Area Forecast Discussion
Issued by NWS Paducah, KY

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000
FXUS63 KPAH 222328
AFDPAH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PADUCAH KY
628 PM CDT SAT AUG 22 2015

.UPDATE...
Updated aviation section for 00z taf issuance

&&

.SHORT TERM...(This evening through Monday)
Issued at 222 PM CDT SAT AUG 22 2015

Upper level trof continues to slowly move east across the middle
Mississippi/lower Ohio River valleys this afternoon. Scattered
showers/thunderstorms have broken out in association with this
feature and the heat of the day. These showers will try to move
east across the MS River early this evening...but coverage will
likely decrease as we lose low lvl heating.

Cold front still expected to approach the region late
tonight/early Sunday. Decent instability is progged to form ahead
the the front by late morning/early afternoon along/ahead of the
front over se IL/wrn KY/sw IN. SB CAPES could be running up around
3000 J/KG by 18z. Limiting factor for organized severe threat may
end up being the relatively weak wind profiles. SFC-6KM bulk shear
only progged to be running in the 25-30 kt range. Mid lvl support
should also be weak. However, cannot rule out some isolated
marginal severe if enough instability can be generated. Scattered
storms will move east of the region by late in the day as the
front departs. Much drier and unseasonably cool conditions will
then filter in behind the front Monday and Monday night as high
pressure pushes se through the Plains.

.LONG TERM...(Monday night through Saturday)
Issued at 222 PM CDT SAT AUG 22 2015

Under a highly amplified flow pattern aloft, high sfc pressure will
dominate across the midsection of the country for most of the
extended period. Nnwrly flow aloft will persist over the PAH
forecast area, tending to keep deep layer cool dry Canadian air
flowing into our region.

Late next week, the med range models are in good agreement that the
mid/upper pattern will begin to deamplify as substantial shrtwv
energy moves into srn Canada and the Great Lakes region. This will
result in a weak flow pattern to the east of the persistent swrn
CONUS ridge aloft, and thus over our region. By Sat (Day 7), as
deeper moisture increases somewhat, an isold shower or tstm appear
possible during the heat of the day in nwrn parts of our region near
mid level shrtwv energy (and possibly a sfc reflection?) on the ern
periphery of the swrn CONUS ridge. Otherwise a rain-free mostly
clear forecast is in play.

Expect pleasant weather, with below average temps through the
extended period, and a slow warming trend.

&&

.AVIATION...
Issued at 628 PM CDT SAT AUG 22 2015

Clusters of thunderstorms in the kcgi/kpah area will move northeast
and gradually dissipate this evening. The kevv/kowb terminals will
be kept dry this evening, but extensive mid and high level
cloudiness will move across those sites.

Areas of fog appear likely to form late tonight, especially where
rain moistened the ground this afternoon. Some lifr conditions are
likely at kcgi, and kpah may also be lifr at times around sunrise.
Lower dew points and lack of recent rain at kevv/kowb suggest only
mvfr vsbys there.

Widespread cumulus cloudiness will develop Sunday morning and last
through the day. Cigs will gradually increase during the day, but
they may be mvfr in the morning. Winds will shift into the west to
northwest in the afternoon as a cold front passes.

&&

.PAH WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
MO...NONE.
IN...NONE.
KY...NONE.
&&

$$

SHORT TERM...MEFFERT
LONG TERM...DB
AVIATION...MY



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