Area Forecast Discussion
Issued by NWS Paducah, KY

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000
FXUS63 KPAH 142328 AAA
AFDPAH

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PADUCAH KY
528 PM CST Sun Dec 14 2014

.UPDATE...
Issued at 528 PM CST SUN DEC 14 2014

Updated the aviation discussion for the 00Z TAF issuance.

&&

.SHORT TERM (Tonight through Tuesday night)...
Issued at 305 PM CST Sun Dec 14 2014

The primary weather feature of interest in the short term is a
strong upper-level low that will move northeast from Kansas
tonight to the Upper Mississippi Valley on Monday night. The
associated cold front will sweep east across our region on Monday
evening. Most of the rain with this system will be associated with
the southerly low level jet, well ahead of the cold front.

As far as the details, this evening will remain dry and mild. The
clearing trend has slowed down near the Mississippi River this
afternoon. However, it should continue to make slow northeast
progress as low-level winds continue to increase. The clearing
will not be long-lived as extensive mid and high cloudiness
overspreads our region from the west later tonight.

The models are in good agreement on the leading edge of the rain,
which should reach the Mississippi River around 12z. The leading
edge should overspread the remainder of the forecast area between
12z and 18z. The heaviest and most concentrated rainfall is expected
with the initial surge of moisture late tonight and Monday
morning. Amounts are forecast to be less than one-half inch. There
may be a few isolated thunderstorms in the afternoon over western
KY. The NAM hourly Bufkit soundings indicate a few hours of
elevated weak instability between 16z and 20z at kpah and khop.

As the front crosses our region Monday night, precipitation will
end from west to east. Winds may be rather gusty behind the front.
NAM and GFS model soundings show a post-frontal mixed layer
containing westerly winds around 25 knots Monday evening.

Tuesday will be breezy and cooler as high pressure builds
southeast from the northern Plains. Temps should remain in the
40s. Any substantial clearing should hold off until late in the
day or Tuesday night. Both NAM and GFS model soundings keep low
clouds in at kpah most of the day Tuesday.

.LONG TERM (Wednesday through Saturday)...
Issued at 305 PM CST Sun Dec 14 2014

Very active period expected throughout the extended portion of the
forecast, but forecast confidence is very low in the impact on our
region.

First of all enjoy Wednesday, as that may be the only sunny day next
week. The medium range models still cannot agree on whether or not
we will have any precipitation Wednesday night into Thursday, let it
alone what type of precipitation it may be. The same can be said for
Friday into Saturday.

There are a lot of moving parts in both of these time periods, and
there is little reason to expect any one model to lock in on a
solution. About all that can be done at this point is to keep PoPs
generally at chance levels through the period and mention the
possibilities for precipitation type.

I would not expect the models to get a clue much more than 48 hours
out, so will just have to be patient and be prepared to adjust to
what eventually does happen. The potential does exist for a portion
of the area to get some tangible snowfall, but I wouldn`t want to
bet on when and where at this point.

&&

.AVIATION...
Issued at 528 PM CST SUN DEC 14 2014

With the approach of a system out of the plains, cigs/vsbys will
generally improve from west to east through 12Z at KCGI/KPAH and
through 17-18Z at KEVV/KOWB, then conditions will worsen back to
MVFR/IFR conditions with the passage of a front and light rain
that will continue through 17-18Z at KCGI/KPAH and through the
entire period at KEVV/KOWB. Southeast to south winds generally AOB
10 knots will continue through the period at KEVV/KOWB, but at
KCGI/KPAH will increase to 10-12 knots with gusts up to 18-20
knots after 17-18Z.

&&

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

$$

SHORT TERM...MY
LONG TERM....DRS
AVIATION...JP






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