Area Forecast Discussion
Issued by NWS Paducah, KY

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FXUS63 KPAH 252338
AFDPAH

Area Forecast Discussion
National Weather Service Paducah KY
638 PM CDT THU AUG 25 2016

.UPDATE...
Issued at 638 PM CDT Thu Aug 25 2016

The AVIATION section has been updated for the 00Z TAF issuance.

&&

.SHORT TERM...(Tonight through Saturday night)
Issued at 218 PM CDT Thu Aug 25 2016

Dry across the CWFA, hot and humid this p.m. with convection along
our southern CWFA boundary into MO bootheel, NE AR and NW TN.
Expect a mainly dry evening overall. After midnight, as moisture
comes around the west side of a mid level high over the SE U.S. we
have a slight chance of convection into our western counties
(SEMO, SRN IL). This in conjunction with a weakening boundary
moving SSE into the area.

The boundary will essentially wash out across the region, with a
subtle uptick in overall moisture on the west side of the
aforementioned high. Therefore some chance PoPs in the forecast
Friday through Saturday night, slightly higher during the
afternoon and early evening. Spatially, slightly higher PoPs NW of
the Ohio vs. west KY. Models still struggling somewhat with the
fine scale details. So am playing the PoPs more in line with
synoptics and best placement of moisture. Temps will be a
persistence forecast blended with MOS.

.LONG TERM...(Sunday through Thursday)
Issued at 218 PM CDT Thu Aug 25 2016

Confidence remains on the low side with the extended due to model
discrepancy.

In contrast models do agree on upper level ridging dominating the
extended. The GFS indicates a very dirty 500mb ridge...while the
ECMWF has much cleaner and climatological scenario. Not necessarily
the correct one but neater just the same. Will definitely focus
storm chances in a diurnal or maximum heating trend...as the ECMWF
would suggest. This will depend heavily on collaboration and the
extended init of course. Sunday appears to be the best chance for
diurnal storms as the upper level ridge drifts eastward to the
Atlantic coast before retrograding back west through the week.
In the afternoon hours will be our best chances as surface
instability is favorable for storm development. surface based
CAPE`s are topping out around 2k j/kg/2 and surface based LI` well
into the negatives. Elevated index values are border line but
favorable for mainly afternoon storms. Finally toward the end of
next week...if the ridging truly moves west it will force the
tropical disturbance to take a more easterly route as the ECMWF is
currently advertising.

As for temperatures highs will be slightly above normal or around 90
with lows about nearly 10 degrees above normal or around 70. Dew
points will average 70 to 75. So the muggy conditions are expected
to prevail.

&&

.AVIATION...
Issued at 638 PM CDT Thu Aug 25 2016

A weak frontal boundary will remain north of the area tonight, and
then may flirt with KEVV on Friday. No convection expected this
evening, but there is a rather persistent signal for scattered
convection near KCGI and KPAH just after 12Z. Will cover it with
VCSH for a few hours for now. Wont be surprised if something
arrives a bit earlier. This activity is not expected to reach the
other terminals, and the afternoon is expected to be dry at all
sites. MVFR fog formation overnight seems like a safe bet at all
sites, as winds drop out this evening. Worse conditions will be
possible at KCGI and KPAH, but with lower clouds increasing and
the potential for precipitation, will not get carried away with
more significant fog at this time.

&&

.PAH Watches/Warnings/Advisories...
IL...None.
MO...None.
IN...None.
KY...None.
&&

$$

UPDATE...DRS
AVIATION...DRS


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