JKL issues Area Forecast Discussion (AFD) at Jul 6, 4:55 AM EDT189
FXUS63 KJKL 060855
AFDJKL
AREA FORECAST DISCUSSION
National Weather Service Jackson KY
455 AM EDT Sat Jul 6 2024
.KEY MESSAGES...
- Somewhat cooler and less humid weather arrives behind a cold
front today.
- Seasonably hot and rain-free weather follows for Sunday before a
humid and unsettled weather pattern develops for the new work
week.
- We will also be watching the course of Beryl's remains later in
the week for possible impacts here in eastern Kentucky.
&&
.SHORT TERM...(Today through Sunday)
Issued at 455 AM EDT SAT JUL 6 2024
08Z sfc analysis shows a cold front dropping through the eastern
parts of Kentucky. This has mostly shunted the convection off to
the southeast of the state with just some clouds left behind.
These clouds have so far been enough to limit the fog formation
overnight, but as they clear out into dawn do expect a bit more
fog development. Otherwise, temperatures are running in the lower
70s most places with dewpoints in the upper 60s to low 70s, amid
light winds.
The models, and their individual ensemble suites, are still in
pretty good agreement aloft through the short term portion of the
forecast. They all depict general troughiness to the northwest of
the area with ridging off to the southeast through Sunday. Benign
southwest mid level flow with only limited energy holds forth
over the southern Ohio Valley during this time but looking ahead
this stable pattern aloft may help to provide a glide path for
the remnants of Beryl to impact the area later in the week. The
model spread through the short term is still fairly small so the
NBM was used as the starting point for the grids through Sunday
afternoon with little deviation needed aside from the addition of
more terrain details for hourly and low temperatures tonight.
Sensible weather features a quiet, dry, and somewhat more
comfortable day in the wake of a cold front exiting the area just
after dawn. This will set the stage for a decent ridge to valley
temperature split after dark and through the night. In addition,
valley fog is anticipated with locally dense patches a good bet.
Sunday will see more heat and humidity move back into the area as
the post frontal high pressure starts to move off to the northeast
allowing return flow warmth and humidity to reenter this part of
the state.
The main changes to the NBM starting point consisted of adjusting
the temperatures in order to better reflect more terrain details
tonight. PoPs were minimal from the NBM and were basically kept
that way through the period.
.LONG TERM...(Sunday night through Friday)
Issued at 409 AM EDT SAT JUL 6 2024
Surface high pressure will continue to remain in place overhead to
start the period but with the approach of an upper-level trough,
flow turns southwesterly allowing for influx of moisture. As a
result, temperatures on Monday are forecast to the warmest of the
period as highs are forecast to be in the low to mid-90s. This
coupled with warm, moist southwesterly flow, heat indices will be
approaching 100 degrees to over 100 in isolated locations.
Models continue to remain in agreement with a positively tilted
trough approaching the area. At the surface, a surface low will be
tracking through the Upper Great Lakes. Along and ahead of the
front, increasing showers and thunderstorms are likely. As the low
tracks through the Great Lakes, the front will dive southeast
through the CWA. Forecast soundings, sampled ahead of the front show
a marginally severe atmosphere. Can't rule out a severe storm or two
but overall, pre-FROPA environment appears to be a poor supportive
environment for severe storms. As the surface low ejects northeast,
the surface boundary will extend southwest toward the Ozark Plateau.
This will set the stage for the remnants of Hurricane Beryl to ride
along the boundary and into the forecast area for the end of the
forecast period.
Overall, the period will with a break from the showers and storms
but moving into next week, periods of showers and thunderstorms will
bring much needed rain to the area. However, temperatures will
continue to hang around climatological ranges as daytime highs in
the mid-80s to low-90s and overnight lows ranging from the upper-50s
to upper-60s.
&&
.AVIATION...(For the 06Z TAFS through 06Z Saturday night)
ISSUED AT 215 AM EDT SAT JUL 6 2024
A cold front crosses the region overnight ending chances for
showers by dawn. Winds will average 5 kts or less from the west
to northwest for the balance of the period behind the cold front.
Fog will also become a concern in the through 13Z when at IFR and
MVFR reductions will be possible at all TAF sites, but most
prevalent in the valleys. Given some drier air advecting into the
region during the rest of the night, was not especially confident
in putting the fog as prevailing, but did continue the use of some
TEMPO groups for it. Residual cloud cover may also inhibit fog
formation somewhat during this time frame, as well. SKC conditions
follow through the rest of the period from mid morning on.
&&
.JKL WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
SHORT TERM...GREIF
LONG TERM...VORST
AVIATION...CMC/GREIF
Source:
JKL issues Area Forecast Discussion (AFD) at Jul 6, 4:55 AM EDT---------------
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