures crash into the 20s at lower elevations and into the
teens above 2,500 feet. Very warm ground temperatures starting in
the 50s and 60s this evening will be a strongly mitigating factor
for snow accumulation. However, snowfall rates in snow squalls
could become intense enough to overcome ground heat temporarily
and leave slippery, slushy accumulations on roadways (even at
lower elevations) in addition to causing sudden, drastic reductions
in visibility. With wind speeds at the mixed layer near 35 to 40
knots, the strongest squalls could also generate wind gusts
nearing similar strength. Furthermore, ELs near or even colder
than -20C could support instances of thundersnow in the most
intense squalls. Snow showers and the overall risk for snow
squalls should gradually diminish Monday evening and night with
the loss of diurnal heating and a lowering of the ELs.
Temperatures will cool most rapidly at the higher elevations near
the KY/VA border, so confidence in winter weather impacts was
high enough to issue a Winter Weather Advisory for Harlan and
Letcher Counties. However, additional lower elevation locations
may need a Winter Weather Advisory if snow squalls become numerous
and/or persistent.

.LONG TERM...(Tuesday through Sunday)
Issued at 147 PM EDT SUN MAR 15 2026

The forecast period begins with the Commonwealth situated behind a
departing cold front as surface high pressure builds into the
region. Lingering snow flurries remain possible through the first
few hours of the period; however, as the parent surface low tracks
northeast toward Hudson Bay, any remaining precipitation will taper
off. Along with these isolated PoP chances, breezy conditions will
persist through the early afternoon. As the upper-level trough lifts
northeast and the surface pressure gradient relaxes, winds will
slacken toward the late afternoon and early evening. Northwesterly
flow will continue to advect a colder air mass into the area, with
high temperatures struggling to reach the low to mid-30s. Overnight
lows are progged to fall into the upper-teens to lower-20s. While
cold, persistent cloud cover should limit the potential for
significant ridge-valley temperature splits.

By Tuesday night, low-level flow will shift west-southwesterly as a
clipper system dives out of the northern Rockies, leading to
increasing PoPs for Wednesday. As this clipper moves through, an
initial rain-snow mix is possible before thermal profiles warm
sufficiently to cause a transition to all rain. With the current
storm track centered over the Ohio Valley, precipitation chances
remain at 20 percent or less, with the highest probabilities
confined to the northern CWA. A second impulse is progged to move
through the flow Wednesday night into Thursday morning. This feature
is meteorologically similar to the Wednesday clipper but is
displaced further north; consequently, a 20 percent PoP or less
exists again mainly for the northern portion of the CWA.

Otherwise, surface high pressure builds back into the region for
Friday, allowing temperatures to moderate above seasonal averages. A
third passing system may bring isolated PoP chances to the region
overnight Friday into Saturday morning, though current guidance
keeps the bulk of this system north of the Ohio River.

The period is highlighted by the arrival of cold high pressure on
Tuesday. A series of passing clippers will bring isolated rain or
snow chances Wednesday, Thursday, and possibly Saturday. A warming
trend will establish itself by the middle of the week, with
temperatures remaining above average through the remainder of the
period.

&&

.AVIATION...(For the 00Z TAFS through 00Z Monday evening)
ISSUED AT 745 PM EDT SUN MAR 15 2026

VFR conditions prevail through the first ~6 hours of the TAF
period, though as a low-level jet intensifies ahead of a powerful
approaching cold front. A lull in the strongest winds can be
expected this evening until the arrival of the cold front and its
associated squall line. Isolated wind gusts in excess of 50 kts
will be possible as the front marches from west to east across the
area between 04 and 10Z. A rapid deterioration in ceilings will
occur with and behind the squall line as a lighter stratiform
rain lingers behind the boundary. After a brief break in the
precipitation Monday morning, snow showers develop toward midday
with organized snow squalls possible during the afternoon. Post-
frontal winds will be sustained west southwest at 10 to 20 kts
with gusts up to 30 kts on Monday. Only slow improvement is
expected through the rest of the period.

&&

.JKL WATCHES/WARNINGS/ADVISORIES...
Wind Advisory until 6 AM EDT Monday for KYZ044-050-051-058>060-
068-069-079-080-083-084.

Wind Advisory until 8 AM EDT Monday for KYZ052-085>088-104-
106>120.

Winter Weather Advisory from noon Monday to 8 AM EDT Tuesday for
KYZ088-118.

&&

$$

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