Area Forecast Discussion
Issued by NWS Paducah, KY

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000
FXUS63 KPAH 240013
AFDPAH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PADUCAH KY
613 PM CST Tue Dec 23 2014

.UPDATE...
Issued at 607 PM CST TUE DEC 23 2014

For aviation section only.

&&

.SHORT TERM...(Tonight through Thursday night)
Issued at 247 PM CST TUE DEC 23 2014

Medium confidence in Christmas Eve forecast with models still not in
the best agreement, especially where QPF and critical thicknesses
are concerned.

As a sharp H5 trough lifts northeast out of the central plains
tonight, it will induce a surface low/wave on the front and bring
another surge of moisture and increased precipitation chances back
across the region overnight.

The forecast for Christmas Eve is still a bit tricky due to
discrepancies between model QPF, critical thicknesses, and timing.
On Christmas Eve an area of moisture/wrap around precipitation
(deformation zone) will be pulled across the area with the
surface/upper low couplet. In the process, the deeper cold air will
begin to filter into the region mainly in the afternoon, albeit a
tad slower than models were showing yesterday.

The down side to any snow accumulation will be the antecedent
conditions where temperatures are concerned, ie the ground and
roadways are and will be fairly warm at the onset of snow. Long
story short, have light snow amounts over our far western counties
Wednesday morning, then less than an inch generally north and west
of a line from Fairfield Illinois to Greenville Missouri Wednesday
afternoon. As the last of the moisture/wrap around QPF exits the
region Wednesday night, there could be minor snow accumulations
generally north and east of a line from Mount Vernon Illinois to
Calhoun Kentucky.

Unfortunately for those individuals wishing for a white Christmas in
areas other than the ones mentioned above, it`s not looking good for
the home team. Maybe next year.

.LONG TERM...(Friday through Tuesday)
Issued at 247 PM CST TUE DEC 23 2014

High pressure over the southeast U.S. will give us dry conditions
Friday along with southerly winds.  The south winds along with some
sunshine will help temperatures climb into the lower 50s, with lows
Friday night only dropping into the lower 40s.

GFS brings a cold front across the middle Mississippi and lower Ohio
valleys Friday night, while ECMWF is much slower and brings the
front through Saturday night.  The GEM solution is much closer to
the ECMWF solution, so prefer to lean toward the slower passage.
Unfortunately this lends itself to a fairly wet weekend overall.
Surface temperatures and forecast soundings indicate we should
remain all rain Friday night and Saturday.  Based on the slower
frontal passage, colder air will be slower to infiltrate the PAH
forecast area, which will keep rain from mixing with snow as quickly
Saturday night, and the mixed precip should be confined to our
northwest half of counties.  This should keep any snow accumulations
to a couple of tenths at best in these area.

By Sunday, high temperatures are expected to be well above freezing
across most of our counties, so the rain/snow mix should continue to
be confined to portions of southern Illinois and southeast Missouri.
Precipitation will be tapering off Sunday night, and should end as
light snow or a rain/snow mix.  No accumulations are expected.

Dry conditions are expected Monday into Tuesday with a weak surface
high over the central/south central U.S.  Northwest winds will keep
temperatures a little below seasonal normals.

&&

.AVIATION...
Issued at 607 PM CST TUE DEC 23 2014

VFR cigs early this evening should lower int MVFR category as the
night progresses. May even see some cigs aob 1k ft aft 04-06Z as
reain shield increases and possibly causes MVFR vsbys also.

&&

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

$$

UPDATE...GM
SHORT TERM...JP
AVIATION...GM






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