-- Discussion containing changed information from previous version are highlighted. --
722
FXUS61 KILN 201801
AFDILN

AREA FORECAST DISCUSSION
National Weather Service Wilmington OH
201 PM EDT Thu Jun 20 2024

.SYNOPSIS...
Hot and humid conditions will continue through Sunday until a
cold front moves through the region, bringing brief relief from
the heat. Slightly cooler air settles in Monday before warmer
and more humid air quickly returns by midweek once again.
Although a stray shower or storm cannot be ruled out just about
any day through Sunday, the most widespread chances for storms
through the next week look to be Sunday and next Wednesday.

&&

.NEAR TERM /UNTIL 7 PM THIS EVENING/...
Starting to see some cu development. There will be the potential
for some isolated to scattered showers and thunderstorms this
afternoon with daytime heating. Another hot and humid day is in
store with heat index values expected around 100. Continued the
heat advisory due to the expected heat.

&&

.SHORT TERM /7 PM THIS EVENING THROUGH 6 PM FRIDAY/...
More of the same is on tap tonight -- warm and muggy conditions
with lows bottoming out in the lower 70s. Friday will be a near
carbon copy of today`s weather, except perhaps another few
degrees warmer (but with dewpoints a few degrees lower).
Anticipate that highs will top out in the mid 90s Friday, with
afternoon dewpoints generally in the mid to upper 60s, yielding
heat index values just a 2-3 degrees above actual air temps.

Although a very ISO SHRA/TSRA cannot be ruled out Friday,
especially in central OH, most areas again remain dry.

&&

.LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/...
The 700H- 500H ridge continues to retrograde back through the
Tennessee Valley region, with the ILN CWA comfortably seated near
the center of the high. Consequentially, Saturday will be one of the
hottest days of the ongoing heatwave, with high temperatures in the
upper 90s and dew points in the upper 60s/low 70s. This results in
"feels like" temperatures around 100F for most areas but especially
in our metro areas, continuing to remain in advisory level criteria.
With that being said, Saturday marks day 6 of the prolonged heat
(Heat Advisory products came out on Monday, 6/17). Consequentially,
the Heat Risk category remains "Extreme" for much of our area. Visit
wpc.ncep.noaa/gov/heatrisk/ for details on the Extreme Heat Risk
category. Unfortunately, not much relief Saturday night into Sunday
with overnight lows only falling to the upper 70s.

Sunday, a shortwave moving through the Great Lakes region will bring
a cold front through our area Sunday afternoon and evening. Showers
and storms will be forced out ahead of the frontal boundary. Right
now, CSU severe highlights all of the region with a low end severe
probability. This is likely due to the ample CAPE (and DCAPE) that
will be in place with some shear aloft, given the 850mb jet. Will be
something to keep an eye on as we get nearer. Highs on Sunday reach
the low 90s with overnight lows into Monday fall to the upper 60s.

In the relatively cooler post-frontal air, Monday will be a slight
respite from the heat, with highs in the upper 80s. While this
doesn`t sound like much, we might actually notice a difference,
given the surge of dry air that moves into the region behind the
front. In fact, dew points drop from the low 70s into the upper 50s.
Overnight low temperatures in the mid 60s.

This is all short lived, as we quickly rebound with return southerly
flow on Tuesday ahead of the next system poised to move into the
region and highs bounce back into the low 90s. We`ll continue to
keep an eye on this mid week wave as it looks to impact the region
sometime around Wed/Thur next week. Still a bit far out for details,
but ECMWF, CMC, and GFS ensembles all hone in on a notable negative
height anomaly moving through the Great Lakes region mid to end of
next week.

&&

.AVIATION /18Z THURSDAY THROUGH TUESDAY/...
-- Changed Discussion --
Cu has developed. There will be the potential for some
thunderstorms this afternoon and evening with daytime heating.
Have this mentioned limited to VCTS at KILN and VCSH at KCMH and
KLCK. Overnight have some vsby reductions with fog at KLUK,
KILN, KCMH, and KLCK.  Additional cu are expected tomorrow.

OUTLOOK...Thunderstorms possible on Sunday.
-- End Changed Discussion --

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...Heat Advisory until 8 PM EDT Saturday for OHZ026-034-035-
     042>046-051>056-060>065-070>074-077>082-088.
KY...Heat Advisory until 8 PM EDT Saturday for KYZ089>100.
IN...Heat Advisory until 8 PM EDT Saturday for INZ050-058-059-066-
     073>075-080.

&&

$$
SYNOPSIS...KC
NEAR TERM...
SHORT TERM...KC
LONG TERM...CA
AVIATION...