000
FXUS62 KFFC 270522
AFDFFC

Area Forecast Discussion
National Weather Service Peachtree City GA
122 AM EDT Fri Apr 27 2018



.UPDATE...
Updated for the 06Z Aviation Discussion.

&&

.PREV DISCUSSION... /Issued 1005 PM EDT Thu Apr 26 2018/

Update...
Have tweaked the pops for the rest of the night. Looks like
mostly showers for the night with only an isolated thunderstorm.
Have added patchy fog to the forecast.

41

SHORT TERM /Tonight through Friday Night/...

Closed upper low over northeast Mississippi/northwest Alabama
expected to slowly open up and lift east/northeast overnight.
Instability has remained very limited ahead of the system with
minimal deeper convection associated with the initial band of
showers pushing east across the forecast area this afternoon. Seeing
some better convection beginning to develop across northern Alabama
with the cold pool of air in the mid-levels associated with upper
low. Still see enough instability with this feature for at least a
slight chance of thunderstorms across the north into the evening.
Will also keep slight chance of thunder with the initial line of
convection as some warming has occurred ahead of the system. Although
severe thunderstorm chances are marginal, enough shear and steeping
lapse rates will keep that risk going into the evening as well.

Main upper low/short wave exits by sunrise Friday. Secondary short
wave dropping southeast in the northwest flow behind the exiting low
does not appear to have enough moisture to work with for anything
more than some lingering clouds through the day Friday.

20

LONG TERM /Saturday through Thursday/...

Deep longwave trough covering much of the eastern CONUS will drive a
reinforcing shot of cooler/drier air across north and central GA
Saturday into Sunday. Blustery conditions will develop on Saturday
with gusty NW winds but it will remain dry.

Normals for this time of year (in ATL) are 75/54... expect temps to
be about 5-10F degrees cooler over the weekend and into Monday,
before upper level trough moves far enough off the east coast. By
Tuesday, through the middle of next week, dry conditions will
prevail but temps will warm in response to low lvl winds becoming
more southerly and a building upr lvl ridge. This upr ridge that is
expected to extend from the Gulf of Mexico up the Mid Atlantic,
should hold strong through the end of the work week... keeping any
weather systems away from the Georgia area.

DJN.83


&&

.AVIATION...
06Z Update...
Patchy dense ground fog will continue to develop across the
forecast area through 12Z bringing patchy LIFR conditions due to
vsbys and cigs. As northwest winds slowly increase in speed over
the next several hours, the fog will slowly dissipate toward 12Z.
Stratus/Fog will dissipate rapidly after sunrise with mixing. VFR
conditions all areas by 15-18Z and continue through the remainder
of the forecast. Winds will be northwest 5 to 10kts.

//ATL Confidence...06Z Update...
Low to medium on cigs/vsbys through 15Z.
High on remaining elements.


17

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          73  50  75  48 /   5   0   0   0
Atlanta         71  51  73  49 /   0   0   0   0
Blairsville     66  44  68  40 /   5   0   5   5
Cartersville    72  49  73  45 /   0   0   5   0
Columbus        75  51  78  53 /   5   0   0   0
Gainesville     70  49  72  47 /   0   0   0   0
Macon           74  50  78  51 /   0   0   0   0
Rome            72  48  74  45 /   0   0   5   0
Peachtree City  73  49  75  47 /   0   0   0   0
Vidalia         76  54  78  56 /   0   0   0   0

&&

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

$$

SHORT TERM...17
LONG TERM....31
AVIATION...17