Area Forecast Discussion
Issued by NWS Atlanta, GA

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FXUS62 KFFC 231923

Area Forecast Discussion
National Weather Service Peachtree City GA
223 PM EST Thu Nov 23 2017

.SHORT TERM /Tonight through Friday Night/...
Very pleasant Thanksgiving afternoon across north and central
Georgia, with just a few clouds drifting across the area.
Temperatures are running about 5 degrees cooler than this time
yesterday, largely due to influence of upr trough and northeasterly
flow advecting low lvl cooler/drier air across the forecast area.

Broad area of low pressure moving across central Florida is
responsible for the thicker cloud-cover across much of southeast
Georgia. Outside of some spotty drizzle or very light rain across
parts of our far southeast counties (Telfair to Emanuel county) this
afternoon, dry conditions prevail and will persist into this weekend.

Light winds, clearing skies and dry conditions will result in chilly
conditions overnight. Expect widespread 30s with some lower 40s
extreme southern counties. Temps rebound a few degrees on Friday
(and Friday night) as low lvl winds shift around to west-southwest
and slightly higher dewpts move back across the area.

A safe and happy Thanksgiving to everyone!


.LONG TERM /Saturday through Thursday/...
The long term forecast period begins 12z Saturday with a fairly
amplified flow pattern in the mid and upper levels across the CONUS
as a ridge builds over the western US and a trough develops across
the east. Within this amplified regime...a shortwave embedded within
the cyclonic flow in the east will have lifted into the Upper
Great Lakes region...while a more subtle speed max races into
Missouri. At the sfc...associated Great Lakes reflection will
merge with a stronger area of low pressure from a shortwave in
Canada and push a cold front into the OH/TN Valleys. This front
will hardly contain any moisture...with the most notable effect
being increased RH between the 700-500mb layers. Think the main
effect from the front will be increased mid/high cloud cover
during its passage thru the day from NW to SE on Saturday. That
being said...see some increased /altho light/ precip being
generated in the latest guidance. With the shortwave from Missouri
accompanying the front as it moves towards our area...will have
to monitor potential for isolated light showers...mainly north

Saturday fropa will allow for slightly cooler temps on Sunday under
clear and dry conditions. Altho high pressure will be building in at
the sfc..weak NW flow in the mid levels is an open invitation for
shortwave energy riding over the western US ridge and into our
region. A wave is expected to move across the area late Sunday into
Monday...but at best would just be associated with some cirrus. Sfc
high pressure to continue the dry spell thru Monday.

By Monday afternoon..upper pattern transitions to more of a central
US ridge and western US trough as a cyclone enters the west coast of
Oregon. As this trough digs into the Intermountain US...the ridge
will be forced east & dampen and start pushing the sfc high
offshore. Tuesday will continue dry with increasing moisture but the
reminder of the forecast then becomes fuzzy. Both operational EC and
GFS have the northern stream energy associated with trough
outrunning the southern stream energy which would help develop a
closed low across the 4 corners vicinity. This not really seen in
EPS/GEFS/GEM ensemble data so think more of a broad positively
tilted trough will push the the region Wed/Thurs. Will likely have
some moisture move through near this time as the upper energy
creates a sfc frontal boundary.



18Z Update...
No major impacts weather expected across north and central GA
through the next 24-36 hours. Very shallow low lvl moisture
resulting in SCT-BKN cu btwn 020-030 will affect all the TAF
sites through late afternoon, and perhaps a couple hours longer at
KMCN, before improving conditions. By this evening, skies will
clear (NW to SE) and winds will become generally light (< 5kts)
through 18z/Fri.

//ATL Confidence...18Z Update...
High confidence all elements.



Athens          36  62  41  65 /   0   0   0   0
Atlanta         39  62  45  63 /   0   0   0   0
Blairsville     32  60  37  59 /   0   0   0  10
Cartersville    32  62  41  63 /   0   0   0   5
Columbus        40  66  44  68 /   0   0   0   0
Gainesville     38  60  43  62 /   0   0   0   0
Macon           39  65  40  68 /   0   0   0   0
Rome            33  62  40  61 /   0   0   0  10
Peachtree City  35  64  40  65 /   0   0   0   0
Vidalia         44  65  44  70 /  20   5   0   0




LONG TERM....Kovacik
AVIATION...DJN.83 is the U.S. government's official web portal to all federal, state and local government web resources and services.