Area Forecast Discussion
Issued by NWS Atlanta, GA

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000
FXUS62 KFFC 221946
AFDFFC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
246 PM EST SAT NOV 22 2014


.SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/...
SURFACE RIDGE OF HIGH PRESSURE CENTERED OVER THE CAROLINAS IS
SHIFTING EAST BUT STILL RIDGING IN PLACE DOWN THE APPALACHIANS. AS A
WARM FRONT LIFTS NORTHWARD TONIGHT AND POSITIONS ITSELF ACROSS THE
CWA...WILL SEE CLOUDS AND PRECIPITATION INCREASE ACROSS THE CWA FROM
SOUTH TO NORTH. HARD TO TELL AT THIS POINT HOW FAR NORTH THE WARM
FRONT WILL MAKE IT INITIALLY BUT THIS WILL IMPACT TEMPERATURES
AND SEVERE POTENTIAL. PRECIPITATION WILL CONTINUE INTO SUNDAY WITH
BASICALLY A 100 PERCENT CHANCE OF RAIN FOR THE CWA. FINALLY THE
UPPER LEVEL SHORT WAVE ACROSS TX THIS AFTERNOON WILL LIFT NORTH
INTO THE TN VALLEY AND EVENTUALLY BEGIN PUSHING SOME OF THE SYSTEM
OUT OF THE CWA SUNDAY NIGHT.

BEST SEVERE POTENTIAL CONTINUES TO BE ACROSS CENTRAL GEORGIA. MUCAPE
VALUES REACH THE 500-1000J/KG RANGE SUNDAY AFTERNOON ACROSS THE FAR
SOUTHERN PORTION OF THE CWA...WHICH IS PRETTY DECENT FOR THIS TIME
OF YEAR. GFS SHOWS 30-40KTS OF LOW LEVEL SHEAR ON SUNDAY...HOWEVER
THE NAM IS MUCH MORE AGGRESSIVE WITH SOME VALUES EXCEEDING 50KTS.
THE NAM MAY BE SLIGHTLY OVERDONE...BUT EVEN SO IF THE NAM OR GFS
VALUES ARE OBSERVED ON SUNDAY...WOULD EXPECT TO SEE SOME SEVERE
WEATHER ACROSS CENTRAL GEORGIA INCLUDING THE POTENTIAL FOR DAMAGING
WINDS AND A FEW TORNADOES. CANNOT RULE OUT SOME STRONG STORMS ACROSS
NORTH GEORGIA AS THEY HAVE DECENT SHEAR AND MUCAPE VALUES AROUND 100-
300J/KG BUT LESS LIKELY ACROSS THIS AREA. LOOKING AT THE LOCAL
WRF...IT IMPLIES WIDESPREAD RAIN ACROSS THE CWA BY SUNRISE...THEN
POTENTIALLY A FEW BREAKS IN THE PRECIP...THEN MORE CONVECTION IN THE
AFTERNOON AS THE FRONT ASSOCIATED WITH THE UPPER LEVEL WAVE PUSHES
THROUGH.

BESIDES SEVERE...HYDROLOGY IS THE OTHER ASPECT TO THIS SYSTEM. SEE
THE HYDRO SECTION FOR MORE DETAILS.

DO NOT HAVE A GOOD HANDLE ON TEMPS FOR TONIGHT AND TOMORROW WITH THE
WEATHER SYSTEM MOVING IN. WILL BE WARMER THAN LAST NIGHT WITH CLOUDS
AND WARM FRONT LIFTING ACROSS GA. FOR SUNDAY...BIG DIFFERENCES
BETWEEN THE MAV AND MET. MET IS MUCH COLDER AND KEEPS AREA CLOUDY
WHILE THE MAV IS WARMER AND TRIES TO PUSH CLOUDS OUT IN THE LATE
AFTERNOON. COULD SEE SOME BREAKS TOMORROW AFTERNOON BUT THINK IT
WOULD BE LIMITED SO STAYED IN THE MIDDLE OF GUIDANCE.


11


.LONG TERM /MONDAY THROUGH SATURDAY/...
THE SUNDAY SYSTEM WILL BE EXITING RAPIDLY LEAVING A FEW SHOWERS
ACROSS THE EASTERN AND NORTHERN AREAS OF THE CWA MONDAY. BY MONDAY
NIGHT DRY AIR WILL HAVE SPREAD ACROSS THE CWA ENDING THE PRECIP. THE
NEXT SHORT WAVE WILL DROP INTO THE UPPER TROUGH OVER THE MISSISSIPPI
VALLEY TUESDAY. THIS WILL HELP KICK THE UPPER TROUGH EASTWARD AS
WELL AS GENERATE ANOTHER SYSTEM OVER THE EASTERN GULF. THIS WILL
SPREAD MOISTURE INTO THE CWA LATE TUESDAY INTO TUESDAY NIGHT AND
WEDNESDAY. THIS WILL EXIT THE CWA BY LATE WEDNESDAY AS DRY AIR
SPREADS OVER THE CWA. IT SHOULD REMAIN DRY FOR THE REST OF THE LONG
TERM.

17


&&

.HYDROLOGY...
SOME MUCH NEEDED RAIN WILL SPREAD ACROSS THE AREA TONIGHT
AND SUNDAY. RAINFALL AMOUNTS OF 1-2 INCHES ARE POSSIBLE ACROSS NORTH
GEORGIA WITH AROUND 2-2.5 ACROSS CENTRAL GEORGIA. WITH THE HIGHER
AMOUNTS GENERALLY EXPECTED ACROSS CENTRAL GEORGIA...THE GROUND
SHOULD BE ABLE TO HANDLE THIS MUCH PRECIP. EVEN SO WITH ISOLATED
HIGHER AMOUNTS...LOCALIZED FLOODING IS POSSIBLE.

&&

.AVIATION...
18Z UPDATE... CLOUDS HAVE BEEN SLOW TO MOVE INTO THE NORTHERN TAF
SITES BUT OVERNIGHT CIGS WILL DROP INTO THE IFR CATEGORY. SOME
GUIDANCE POINTS AT 400FT SO WILL HAVE TO WATCH SUNDAY MORNING
CLOSELY. RAIN WILL BEGIN OVERNIGHT AT THE TAF SITES. HAVE MOVED
THE TIMING UP SLIGHTLY IN THE TAFS...BUT MAY STILL BE ON THE SLOW
SIDE...PARTICULARLY AT THE ATL SITES AND AHN.

//ATL CONFIDENCE...18Z UPDATE...
HIGH CONFIDENCE ON WIND. MEDIUM CONFIDENCE ON VSBYS. LOW
CONFIDENCE ON TIMING AND CIGS.

11

&&

.PRELIMINARY POINT TEMPS/POPS...
ATHENS          44  55  53  68 /  90 100  70  20
ATLANTA         46  57  54  66 /  90 100  40  10
BLAIRSVILLE     40  54  47  61 /  70 100  60  20
CARTERSVILLE    44  57  51  64 /  80 100  50  10
COLUMBUS        52  65  59  70 / 100 100  40  10
GAINESVILLE     44  54  49  64 /  90 100  60  10
MACON           53  66  61  73 / 100 100  60  20
ROME            44  58  53  63 /  80 100  50  10
PEACHTREE CITY  47  58  54  67 / 100 100  40  10
VIDALIA         56  71  65  75 / 100 100  80  30

&&

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

$$

SHORT TERM...11
LONG TERM....17
AVIATION...11



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