Area Forecast Discussion
Issued by NWS Paducah, KY

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FXUS63 KPAH 021147 AAA
AFDPAH

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PADUCAH KY
647 AM CDT Tue Sep 2 2014

.UPDATE...
Issued at 647 AM CDT TUE SEP 2 2014

Updated the aviation discussion for the 12Z TAF issuance.

&&

.SHORT TERM...(Today through Thursday)
Issued at 336 AM CDT TUE SEP 2 2014

A frontal boundary approaching the region from the plains this
morning is forecast to drop into our CWA today, become
quasi-stationary from E-W across the CWA tonight, then lift back to
the northeast as a warm front on Wednesday.

As a result, shower and thunderstorm coverage will increase from the
west this morning, then taper off from the west this afternoon as
the deeper moisture shifts to the east. In the meantime, with
precipitable water values remaining high (>=2 inches), locally heavy
rainfall is expected with the stronger storms today. Per soundings not
much directional shear available, but there is decent speed shear,
so a few storms may become near severe, but no widespread severe
weather is expected.

Late tonight there may be overrunning/warm air advection
precipitation over the southwest sections of our CWA. Wednesday as
the boundary lifts back across the area, precipitation chances
should spread northeast across the entire CWA.

Wednesday night into Thursday our CWA will be in the warm sector
with models showing weak ridging aloft. Feel leaving precipitation
out Wednesday night is a safe bet, but on Thursday with lack of
deep moisture combined with the ridging aloft, an isolated storm
or two could pop up just about anywhere in the heat of the day,
but at this point it is too difficult to pinpoint where, so
decided to leave precipitation out at this time.

Temperatures starting out near normal (low to mid 80s) at the
beginning of the period will warm into the lower 90s by the end of
the period. Unfortunately dew points will remain in the mid 60s to
lower 70s through the period, so no relief in sight from the high
humidity of summer.

.LONG TERM...(Thursday night through Monday)
Issued at 336 AM CDT TUE SEP 2 2014

The PAH forecast area will be under the influence of the weak
anti-cyclonic flow of a mid/upper ridge late in the week. However,
plenty of moisture and instability in the lower trop will make isold
to scattered showers and tstms possible Fri as the ridge aloft
begins to be suppressed by a longwave nrn stream trof sinking into
the central/ern CONUS. As a cold front approaches the region from
the north, pcpn chances will continue to increase Fri night.

In fact, the cold front is progged to enter the nrn half of the
region by then. Highest PoPs will be after 12Z Sat for most of the
region as it appears that most pcpn will be post-frontal. The
GFS/ECMWF ensemble means now seem in better agreement with the
strength and ewd movement of the sfc high sinking swd into the
central CONUS behind the cold front. The operational GEM does not
show the high being as strong, and therefore continues to lag the
cessation of pcpn through Sat night compared to the GFS and ECMWF.
We will leave PoPs in primarily the srn half of the region for now.

Sunday and Mon are expected to be dry and noticeably cooler...with a
drop of around ten degrees compared to Fri, and a nrly to nerly
breeze. Say goodbye to 70s dewpoints for a little while.

&&

.AVIATION...
Issued at 647 AM CDT TUE SEP 2 2014

With the approach of a frontal boundary, showers and thunderstorms
a good bet at all terminals today with IFR/MVFR cigs and/or vsbys.
Cloudiness should diminish this afternoon from west to east. Fog
likely late tonight with LIFR/IFR vsbys at KCGI and MVFR vsbys at
KPAH/KEVV/KOWB. Southerly winds AOB 6 knots today should go calm
after 06Z.

&&

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

$$

SHORT TERM/AVIATION...JP
LONG TERM/FIRE WX...DB






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