075
FXUS61 KILN 041724
AFDILN

Area Forecast Discussion
National Weather Service Wilmington OH
124 PM EDT Wed Jun 4 2025

.SYNOPSIS...
Influence of surface high pressure weakens through the day as a slow
moving cold front approaches from the west. Dry conditions are still
expected through the daylight hours before shower and storm activity
increase tonight. Episodic showers and thunderstorms continue
through Friday before the cold front pushes south of the Ohio River,
decreasing coverage of rain through the start of the weekend.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Mid and upper level ridge axis to remain centered along the Eastern
Seaboard with a broad southwesterly flow across our region. Embedded
shortwave pivots thru the Great Lakes into southern Canada today.
Slow moving surface front that is draped across Lower MI, IL, and MO
nudges a little east into far northwest Ohio this evening.

Conditions continue to favor a dry forecast through the daylight
hours based on latest guidance. Can not rule out a few isolated cells
into our far northwest counties late in day but have generally made
a slight adjustment slower with pops.

Pressure gradient tightens ahead of the cold front which will result
in breezy conditions today - with gusts up to 25 to 30 mph at times.
Highs are expected to reach the middle to upper 80s across the area,
which will be the warmest day of the week. Skies are still expected
to be opaque at times due to the Canadian wildfire smoke aloft.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/...
Mild overnight lows expected as a warm air mass remains intact and a
fair mix of clouds will be in place, which will reduce outgoing
longwave radiation. A few locations may not even drop below the 70
degree mark.

Shower/storm chances still remain pretty limited in our CWA during
the overnight hours. Most favorable area would be NW of I-71
corridor. Activity expected to increase during the daytime on
Thursday with the eastward progression of the frontal boundary, which
will begin to move through our CWA late in the day. Marginal to
moderate instability expected to develop during the daytime, with
some locations reaching 1000-1500 J/kg of SBCAPE. With wind shear
values being very weak, organized convection is not expected. We will
primarily be looking at a downburst threat from cellular storms.
However, overall severe potential will be very low given the lack of
robust DCAPE values and poor mid-level lapse rates, limiting updraft
growth and potential for precip loading and/or large hail.
Additionally, flood risk will also be very limited, but certainly
could have an isolated instance of slow-moving storms hitting the
same area multiple times in a short time-span, which could result in
localized hydro issues.

&&

.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
Mid level flow will be nearly zonal for the start of the period with
a rather moist airmass in place. Thus, showers and thunderstorms
that continue into Thursday evening may linger across parts of the
area even through the overnight, although thunder coverage will
decrease greatly heading into the diurnal minimum.

A short wave will emerge out of the central Plains and approach the
region on Friday, moving through on Friday night. This will bring an
increase in showers and thunderstorms heading into the afternoon and
evening, particularly for areas south of I-70. With deep westerly
flow, there will be the potential for corridors of repeated activity
which could produce locally heavy rain. Better deep layer shear may
not move into the area until instability is on the wane, but there
could be a window late in the day when there is sufficient
juxtaposition to allow for a few strong to severe cells.

A weak surface low will move through the area in association with
the short wave. A trailing cold front will then slide through the
area, although guidance trends are for this boundary to not get very
far south. Thus there will still be a chance of showers in southern
counties on Saturday as another short wave drops east southeast
through the region.

A closed low will barrel out of the Canadian Plains and into the
Great Lakes for the early part of the week. This will push a weak
cold front across the area on Monday bringing another chance of
showers which could even linger into Tuesday in south central Ohio
and northeast Kentucky.

High temperatures will be near normal through the period with lows
generally a bit above normal.

&&

.AVIATION /17Z WEDNESDAY THROUGH SUNDAY/...
Mid level ridge has shifted to the east of the area placing the
region in a southwest flow regime. Pressure gradient has tightened
with southerly winds gusting up to 25 kts thru the afternoon. VFR
cumulus clouds between 4000 and 5000 feet will result in VFR ceilings
at times.

Cumulus clouds will scatter out and winds will decrease with loss of
daytime heating heading into this evening.

Low confidence on timing and coverage of shower/storm activity
overnight into Thursday morning, as a slow moving cold front will
work its way toward our region from the west. Expect weakening
convection or showers to move int the area toward sunrise and
continue thru about mid morning. Due to uncertainty regarding
placement and timing have limited mention of VCSH or -shra toward
sunrise in the west and by mid morning east with no restriction to
visibility at this time. A better threat for storms develops Thursday
afternoon and have handled this threat with a mention of VCTS in 30
hour KCVG TAF after 21Z.

Generally expect VFR conditions (outside of pcpn) thru the evening into
Thursday. Some of the higher resolution models indicate a brief period
of MVFR ceilings across the northern TAF sites early Thursday. At
this time have kept all sites in the VFR category.

OUTLOOK...Thunderstorms are possible Thursday through Friday.
MVFR/IFR ceilings are possible Thursday night and again Friday night
into Saturday.

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...None.
KY...None.
IN...None.

&&

$$

SYNOPSIS...Clark
NEAR TERM...AR
SHORT TERM...Clark
LONG TERM...
AVIATION...AR