Area Forecast Discussion
Issued by NWS Atlanta, GA

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FXUS62 KFFC 211905
AFDFFC

Area Forecast Discussion
National Weather Service Peachtree City GA
305 PM EDT Mon Aug 21 2017

.SHORT TERM /Tonight through Tuesday Night/...
Weak upper ridging persists this afternoon across the region,
however deepening moisture has resulted a slightly better coverage
of convection. Still generally isolated coverage expected this
afternoon into the early evening, scattered in the southeast corner
where sea breeze front is aiding lift and moisture is a bit richer.
With a lack of any focusing mechanism outside of the sea breeze, any
convection that manages to develop should diminish quickly this
evening. Should see a bit more coverage tomorrow afternoon and
evening as the upper ridge breaks down and moisture continues to
increase. Convection diminishes tomorrow evening, but approaching
cold front brings POPs back up between midnight and sunrise across
the north. Lapse rates and instability not impressive through the
period and any thunderstorms that develop should remain below severe
limits.

20

.LONG TERM /Wednesday through Monday/...
Only tweaks to the long term based on the latest guidance.
Majors differences between the GFS and European continue
after Wednesday.

BDL

PREVIOUS DISCUSSION...
Models in general agreement with the eastern trough deepening
through the week. This will push a cold front across the CWA
Wednesday and becoming stationary across south Georgia for the
remainder of the week. Models differ in the moisture patterns with
the GFS keeping deep moisture over much of the CWA while the ECMWF
is much drier. Have gone with a compromise going with low pops
through the end of the week and into next weekend. Temps will
remain pretty close to seasonal norms.

17

&&

.AVIATION...
18Z Update...

VFR conditions are expected to predominate across the forecast area
through the majority of this forecast period. Isolated convection
this afternoon should remain sparse enough to keep out of the TAFs
unless one happens to threaten the vicinity of a site. Scattered to
briefly broken cumulus clouds 4-6kft 18-21Z. Will see isolated to
scattered areas of MVFR or lower visibilities between 06Z and 14Z.
only looking at some brief impacts possible at any of the TAF sites,
mainly KMCN & KAHN. East to southeast winds 4-8kt will diminish by
00Z to 5kt or less. Winds shift to southwest 12-14Z.

//ATL Confidence...18Z Update...

High.

20

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          72  90  73  91 /  20  30  20  50
Atlanta         75  89  75  90 /  20  30  20  50
Blairsville     67  85  68  83 /  20  30  30  60
Cartersville    71  91  72  89 /  20  30  30  60
Columbus        76  92  76  93 /  20  30  20  50
Gainesville     73  89  73  88 /  20  30  20  50
Macon           72  90  74  93 /  20  30  20  50
Rome            72  92  72  89 /  20  30  30  60
Peachtree City  71  91  72  90 /  20  30  20  50
Vidalia         74  92  75  93 /  20  40  30  40

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

SHORT TERM...20
LONG TERM....BDL
AVIATION...20


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