Special Weather Statement, NWS Atlanta, GA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
927 PM EDT WED JUN 13 2012

.UPDATE...
EVENING CONVECTION THAT FIRED OFF ALONG SOME WEAK CONVERGENT ZONES
IS OVERALL STARTING TO WANE WITH THE END OF DAYTIME HEATING AND
ASSOCIATED REDUCTION IN INSTABILITY. HAVE INCLUDED CHANCE TO
SLIGHT CHANCE POPS ACROSS MOST AREAS UNTIL 06Z. CAD WEDGE IS PROGGED
TO INFLUENCE THE AREA FROM THE NE ON THURSDAY MOSTLY FROM 12-00Z.
WITH LACK OF DEPTH TO THE MOISTURE FIELD BUT FORECAST CAPE VALUES
OF NEAR 2000 J/KG BY THE AFTERNOON HOURS... THE CHANCE FOR SHOWERS
AND THUNDERSTORMS CANNOT BE RULED OUT ALONG THE WEDGE FRONT WITH
ANY ENHANCED LIFT. HAVE THEREFORE GONE WITH SLIGHT POPS FOR MOST
AREAS AND LOW CHANCE POPS IN THE SOUTH. MINOR TWEAKS WERE MADE TO
OVERNIGHT TEMPS. REST OF FORECAST LOOKED TO BE ON TRACK. PREVIOUS
DISCUSSION FOLLOWS...

BAKER

&&

.PREV DISCUSSION... /ISSUED 310 PM EDT WED JUN 13 2012/

.SHORT TERM /TONIGHT THROUGH THURSDAY NIGHT/...
CURRENT RADAR LOOP SHOWS SOME SHOWERS AND ISOLATED THUNDERSTORMS
POPPING UP JUST NE AND SW OF THE AREA. THE WEAK FRONT OVER THE STATE
HAS FINALLY PUSHED INTO SOUTHERN GA ALLOWING DRIER AIR TO FILTER
INTO THE REGION FROM THE NW. HIGH PRESSURE CENTERED OVER THE GREAT
LAKES STATES IS MOVING EAST AS IT BUILD SOUTHWARD THROUGH TONIGHT.
THIS RIDGE BEGINS TO WEDGE DOWN THE EASTERN SEABOARD THURSDAY
PUTTING GA IN NORTHEASTERLY FLOW THROUGH THE END OF THE WEEK. THIS
RIDGE OF HIGH PRESSURE WILL ALSO KEEP GA DRY THROUGH THE SHORT TERM.
THERE MAY BE A FEW SHOWERS THAT POPS UP ALONG OUR EXTREME SOUTHERN
BORDER ALONG THE EDGE OF THE RIDGE BUT IT WILL BE MOSTLY DEPENDENT
UPON JUST HOW DEEP THE RIDGE BUILDS INTO THE STATE.

01

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
BY FRIDAY MORNING...HIGH PRESSURE RIDGE BUILDING DOWN THE
APPALACHIANS STRETCHED WELL INTO THE STATE...KEEPING POP POTENTIAL
AT BAY. ISOLATED CONVECTION POSSIBLE ACROSS PORTIONS OF SOUTHERN
GEORGIA AROUND THE PERIPHERY OF THE RIDGE. THIS RIDGE DOMINATES
THE EXTENDED PERIODS INTO EARLY WEEK. A FEW MODELS HIGHLIGHTING AN
UPPER LEVEL LOW DEVELOPING OFF THE MID ATLANTIC COAST THE FIRST
HALF OF THE WEEK. AS A RESULT...BANDS OF MOISTURE MOVING INTO THE
SOUTHEAST COULD SUPPORT ISOLATED CONVECTION...EVEN UNDER THE
INFLUENCE OF THE SURFACE HIGH. AS A RESULT...HAVE CONTINUED A
GENERALLY DRY FORECAST THROUGH THE EXTENDED...ASIDE FROM SOME
SLIGHT CHANCE POPS ACROSS THE SOUTHERN CWA EACH AFTERNOON MONDAY
THROUGH WEDNESDAY.

EXPECTING SLIGHTLY COOLER TEMPERATURES INTO THE EXTENDED
PERIOD...WITH NEAR NORMAL HIGHS. GRADUAL WARMING TREND FROM THE
LOW 80S TO THE MID TO UPPER 80S IS EXPECTED BY MID WEEK NEXT WEEK.

31

.AVIATION...
00Z UPDATE...
VFR CONDITIONS EXPECTED THROUGH FORECAST PERIOD. MAIN FORECAST
CONCERN IS TSRA DEVELOPING NEAR MOST SITES EXCEPT KAHN AND KCSG.
PULSE CONVECTION THIS EVENING HAS BEEN SHORT-LIVED BUT OUTFLOW
BOUNDARIES MAY ALLOW FOR CONVECTIVE REDEVELOPMENT FOR SEVERAL
HOURS. HAVE INCLUDED TEMPO FOR TSRA AND BKN050CB UNTIL 02Z
TONIGHT. WINDS HAVE BEEN QUITE VARIABLE AND LIGHT ACROSS MOST
SITES... HOWEVER A SHIFT FROM THE NE SHOULD EVENTUALLY OCCUR
FOLLOWING ANY STORM INFLUENCE. THESE SHOULD BECOME EASTERLY BY 15Z
THURSDAY AND STAY 5-10 KTS.

//ATL CONFIDENCE...00Z UPDATE...
MEDIUM CONFIDENCE ON DURATION OF PRECIPITATION THIS EVENING.
HIGH CONFIDENCE ON ALL ELSE.

BAKER

&&

.PRELIMINARY POINT TEMPS/POPS...
ATHENS          68  89  63  83 /  30  20  10  10
ATLANTA         72  87  65  82 /  30  20  20  10
BLAIRSVILLE     64  84  61  79 /  30  20  10  20
CARTERSVILLE    66  88  62  84 /  30  20  20  10
COLUMBUS        72  91  66  87 /  20  20  20  10
GAINESVILLE     68  86  65  81 /  30  20  10  10
MACON           70  90  64  86 /  30  20  20  10
ROME            67  91  64  86 /  20  20  20  20
PEACHTREE CITY  66  88  62  83 /  30  20  20  10
VIDALIA         73  91  67  85 /  30  30  20   5

&&

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

SHORT TERM...01
LONG TERM....31
AVIATION...BAKER

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
939 PM EDT WED JUN 13 2012

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-150145-
BALDWIN-BANKS-BARROW-BARTOW-BIBB-BLECKLEY-BUTTS-CARROLL-CATOOSA-
CHATTAHOOCHEE-CHATTOOGA-CHEROKEE-CLARKE-CLAYTON-COBB-COWETA-
CRAWFORD-CRISP-DADE-DAWSON-DEKALB-DODGE-DOOLY-DOUGLAS-EMANUEL-
FANNIN-FAYETTE-FLOYD-FORSYTH-GILMER-GLASCOCK-GORDON-GREENE-
GWINNETT-HALL-HANCOCK-HARALSON-HARRIS-HEARD-HENRY-HOUSTON-JACKSON-
JASPER-JEFFERSON-JOHNSON-JONES-LAMAR-LAURENS-LUMPKIN-MACON-
MADISON-MARION-MERIWETHER-MONROE-MONTGOMERY-MORGAN-MURRAY-
MUSCOGEE-NEWTON-NORTH FULTON-OCONEE-OGLETHORPE-PAULDING-PEACH-
PICKENS-PIKE-POLK-PULASKI-PUTNAM-ROCKDALE-SCHLEY-SOUTH FULTON-
SPALDING-STEWART-SUMTER-TALBOT-TALIAFERRO-TAYLOR-TELFAIR-TOOMBS-
TOWNS-TREUTLEN-TROUP-TWIGGS-UNION-UPSON-WALKER-WALTON-WARREN-
WASHINGTON-WEBSTER-WHEELER-WHITE-WHITFIELD-WILCOX-WILKES-
WILKINSON-
939 PM EDT WED JUN 13 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH AND CENTRAL GEORGIA.

.DAY ONE...TONIGHT...
ISOLATED THUNDERSTORMS POSSIBLE BEFORE MIDNIGHT TONIGHT ACROSS
NORTH AND CENTRAL GEORGIA.

.SYNOPSIS...
A WEAK FRONTAL BOUNDARY WILL PUSH INTO SOUTH GEORGIA TONIGHT AS
HIGH PRESSURE BUILDS DOWN THE APPALACHIANS.

.PRIMARY HAZARDS...
THE PRIMARY HAZARDS ASSOCIATED WITH THUNDERSTORMS THAT DEVELOP WILL
BE STRONG WINDS...HAIL...LOCALLY HEAVY RAIN PRODUCING FLOODING AND
OCCASIONAL LIGHTNING. THE MOST FAVORED AREA FOR DEVELOPMENT WILL
BE THE AREA GENERALLY EAST AND SOUTH OF A LINE FROM LA GRANGE TO
ATLANTA TO BLUE RIDGE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...
THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ACROSS THE MAJORITY OF
THE AREA ON THURSDAY... IN THE NORTH ON FRIDAY... PORTIONS OF THE
NORTHEAST AND SOUTHEAST ON MONDAY... AND ACROSS THE SOUTH ON
TUESDAY.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT EXPECTED THROUGH TONIGHT.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
931 PM EDT WED JUN 13 2012

GAZ033-045-140215-
931 PM EDT WED JUN 13 2012

...SIGNIFICANT WEATHER ADVISORY FOR PEA SIZED HAIL AND 40 MPH WINDS
IN DEKALB AND FULTON COUNTIES UNTIL 1015 PM EDT...

AT 931 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER DUNWOODY...MOVING EAST AT 5 MPH.

WIND GUSTS OF 40 MPH ARE LIKELY AS THIS STORM MOVES ACROSS DEKALB AND
FULTON COUNTIES THROUGH 1015 PM EDT. SOME LOCATIONS IN THE PATH OF
THE STORM INCLUDE BUCKHEAD...BROOKHAVEN...DUNWOODY...CHASTAIN
MEMORIAL PARK...SANDY SPRINGS...LA VISTA...CHAMBLEE...DRUID HILLS AND
DORAVILLE.

&&

LAT...LON 3399 8434 3395 8427 3392 8426 3390 8423
      3389 8423 3379 8432 3386 8445
TIME...MOT...LOC 0132Z 287DEG 3KT 3392 8431

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1013 PM EDT WED JUN 13 2012

GAZ074-076-085-086-140315-
1013 PM EDT WED JUN 13 2012

...SIGNIFICANT WEATHER ADVISORY FOR PEA SIZED HAIL AND 40 MPH WINDS
IN WASHINGTON...JOHNSON...EMANUEL AND JEFFERSON COUNTIES UNTIL 1115
PM EDT...

AT 1008 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 9 MILES NORTHEAST OF THREE POINTS...MOVING WEST
AT 20 MPH.

WIND GUSTS OF 40 MPH ARE LIKELY AS THIS STORM MOVES ACROSS
WASHINGTON...JOHNSON...EMANUEL AND JEFFERSON COUNTIES THROUGH 1115 PM
EDT. SOME LOCATIONS IN THE PATH OF THE STORM INCLUDE THREE POINTS...
CANOOCHEE...COLEMANS LAKE...SUMMERTOWN...MODOC...WADLEY...DELLWOOD...
SWAINSBORO...BARTOW...BLUNDALE...NORRISTOWN JUNCTION...NEW HOME...
KITE...PRINGLE AND HARRISON.

&&

LAT...LON 3246 8241 3284 8276 3293 8227 3291 8227
      3284 8231 3283 8226 3281 8222 3282 8215
      3281 8213 3272 8210
TIME...MOT...LOC 0213Z 069DEG 18KT 3285 8215

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1019 PM EDT WED JUN 13 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0830 PM     TSTM WND DMG     2 WNW RIVERDALE         33.58N 84.45W
06/13/2012                   CLAYTON            GA   911 CALL CENTER

            911 CENTER REPORTS NUMEROUS TREES AND POWERLINES DOWN
            ACROSS THE COUNTY INCLUDING TREES AND LINES DOWN ALONG
            THORNHEDGE DR.

&&

DEESE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1104 PM EDT WED JUN 13 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0825 PM     HAIL             4 NNW JONESBORO         33.58N 84.39W
06/13/2012  E1.00 INCH       CLAYTON            GA   PUBLIC

            SECURITY DETAIL AT THE SOUTHERN REGIONAL MEDICAL CENTER
            REPORTED QUARTER SIZED HAIL AT THE FACILITY.

&&

DEESE

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
120 AM EDT THU JUN 14 2012

GAZ104-140545-
120 AM EDT THU JUN 14 2012

...SIGNIFICANT WEATHER ADVISORY FOR HEAVY RAIN AND FREQUENT
LIGHTNING IN SUMTER COUNTY UNTIL 145 AM EDT...

AT 119 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER LAMAR...MOVING WEST AT 10 MPH.

THIS STORM HAS THE POTENTIAL TO PRODUCE PEA SIZED HAIL...FREQUENT
CLOUD TO GROUND LIGHTNING AND WIND GUSTS TO 35 MPH AS IT MOVES ACROSS
SUMTER COUNTY THROUGH 145 AM EDT. SOME LOCATIONS IN THE PATH OF THIS
STORM INCLUDE COBB...DESOTO...LAMAR...LESLIE...HUNTINGTON AND
AMERICUS. HEAVY DOWNPOURS WILL CAUSE PONDING OF WATER ON ROADWAYS.

&&

LAT...LON 3211 8425 3211 8400 3209 8398 3205 8398
      3202 8395 3192 8392 3190 8405 3191 8424
TIME...MOT...LOC 0520Z 088DEG 10KT 3201 8402

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
126 AM EDT THU JUN 14 2012

GAZ032-033-043-044-140600-
126 AM EDT THU JUN 14 2012

...SIGNIFICANT WEATHER ADVISORY FOR HEAVY RAIN IN COBB...DOUGLAS AND
FULTON COUNTIES UNTIL 200 AM EDT...

AT 124 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER SIX FLAGS OVER GEORGIA...MOVING SOUTHWEST AT
15 MPH.

THIS STORM HAS THE POTENTIAL TO PRODUCE PEA SIZED HAIL...FREQUENT
CLOUD TO GROUND LIGHTNING AND WIND GUSTS TO 35 MPH AS IT MOVES ACROSS
COBB...DOUGLAS AND FULTON COUNTIES THROUGH 200 AM EDT. SOME LOCATIONS
IN THE PATH OF THIS STORM INCLUDE CASCADE HEIGHTS...EAST POINT...SIX
FLAGS OVER GEORGIA...MABLETON...AUSTELL...SANDTOWN...SWEETWATER CREEK
STATE PARK...LITHIA SPRINGS...CAMPBELLTON...DOUGLASVILLE AND CHAPEL
HILL. HEAVY DOWNPOURS WILL CAUSE PONDING OF WATER ON ROADWAYS.

&&

LAT...LON 3354 8467 3373 8482 3387 8452 3369 8439
TIME...MOT...LOC 0526Z 057DEG 11KT 3375 8454