Area Forecast Discussion
Issued by NWS Atlanta, GA

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FXUS62 KFFC 010257 AAC
AFDFFC

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1057 PM EDT FRI OCT 31 2014

.UPDATE...
ALTHOUGH NOT UNIFORM ACROSS THE AREA WE ARE ALREADY GETTING WINDS TO
AT OR ABOVE ADVISORY CRITERIA PERIODICALLY ACROSS THE NORTHWEST HALF
OF THE FORECAST AREA. HAVE GONE AHEAD AND ADVANCED THE ONSET OF THE
WIND ADVISORY TO 11PM NORTH AND WEST OF A LINE FROM COLUMBUS TO
COVINGTON AND ATHENS. ALREADY GETTING REPORTS OF RAIN/SNOW MIX OR
EVEN A COMPLETE CHANGE-OVER IN THE FAR NORTH. NOTHING OVER TRACE
ACCUMULATIONS YET BUT TEMPERATURES WILL BE DROPPING TO FREEZING UP
THERE OVER THE NEXT SEVERAL HOURS. NO CHANGES TO THE ANTICIPATED
AMOUNTS AT THIS TIME.

20

&&

.PREV DISCUSSION... /ISSUED 936 PM EDT FRI OCT 31 2014/

UPDATE...
INITIAL BAND OF SHOWERS ASSOCIATED WITH THE FIRST FRONTAL BOUNDARY
CONTINUES TO SINK SOUTHEAST AND SLOWLY DIMINISH. WINDS ARE BEGINNING
TO INCREASE AS WELL AND SHOULD CONTINUE TO DO SO THROUGH THE EARLY
MORNING HOURS WITH WIND ADVISORY LEVELS REACHED BEFORE SUN UP.
CURRENT SHORT TERM FORECAST GRIDS REMAIN ON TRACK SO NO SIGNIFICANT
CHANGES MADE AT THIS TIME. THREAT FOR A WINTRY MIX OF RAIN AND SNOW
IN THE FAR NORTH ASSOCIATED WITH THE MAIN UPPER LOW WILL CONTINUE TO
SPREAD TOWARD THE STATE FROM THE MID-OHIO VALLEY AS WE HEAD INTO THE
OVER-NIGHT HOURS.

20

PREV DISCUSSION... /ISSUED 720 PM EDT FRI OCT 31 2014/

SHORT TERM /TONIGHT THROUGH SATURDAY NIGHT/...
LOOKS LIKE THE FIRST SNOW EVENT OF THE SEASON FOR PORTIONS OF
NORTH GEORGIA. ALL THE MODELS ARE CONSISTENT WITH DIVING A STRONG
UPPER LOW INTO THE SOUTHEAST TONIGHT. ALREADY SEE LIGHT RETURNS ON
RADAR ACROSS THE CWA WITH THIS SYSTEM...HOWEVER WITH THE DRY AIR
MOST OF THE PRECIP IS NOT REACHING THE GROUND. MAIN FOCUS OF THE
SHORT TERM IS THE WRAP AROUND MOISTURE WITH THE UPPER LOW THAT
WILL AFFECT NORTH GEORGIA LATE TONIGHT INTO SATURDAY MORNING. THIS
WILL BRING THE POTENTIAL FOR SNOW TO NORTH GEORGIA GENERALLY IN
THE MIDNIGHT TO MID MORNING TIME FRAME. BOTH THE NAM AND GFS BUFR
SOUNDINGS SHOW BELOW FREEZING TEMPS AT BRASSTOWN BALD BY 06Z WITH
THE COLUMN SATURATED BELOW ABOUT 800MB. WITH A CONDUCIVE
ATMOSPHERE IN PLACE FOR SEVERAL HOURS...EXPECT SOME OF THE SNOW TO
ACCUMULATE. GENERALLY AROUND AN INCH OR LESS IN THE NORTH GEORGIA
MOUNTAINS WITH AROUND TWO INCHES AT THE HIGHER ELEVATIONS. THIS
LINES UP WELL WITH THE SPREAD OF GUIDANCE. GIVEN THIS SETUP AND
FORECAST SNOW ACCUMULATION...WILL ISSUE A WINTER WEATHER ADVISORY
FOR PORTIONS OF FAR NORTHEAST AND NORTH CENTRAL GEORGIA FOR
TONIGHT THROUGH MID SATURDAY MORNING. AREAS THAT MAY SEE A FLURRY
TO A DUSTING HAVE BEEN INCLUDED IN AN SPS.

BIGGEST UNCERTAINTY IS HOW FAR SOUTH THE SNOW WILL BE ABLE TO
MAKE IT. MODELS HAVE BEEN TRENDING FURTHER SOUTH WITH THE UPPER
LEVEL SYSTEM SO HAVE REFLECTED THIS IN THE RAIN/SNOW MIX BEING
FURTHER SOUTHWARD AND INTO NORTHERN PORTIONS OF THE METRO AREA.
EVEN THOUGH PARTS OF THE NORTHERN METRO AREA COULD SEE A FEW
SNOWFLAKES AROUND THE 12Z TIME PERIOD...DO NOT EXPECT ANY
ACCUMULATION.

WITH THE TIGHT PRESSURE GRADIENT SETTING UP TONIGHT ACROSS THE
CWA...WILL SEE A SIGNIFICANT INCREASE IN WIND SPEEDS AND BY
SATURDAY SOME AREAS MAY EVEN SEE WINDS GUSTS TO 40MPH. BASED ON
THIS...HAVE ISSUED A WIND ADVISORY FOR THE CWA FOR SATURDAY. THE
STRONG WINDS ON SATURDAY COMBINED WITH THE COLD TEMPERATURES WILL
ONLY ALLOW FOR THE WIND CHILL VALUES SATURDAY AFTERNOON TO REACH
THE 30S IN THE NORTHEAST...40S ACROSS THE METRO AREA AND 50S
ACROSS CENTRAL GEORGIA. END RESULT...ITS GOING TO FEEL VERY COLD
TOMORROW AND IF YOURE SPENDING ANY TIME OUTSIDE DRESS
APPROPRIATELY.

COLD TEMPERATURES ARE FORECAST THROUGH THE SHORT TERM...WITH BOTH
HIGH AND LOW TEMPS BEING WELL BELOW NORMAL. HIGH TEMPERATURES ON
SATURDAY WILL BE ABOUT TWENTY DEGREES BELOW NORMAL. FOR THE MOST
PART...NOT EXPECTING TO BREAK ANY RECORDS FOR LOW MAXIMUM
TEMPERATURES. CSG IS THE ONLY EXCEPTION WITH THE FORECAST BEING
WITHIN ONE DEGREE OF THE RECORD. LOW TEMPERATURES TONIGHT ARE
AROUND 10 TO 15 DEGREES BELOW NORMAL. ACROSS FAR NORTH
GEORGIA...TEMPERATURES WILL DIP DOWN TO FREEZING TONIGHT AND THUS
HAVE CONTINUED THE FREEZE WARNING. EVEN COLDER TEMPERATURES ARE
EXPECTED SUNDAY MORNING WITH MUCH OF NORTH AND CENTRAL GEORGIA
FORECAST TO REACH FREEZING OR BELOW AND THUS A FREEZE WATCH HAS
BEEN ISSUED FOR SUNDAY MORNING.

11/RW

LONG TERM /SUNDAY THROUGH FRIDAY/...
AFTER THE WEATHER EXCITEMENT OF THE SHORT TERM...THE LONG TERM
SEEMS A LITTLE BENIGN. EXTENDED BEGINS WITH DEEP NORTHWEST FLOW IN
PLACE AS HIGH AMPLITUDE WAVETRAIN PUSHES EAST. SURFACE HIGH
PRESSURE SETTLES OVER THE AREA SUNDAY AND SUNDAY NIGHT SO EXPECT
ANOTHER COOL DAY SUNDAY /THOUGH NOT QUITE AS COLD AS SATURDAY/ AND
TEMPERATURES PLUMMETING AGAIN WITH CALM WINDS SUNDAY NIGHT. WILL
LIKELY NEED ANOTHER ROUND OF FREEZE/FROST PRODUCTS SUNDAY NIGHT
BUT WILL DEAL WITH THAT TOMORROW. EXPECT TEMPERATURES TO MODERATE
INTO THE BEGINNING OF NEXT WEEK AS UPPER RIDGING MOVES OVER THE
AREA...AND REALLY FAIRLY PLEASANT BY TUESDAY. HOWEVER...CLOUDS
WILL BEGIN INCREASING AGAIN IN ADVANCE OF THE NEXT SYSTEM WHICH
PUSHES THROUGH THE NORTHERN PLAINS AND UPPER MIDWEST DURING THE
DAY ON TUESDAY. SOUTHWEST FLOW ALOFT WILL BRING INCREASING
MOISTURE TO THE AREA AS WELL AS THE FRONT ELONGATES AND STRETCHES
FROM THE SOUTHERN PLAINS TO NEW ENGLAND. DID NOT MAKE ANY CHANGES
TO POPS AT THIS TIME...WITH SLIGHT TO LOW CHANCES BUILDING IN ON
WEDNESDAY AS THE MOISTURE WASHES OUT. TOO MUCH UNCERTAINTY TO MAKE
ANY CHANGES BEYOND THAT AS WELL. SEE PREVIOUS DISCUSSION BELOW.

TDP

LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/...
/ISSUED 508 AM EDT FRI OCT 31 2014/
DEEP UPPER TROUGH MOVING OFF THE ATLANTIC COAST AT THE START OF
THE PERIOD. STRONG COLD ADVECTION CONTINUES AND SATURDAY NIGHT
LOWS ARE EXPECTED TO BE IN THE 30S ACROSS THE REGION...WITH 20S IN
THE NORTHEAST. PRECIPITATION SHOULD BE EAST OF THE FORECAST AREA.
UPPER RIDGE GRADUALLY BUILDING EASTWARD INTO THE FIRST OF THE WEEK
WITH SOME TEMPERATURE MODIFICATION. NEXT CHANCE OF RAIN SHOULD BE
WEDNESDAY INTO THURSDAY AS SOUTHWEST FLOW BRINGS AN INCREASE IN
MOISTURE ACROSS THE STATE. MODELS ARE SHOWING SOME DIFFERENCES IN
TIMING OF THIS NEXT FRONT...HOWEVER LOW POPS LOOK REASONABLE FOR
WEDNESDAY INTO THURSDAY.

41

FIRE WEATHER...
WILL HAVE TO MONITOR FUEL MOISTURES THIS AFTERNOON AND TONIGHT
SINCE WINDS ON SATURDAY WILL DEFINITELY MEET FIRE DANGER CRITERIA.
RELATIVE HUMIDITY VALUES REMAIN TOO HIGH SO NO CHANCE OF A RED
FLAG WARNING BUT IF FUEL MOISTURES DROP TONIGHT...MAY HAVE TO
ISSUE A FIRE DANGER STATEMENT FOR SATURDAY. WINDS DROP ENOUGH
SUNDAY THAT FIRE WEATHER CONCERNS ALSO DIMINISH.

TDP

AVIATION...
00Z UPDATE...
VFR CONDITIONS PREVAIL ACROSS ALL BUT THE FAR NORTHWEST PORTION OF
THE FORECAST AREA AT THIS TIME. MVFR CEILINGS ACROSS THE FAR
NORTHWEST WILL SPREAD SOUTHEAST ACROSS THE NORTHERN HALF OF THE AREA
BETWEEN 00Z AND 06Z...PERSISTING THROUGH 14Z. VFR CONDITIONS ARE
EXPECTED TO RETURN TO ALL BUT THE FAR NORTHEAST BY 16-20Z. ISOLATED
TO SCATTERED SHOWERS THIS EVENING ACROSS THE NORTHERN HALF OF THE
AREA. RAIN SHOWERS...MIXING WITH OR CHANGING TO SNOW SHOWERS...ARE
EXPECTED TO BECOME MORE WIDESPREAD ACROSS THE FAR NORTH AFTER 06Z.
PRECIPITATION WILL BE ENDING ACROSS THE FAR NORTH BY 20-00Z.
NORTHWEST WINDS 7-12KT WILL BE INCREASING OVERNIGHT REACHING 12-16KT
W/ GUSTS 20-25KT BY 06-10Z AND 18-20KT W/ GUSTS 25-35KT BY 12Z.

//ATL CONFIDENCE...00Z UPDATE...
MEDIUM TO HIGH.

20

&&

.PRELIMINARY POINT TEMPS/POPS...
ATHENS          36  51  30  57 /  20  20   5   0
ATLANTA         34  50  31  55 /  20  10   0   0
BLAIRSVILLE     32  43  26  51 /  50  60  10   0
CARTERSVILLE    33  49  28  54 /  30  20   0   0
COLUMBUS        37  55  33  60 /  10   0   0   0
GAINESVILLE     36  49  31  55 /  20  20   5   0
MACON           36  56  32  59 /  10   5   0   0
ROME            33  50  29  55 /  30  20   0   0
PEACHTREE CITY  34  52  28  56 /  20  10   0   0
VIDALIA         41  56  37  59 /  10   5   0   0

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY FROM 7 AM TO 9 PM EDT SATURDAY FOR THE FOLLOWING
ZONES: BALDWIN...BIBB...BLECKLEY...CHATTAHOOCHEE...CRAWFORD...
CRISP...DODGE...DOOLY...EMANUEL...GLASCOCK...GREENE...HANCOCK...
HOUSTON...JASPER...JEFFERSON...JOHNSON...JONES...LAURENS...
MACON...MARION...MONROE...MONTGOMERY...MORGAN...OGLETHORPE...
PEACH...PULASKI...PUTNAM...SCHLEY...STEWART...SUMTER...
TALIAFERRO...TAYLOR...TELFAIR...TOOMBS...TREUTLEN...TWIGGS...
WARREN...WASHINGTON...WEBSTER...WHEELER...WILCOX...WILKES...
WILKINSON.

FREEZE WATCH FROM LATE SATURDAY NIGHT THROUGH SUNDAY MORNING FOR
THE FOLLOWING ZONES: BALDWIN...BANKS...BARROW...BARTOW...BIBB...
BUTTS...CARROLL...CATOOSA...CHATTAHOOCHEE...CHATTOOGA...
CHEROKEE...CLARKE...CLAYTON...COBB...COWETA...CRAWFORD...CRISP...
DADE...DAWSON...DEKALB...DOOLY...DOUGLAS...FANNIN...FAYETTE...
FLOYD...FORSYTH...GILMER...GLASCOCK...GORDON...GREENE...
GWINNETT...HALL...HANCOCK...HARALSON...HARRIS...HEARD...HENRY...
HOUSTON...JACKSON...JASPER...JEFFERSON...JONES...LAMAR...
LUMPKIN...MACON...MADISON...MARION...MERIWETHER...MONROE...
MORGAN...MURRAY...MUSCOGEE...NEWTON...NORTH FULTON...OCONEE...
OGLETHORPE...PAULDING...PEACH...PICKENS...PIKE...POLK...PUTNAM...
ROCKDALE...SCHLEY...SOUTH FULTON...SPALDING...STEWART...SUMTER...
TALBOT...TALIAFERRO...TAYLOR...TOWNS...TROUP...TWIGGS...UNION...
UPSON...WALKER...WALTON...WARREN...WASHINGTON...WEBSTER...
WHITE...WHITFIELD...WILKES...WILKINSON.

WINTER WEATHER ADVISORY UNTIL NOON EDT SATURDAY FOR THE
FOLLOWING ZONES: DAWSON...FANNIN...GILMER...LUMPKIN...MURRAY...
PICKENS...TOWNS...UNION...WHITE.

WIND ADVISORY UNTIL 9 PM EDT SATURDAY FOR THE FOLLOWING ZONES:
BANKS...BARROW...BARTOW...BUTTS...CARROLL...CATOOSA...
CHATTOOGA...CHEROKEE...CLARKE...CLAYTON...COBB...COWETA...DADE...
DAWSON...DEKALB...DOUGLAS...FANNIN...FAYETTE...FLOYD...FORSYTH...
GILMER...GORDON...GWINNETT...HALL...HARALSON...HARRIS...HEARD...
HENRY...JACKSON...LAMAR...LUMPKIN...MADISON...MERIWETHER...
MURRAY...MUSCOGEE...NEWTON...NORTH FULTON...OCONEE...PAULDING...
PICKENS...PIKE...POLK...ROCKDALE...SOUTH FULTON...SPALDING...
TALBOT...TOWNS...TROUP...UNION...UPSON...WALKER...WALTON...
WHITE...WHITFIELD.

FREEZE WARNING FROM 2 AM TO 11 AM EDT SATURDAY FOR THE FOLLOWING
ZONES: CATOOSA...CHATTOOGA...DADE...DAWSON...FANNIN...GILMER...
GORDON...LUMPKIN...MURRAY...PICKENS...TOWNS...UNION...WALKER...
WHITE...WHITFIELD.

&&

$$

SHORT TERM...20
LONG TERM....NLISTEMAA
AVIATION...20





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