Area Forecast Discussion
Issued by NWS Paducah, KY

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FXUS63 KPAH 220352
AFDPAH

Area Forecast Discussion
National Weather Service Paducah KY
1052 PM CDT THU APR 21 2016

.SHORT TERM...(Tonight through Saturday night)
Issued at 210 PM CDT Thu Apr 21 2016

Precipitation lingered in the eastern portions of the area
(Pennyrile region of west KY/parts of southwest IN) all morning.
Some additional development occurred back to the west of that
activity from near Paducah to Evansville up to Pike County IN. By
early afternoon, some isolated convection started flaring up over
S. IL. Hardly any lightning with any of this activity but hail may
occur.

The upper level low, clearly seen in water vapor loop over central
Iowa this morning, moved into southern IA/northern MO this
afternoon. This low will move into western IL by 00Z this evening
and into central IL later tonight. As this occurs...we will continue
to see the chances for showers and some thunderstorms through
tonight, as the main trough pivots over our region and better
moisture becomes available. Freezing levels are pretty low, so
some of the storms could produce some hail. Looking at the latest
suite of models...it is still difficult to pinpoint where
convection may set up, but the consensus appears to be that
southern IL, southwest IN and parts of SEMO have the best chances
to see additional development this afternoon into the evening
hours.

Models have become a little more persistent on lingering
precipitation in the our eastern sections (southeast IL, southwest
IN and the northern Pennyrile of western KY) later tonight (after
midnight) and even into Friday...as lingering moisture interacts
with the departing upper low to produce some showers. This is in
line with previous thinking so just minor adjustments will be
needed to POPs over the next 24 hours.

The effects of this upper low will finally get out of the region
Friday night. Then we can focus on another nice spring weekend,
which promises to be dry and warm. Although it will be rather cool
to start out the day on Saturday, as Friday nights lows will be in
the upper 40s across the north with lower 50s in the south.

.LONG TERM...(Sunday through Thursday)
Issued at 210 PM CDT Thu Apr 21 2016

A weak upper level ridge will move east by Monday providing a
southwest flow regime as one upper level low over the Dakotas
dissipates and another develops over the southern Rockies. This
moist flow will provide ample opportunities for showers and
thunderstorms for most of next week across the area.

At the surface, a weak front will lie east to west over the CWA by
late Tuesday. This is expected to move north as a warm front on
Wednesday. After that the models diverge slightly with the GFS
pushing a front through the area on Thursday. The ECMWF and GEFS
prefer to hang the front up either over our cwa or just to the
north.

All this means is that an unsettled, wet week is expected.

SPC has a small portion of the northwest edge of our CWA outlooked
for next Thursday. This looks pretty good as jet dynamics will be
strongest in that area ahead of a surface low lifting out of the
southern plains. Surface or elevated instability is forecast to be
over the area from Tuesday on. Any severe looks to be more isolated
in nature for us.

The Ensemble SA Tables suggest the heaviest rains will be Wednesday
and Thursday. However, any thunderstorm could produce locally heavy
rain next week.

&&

.AVIATION...
Issued at 1052 PM CDT Thu Apr 21 2016

Showers and isolated storms will eventually push east of the
terminals with KCGI now in the clear. Overnight, just some sct VFR
deck clouds 5-10k/ft. Light west winds. NW winds Friday may gust 15-
20 kts in the afternoon, with some sct-bkn mainly VFR clouds just
above 3k/ft, primarily KEVV and KOWB. Should clear out tomorrow
evening.

&&

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

$$

SHORT TERM...CW
LONG TERM...PS



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