Area Forecast Discussion
Issued by NWS Wilmington, OH

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FXUS61 KILN 250608

Area Forecast Discussion
National Weather Service Wilmington OH
208 AM EDT MON JUL 25 2016

A cold front will begin to approach the area overnight and move
through the region on Monday. Hot and humid conditions will be
present in advance of this feature with thunderstorms possible at


25.00Z KILN sounding revealed an moderate/strongly buoyant airmass
with MLCAPE approaching 2000 j/kg amidst PWAT values of 1.8"+.
However, that`s about it in terms of an environment that will
support severe weather. Low/deep layer flows are weak /0-6km bulk
shears ~20kts/ with even weaker 0-3km shears. DCAPE rather
unimpressive as well below 600 j/kg.

Been watching evolution of storm clusters in nern ILL/nwrn IND
which is being forced by tail end of wrn Great Lakes shortwave
trough and attendant cold front. Storms trying their best to
organize amidst very strong instby out there /where widespread
~80F dwpts are observed/ but lack of shear is leading to poor
organization. Think recent 3-4 runs of HRRR have been generally
grasping what will happen...northern portion of the line near
Gary Indiana will surge southeast and weaken as it approaches the
CWA around 05Z. Central ILL cluster/segment will likely have more
staying power due to feed of better theta-e and approaching MCV to
the west...but net propagation will be slowly southeast such that
this segment will likely never reach sern IND...and if it
does...will have gusted out by then with just a threat for
showers/isold storms.

Going forecast for overnight looks good...given anomalous dwpt
field in place bumped up lows a couple of degrees and slowed rain
chances down just a bit in the west/north overnight but overall
forecast in good shape.


Heat and humidity will continue for Monday. Heat index values will
be near 100 again with a better chance for this across southern
portions of the region. Continued the heat advisory and excessive
heat warning across southern portions of the region for Monday.

A cold front will move through on Monday. There has been some
variability with how much convection will develop with this
feature, however given airmass in place believe that preciptiation
chances will be likely across the southern portions of the
forecast area by late in the afternoon and early evening hours. A
few of these storms may reach severe limits with damaging winds
the primary threat.

Boundary will hold up across southern portions of the area and
therefore linger preciptiation chances across the far south
through Tuesday night.  With CAA across the northern portions of
the forecast area on Tuesday believe cu will develop during the
day. Even with the CAA expect high temperatures on Tuesday to be
in the middle to upper 80s.


Stationary frontal boundary looks to be positioned along or just
south of the Ohio River Wednesday. Boundary will divide a very moist
air mass to the south from a relatively drier air mass to the north.
Will continue with chance pops for thunderstorms close to and south
of the front on Wednesday.

Boundary will lift north as a warm front late Wednesday night into
Thursday. This will allow precipitable water values to increase
northward, placing the CWA back in a very moist environment for

Models show a shortwave approaching late Thursday or Thursday night.
Timing is still somewhat in question, but there is decent consensus
on the track which will bring it across the Ohio Valley. Therefore,
begin to increase pops for Thursday afternoon and will continue
chance pops into Thursday night for possible influence from

Additional shortwaves may affect the Ohio Valley Friday through
Saturday. Details associated with the shortwaves (such as
track/timing/strength) are in question and will need to be resolved
with time. But the potential for shortwaves combined with a warm
moist air mass means that chance pops for convection will continue
through at least Saturday. Eventually, a cold front may move through
and this could occur late Saturday into Sunday but confidence is low
on the timing of the frontal passage.

Temperatures are forecast to favor near average to slightly above
average values through the long term.


Cold front lies across Illinois. Thunderstorms that have
developed in the very humid airmass along and ahead of the front
have remained west of TAF sites. Expect a gradual eastward
progression of the convection while storms continue show a
diurnal weakening trend. Leftover showers may reach DAY around
09Z. BR is forecast to reduce visibility at LUK ILN and LCK early
this morning.

All sites may then see thunderstorms develop in the vicinity
starting around 16Z as forcing increases near the approaching
front, while instability rises toward daytime maxima. The chance
for thunderstorms will then persist into evening as the front
makes its way toward the Ohio River. Will issue amendments to
better indicate timing and effects of thunderstorms closer to
their time of occurrence. Look for improving conditions late in
the forecast as instability drops off with loss of daytime
heating. Winds will generally out of the west with speeds close to
10 knots during the afternoon.

OUTLOOK...Thunderstorms possible Thursday.


OH...Heat Advisory until 8 PM EDT this evening for OHZ073-074-
     Excessive Heat Warning until 8 PM EDT this evening for OHZ077.
KY...Heat Advisory until 8 PM EDT this evening for KYZ089>100.
IN...Heat Advisory until 8 PM EDT this evening for INZ075-080.


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