JKL issues Area Forecast Discussion (AFD) at Jul 12, 9:53 PM EDT979
FXUS63 KJKL 130153
AFDJKL
AREA FORECAST DISCUSSION
National Weather Service Jackson KY
953 PM EDT Fri Jul 12 2024
.KEY MESSAGES...
- Hotter conditions make a comeback as we move into the weekend
and for next week.
- The next significant chance of rain will hold off until the
middle of next week.
&&
.UPDATE...
Issued at 953 PM EDT FRI JUL 12 2024
We have had some persistent showers and occasional thunderstorms
that have been forming along and ahead of an eastward advancing
outflow boundary. Given this updated to keep PoPs going for a
small portion of the areas mainly along and north of the Mountain
Parkway this evening. Some of these showers are producing brief
heavy rainfall of three quarters of an inch to one inch an hour
rates at times. Other than the PoPs no bigger changes are needed
for this update.
UPDATE Issued at 713 PM EDT FRI JUL 12 2024
We have had a few more showers that have develop further east
than expected. This could perhaps be an additional outflow
boundary that was undiagnosed. Either way opted to add in 15 or
less PoP in areawide for a few hours this evening. Outside this
only minor update to add in the latest obs and trends.
UPDATE Issued at 551 PM EDT FRI JUL 12 2024
A weak wave is noted in the mid-levels toward SE Missouri. This
has helped sparked off showers and a few thunderstorms across
western and central parts of Kentucky this afternoon. An outflow
off these storms is noted on satellite and WSR-88D data this
afternoon tracking slowly east toward parts of eastern Kentucky.
This has been aiding is developing a few showers and
thunderstorms at times as it tracks east. Given this opted to
keep 15 or less PoP right along our CWA border through the late
afternoon hours. These are expected to relent through the evening,
but HRRR (which has been verifying the best lately) has this
going a little longer into the evening. This trend will be
monitored for future updates. Outside this is a fairly minor
update.
&&
.SHORT TERM...(This evening through Saturday night)
Issued at 312 PM EDT FRI JUL 12 2024
The 15Z surface analysis continues to show high pressure situated
over much of the eastern CONUS. A weak surface low remains present
over the Central Plains with a surface boundary extending into the
Ohio Valley. In eastern Kentucky, high pressure remains dominate
with mostly sunny skies. Radar has been a little active over the
last hour or so with pop-up showers developing along and southwest
of the Mountain Parkway. These showers pulse up quickly then
dissipate. Isolated showers will be possible over the next few hours
before diminishing after sunset.
Aloft, a trough continues to be situated over the Great Lakes. The
CWA is presently situated at the base of the trough as it continues
to pivot northeastward out of the area. This trough is helping
trigger the shower activity across the area today but as the trough
exits and daytime heating wanes, those showers will cease to exist.
For the overnight, mostly clear skies will exist and allow for
radiational cooling in the river valleys. Thus allowing for the
development of areas of valley fog through the early morning hours
of Saturday.
Saturday brings about another hot and humid day as surface high
pressure remains overhead. Aloft, west to northwesterly flow will
usher in a drier airmass thus limiting the potential for shower
activity but cannot rule out a stray shower Saturday afternoon.
Overnight Saturday brings around another mostly clear night with
areas of valley fog that'll burn of early Sunday morning.
Overall, the period will be mostly dry aside from a few isolated
showers or storms with passing clouds. Highs are forecast to be in
the mid to upper-80s into the lower-90s today before climbing into
low to mid-90s for Saturday. Overnight lows will remain mild across
the area too, as lows tonight will drop into the mid to upper-60s
for tonight and again Saturday night.
.LONG TERM...(Sunday through Friday)
Issued at 432 PM EDT FRI JUL 12 2024
There is reasonable agreement among models up until about mid week.
We should reside near the southern edge of the westerlies aloft on
Sunday. Our surface air mass is expected to modify to dew points in
the 65-70 range by then, with strong sun pushing highs to about 90
or a little warmer. The resulting forecast soundings show ample
instability. The question is whether or not there will be any
feature on which convection can focus. Being at the southern edge of
the westerlies aloft could provide something (perhaps a MCS
remnant), and a 20% POP was used. After this, the faster flow aloft
retreats to our north and northeast, and with this a dry forecast
was used for Monday. However, heat will remain.
After this, a large scale upper trough will be dropping southeast
out of Canada toward the Great Lakes and Ohio Valley. It will result
in geopotential height falls over our region for Tuesday, and
increasing mid/upper level flow by Wednesday along with further
height falls. The trough will also support a cold front which is
expected to approach Tuesday night and reach KY on Wednesday. Low
level flow ahead of the front will bring higher dew points off the
gulf into our area. The approaching upper level trough and
increasing dew points may allow for a few showers/thunderstorms on
Tuesday and Tuesday night. However, the highest POP looks like
Wednesday as the front arrives, and likely category was used area
wide.
Model agreement drops off after this point with regard to frontal
progression. The 12Z run of the GFS takes the front far enough to
our south to allow for dry weather here on Thursday and Thursday
night. The ECMWF is slower, with precip lingering longer, especially
in our southeast counties. A model blend being used will take the
differences into account in its averaging.
&&
.AVIATION...(For the 00Z TAFS through 00Z Saturday evening)
ISSUED AT 1905 PM EDT FRI JUL 12 2024
We are seeing VFR conditions prevail over the TAF sites to begin
the period. The guidance continues to be bold with the fog
development tonight at some of the TAF sites, but not sure how
extensive this will be given the previous nights have been lack
luster. We are see more low to mid-level clouds than we saw
yesterday which would lead to less fog concerns. The one issue
would be any showers that can develop this afternoon could cause
more localized issues outside of the typical river valley fog.
Given this will lean toward mainly MVFR fog at SME/LOZ/SYM late
tonight between 8Z and 10Z. This will lift around 13Z to 14Z
Saturday morning. Then we will see VFR conditions prevail through
the remainder of the TAF period. The winds will remain light and
variable through the period.
&&
.JKL WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
UPDATE...DJ
SHORT TERM...VORST
LONG TERM...HAL
AVIATION...DJ
Source:
JKL issues Area Forecast Discussion (AFD) at Jul 12, 9:53 PM EDT---------------
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