JKL issues Area Forecast Discussion (AFD) at Oct 15, 7:31 PM EDT316
FXUS63 KJKL 152331
AFDJKL
AREA FORECAST DISCUSSION
National Weather Service Jackson KY
731 PM EDT Thu Oct 15 2026
.KEY MESSAGES...
- Showers remain possible at times through Friday night.
- Much cooler weather arrives for the weekend - the coldest we
have experienced so far this autumn. This poses a risk for frost
on Saturday night into Sunday morning, and again for Sunday
night into Monday morning for many area valleys.
&&
.SHORT TERM...(This evening through Friday night)
Issued at 445 PM EDT THU OCT 15 2026
Late this afternoon, an upper level ridge was centered off the
Southeast US Coast and extended from the Atlantic into the Southeast
Conus. Further west, upper level troughing extended from near
Hudson Bay into the Plains to Central Plains. At the surface, a
boundary that had stalled out over the area earlier in the day
was lifting to the northeast as a warm front in advance of a sfc
low tracking from the mid MS Valley vicinity toward the Great
Lakes. Isolated mainly weak convection was occurring from the
Bluegrass region east near the I-64 corridor into western West
Virginia. A few sprinkles were occurring further south. Late
afternoon temperatures ranged from the upper 80s near the TN
border to the mid to upper 70s in the north and east.
The upper level ridge will become centered off the southeast U.S
coast tonight and tomorrow which will allow the upper level trough
to approach the eastern Conus from the west. An initial shortwave
should pass northwest of eastern KY tonight, while the main
trough axis progresss into the western Great Lakes to mid MS
Valley tonight and then reaches the eastern Great Lakes to Lower
OH Valley to Gulf coast vicinity on Friday evening. This will be
preceded by the previously mentioned sfc low tracking across
central sections of the Great Lakes to the St Lawrence Valley. The
boundary currently lifting north will move north and east of
eastern KY this evening. Meanwhile, the trailing cold front will
progress across the Commonwealth tonight through midday on Friday,
crossing eastern KY during the day.
Chances for showers wane this evening, with the boundary moving
north and loss of daytime heating. With a moist airmass in place
and the approaching cold front, mild overnight lows compared to
mid October normals are anticipated for tonight. Highs for Friday
occur during the morning, before temperatures drop by midday into
the afternoon on west to northwest winds. Cooling temperatures
aloft and the approach of the upper trough and passing front will
result in shower chances for Friday with light amounts.
The upper trough continues east and crosses eastern KY on Friday
night particularly nearer to the VA border. Lingering low level
moisture and upslope flow will result in chances for showers/light
rain lingering Friday evening into Friday night. Lows will be
cooler than recent nights in the upper 30s to mid 40s.
.LONG TERM...(Saturday through Thursday)
Issued at 555 PM EDT Thu Oct 15 2026
The central theme of the long term forecast period is the advection
of a cooler and drier airmass into Eastern Kentucky on Saturday. In
the wake of Friday's FROPA, a building surface anticyclone will
yield northerly and then east-northeasterly surface winds across the
forecast area this weekend. Combined with northwesterly flow around
the backside of the mean troughing aloft, this shift will end the
production of any lingering upslope rain showers by midday Saturday.
A modified continental polar airmass moves into the region in its
wake, and temperatures will likely struggle to get much warmer than
the mid 50s in Eastern Kentucky on Saturday afternoon. Increasingly
efficient diurnal mixing could lead to breezy wind gusts up to
20mph, but it should also help to scatter out the remaining clouds
by Saturday evening. This, in turn, sets the stage for efficient
radiational cooling overnight, and the area appears primed for the
first significant frost of the season by Sunday morning.
As a reminder, the criteria for a Frost Advisory is defined as
minimum shelter forecast temperatures between 33 and 36 degrees
Fahrenheit during the growing season, on nights with good
radiational cooling conditions like light winds and mostly clear
skies. The aforementioned postfrontal surface high moves overhead on
Saturday night, leading to a lighter gradient winds and further
reinforcing the notion that the area will see clear skies on
Saturday night. The NBM ensemble data continues to resolve a 60-90%
chance for minimum temperatures to fall below that 36 degree
criterion, and frost headlines are likely to be issued soon. With
that being said, the magnitude of the frost will likely be somewhat
elevation-dependent. Confidence in widespread frost is greatest in
the most sheltered and shaded valley locales, which could make a run
at the 32 degree mark. There remains a 20-40% chance within the
ensemble data for temperatures to reach the freezing point in the
coldest hollows. A freeze is not the most likely forecast solution
in our CWA, but given that some of the station-specific MOS guidance
explicitly drops temperatures to near 30, trends in the incoming
higher-resolution forecast guidance will need to be monitored. With
that being said, most of the broader and more populated valley
locales across our CWA will experience at least areas of frost on
Saturday night. The frost will be patchier atop ridges and in places
closer to the mainstem rivers and lakes. Bodies of water
intrinsically hold onto heat for longer, and it remains plausible
for there to be some patchy river valley fog in their immediate
vicinity. This fog would counteract frost formation, so confidence
in frost is lowest in places immediately next to the Kentucky,
Cumberland, Licking, and Levisa/Tug Fork Rivers. Agricultural
interests and recreational gardeners should be prepared to take
protective actions for any sensitive plants in this time frame, and
they are encouraged to continue monitoring for forecast updates and
potential product issuances.
While Saturday and Saturday night remain the coldest part of the
forecast period, there has been a noticeable trend towards slower
airmass modification in next week's forecast guidance. More and more
ensemble members are pinching off a shortwave within the mean
Eastern CONUS troughing on Sunday. That feature spins into a cutoff
upper level low over the Mid-Atlantic in the initial stages of the
next work week. The presence of this feature will block/delay the
eastward propagation of a mid/upper level ridge in the Ozarks,
which, in turn, will prevent temperatures from quickly rebounding
into the 70s in our forecast area. Rather, temperatures will
gradually rise towards afternoon highs in the 60s on Sunday, Monday,
and Tuesday. Some patchy frost is possible in the favored hollows at
night, but the overarching warming trend (albeit slower) will
eventually favor lows in the 40s and valley fog. With fair skies in
the forecast, Eastern Kentucky should get to enjoy a prolonged
period of quiet autumnal weather early next week.
The forecast becomes more uncertain for Wednesday and beyond. There
are diverging model solutions surrounding that low pressure system's
evolution, with some guidance even suggesting a potential hybrid
tropical cyclone along the east coast. Others take the low out to
sea, which would allow the building southern CONUS ridge to exert
more influence over the Ohio River Valley. It is difficult to
pinpoint specific temperature forecast details towards the end of
the period as a result, but both camps favor dry weather in the
region. The CPC Days 6-10 and Days 8-14 Outlooks resolve a 40-60%
chance of below-normal precipitation in Eastern Kentucky, and
climatologically speaking, this is already the driest time of the
year here. D0 "Abnormally Dry" conditions were expanded across
portions of the commonwealth in today's Drought Monitor update.
Expect these contours to be maintained or perhaps even expand as
this dry pattern sets up and potentially persist through the end of
the month. Fire weather interests are encouraged to monitor for
future updates on that topic as the time approaches.
&&
.AVIATION...(For the 00Z TAFS through 00Z Friday evening)
ISSUED AT 730 PM EDT THU OCT 15 2026
A warm front will continue moving northeast along and west of the
Cumberland Plateau escarpment this evening, with a few showers
and thunderstorms possible over the next couple of hours generally
along and north of the Interstate 64 corridor. As shower and
thunderstorm activity retreats north of the area by ~03z,
southwesterly low-level winds and resulting LLWS will then
develop briefly across the area as a strong cold front approaches
from the west. LLWS is most likely for sites north and west of
JKL, as the low-level jet will be weakening as it moves east across
the area overnight.
Southwest winds will become more westerly and then northwesterly
as the cold front crosses the area during the daytime hours Friday,
with wind gusts near 20 kts possible at most if not all TAF sites
through much of the daytime period. The cold front will bring the
return of MVFR and lower conditions along with the chance for
-SHRA.
&&
.JKL WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
SHORT TERM...JP
LONG TERM...MARCUS
AVIATION...CMC
Source:
JKL issues Area Forecast Discussion (AFD) at Oct 15, 7:31 PM EDT---------------
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