Special Weather Statement, NWS Atlanta, GA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
339 PM EDT THU AUG 11 2011

.SHORT TERM /TONIGHT THROUGH SATURDAY NIGHT/...

LATEST MSAS ANALYSIS SHOWS WEAK LOW PRESSURE FROM EAST CENTRAL
GEORGIA THROUGH SOUTH CAROLINA. FOR NOW...IT IS A TALE OF TWO
FORECAST AREAS...THE EASTERN HALF AND THE WESTERN HALF. THE
EASTERN HALF CONTINUES TO BE DOMINATED BY LOW LEVEL DRY AIR WHICH
HAS INHIBITED CONVECTIVE INITIATION...THE RESULT OF DEWPOINTS IN
THE MID 50S. THIS AREA ARCHES BACK NORTHWEST OVER THE EXTREME
NORTH AS WELL WITH VERY LITTLE DEVELOPMENT NOTED. TO THE
WEST...AIRMASS HAS REALLY MODERATED WITH DEWPOINTS FROM PEACHTREE
CITY TO ALBANY AND POINTS WESTWARD IN THE LOWER TO MID 70S. THIS
ZONE WHICH CORRESPONDS TO AN AREA OF ENHANCED THETA E HAS TAKEN
ADVANTAGE OF AN EARLY MORNING MCS WHICH BRIEFLY DIED OUT BUT IS
NOW PRODUCING ISOLATED SEVERE STORMS LOCALLY. EXPECT THIS GENERAL
ZONE OF ACTIVITY TO CONTINUE FOR THE REMAINDER OF THE EVENING
HOURS WITH PERHAPS A SHIFT EASTWARD TOWARD MACON BEFORE DISSIPATING.

MIXED SIGNALS AMONG THE MODELS FOR FRIDAY...ESPECIALLY LATE IN THE
PERIOD. WHAT THE MODELS AGREE ON IS SHIFTING DEEP LAYER MOISTURE
SOUTH WHICH WILL BE THE FAVORED REGION FOR INITIAL THUNDERSTORM
DEVELOPMENT AND WILL INDICATE LOW CHANCE POPS. THEREAFTER...NAM12
WANTS TO BRING SEABREEZE ACTIVITY WELL TO THE WEST THROUGH LATE
EVENING ALLOWING FOR LATE DAY THUNDERSTORM ACTIVITY FOR CENTRAL
AND WESTERN ZONES. GFS ON THE OTHER HAND KEEPS ACTIVITY CONFINED
TO THE SOUTHEAST GEORGIA PORTION WITH NIL POPS. WILL COMPROMISE
FOR NOW AND INDICATE 20 POPS MOVING BACK TOWARD ATLANTA METRO LATE EVENING.

FOR SATURDAY...WILL BE TRANSITIONING FROM THE MESOSCALE TO THE
SYNOPTIC SCALE AS DEEP UPPER MIDWEST TROUGH EXPANDS EASTWARD. BY
LATE SATURDAY...IT APPEARS BEST DYNAMICS WILL BE PROGRESSING MORE
EAST THAN DIGGING SOUTH AN WILL SHOW A SHARP GRADIENT FOR POPS
FROM NORTH TO SOUTH. ACTIVITY WILL TEND TO SWING THROUGH SATURDAY
NIGHT AND WILL EXTEND CHANCE POPS INTO CENTRAL GEORGIA. MUCH OF
THE SEVERE POTENTIAL WITH THIS SYSTEM WILL BE DIURNALLY DRIVEN AND
TIMING WILL BE CRUCIAL. UNFORTUNATELY THE TIMING IS VERY UNCERTAIN
AT THIS POINT AND WILL NEED TO MONITOR CLOSELY WITH SUBSEQUENT
FORECASTS.

.LONG TERM /SUNDAY THROUGH THURSDAY/...IN THE POST FRONTAL
ENVIRONMENT...STILL LOOKS LIKE SIGNIFICANT DRY AIR TO MOVE INTO
THE AREA AND TEMPS TO DROP INTO THE UPPER 80S FOR HIGHS. CURRENT
FORECAST HAS A GOOD HANDLE ON THIS AND LIMITED CHANGES PLANNED.

&&

.AVIATION...
18Z UPDATE...
CONVECTION BEGINNING TO DEVELOP ACROSS WEST GEORGIA...HAVE
CONTINUED CB IN THE CLOUD GROUP FOR ALL BUT AHN TO ACCOUNT FOR
THIS. EXPECT SOME LOW VFR TO MVFR VSBY FRIDAY MORNING...MAINLY AT
MCN AND AHN...THOUGH IT WILL DEPEND ON WHERE RAIN FALLS. WESTERLY
WINDS THROUGH THE PERIOD...EXCEPT POSSIBLY BRIEF NORTHEASTERLY
EARLY FRIDAY MORNING. CB AGAIN IN THE CLOUD GROUP FRIDAY
AFTERNOON.

//ATL CONFIDENCE...18Z UPDATE...
HIGH ON WIND SPEEDS...MEDIUM TO LOW ON POTENTIAL WIND SHIFT
FRIDAY MORNING.
HIGH ON CIGS/VSBY.
LOW TO MEDIUM ON CONVECTION.

TDP

&&

.PRELIMINARY POINT TEMPS/POPS...
ATHENS          70  94  72  93 /  20  30  20  20
ATLANTA         72  92  73  90 /  20  30  20  30
BLAIRSVILLE     66  85  69  84 /  10  20  20  40
CARTERSVILLE    67  93  72  91 /  20  20  10  50
COLUMBUS        73  96  74  95 /  30  20  20  20
GAINESVILLE     71  91  73  89 /  10  30  20  30
MACON           74  96  73  93 /  20  30  20  20
ROME            68  95  67  93 /  30  20  10  50
PEACHTREE CITY  70  93  70  91 /  30  30  20  20
VIDALIA         74  96  75  92 /  20  40  30  30

&&

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

DEESE

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
532 AM EDT THU AUG 11 2011

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-120945-
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-
532 AM EDT THU AUG 11 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH AND CENTRAL GEORGIA.

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

.SYNOPSIS...
FRONTAL BOUNDARY ACROSS NORTH GEORGIA WILL PUSH SOUTH THROUGH THE
DAY TODAY AS AN UPPER LEVEL DISTURBANCE ENTERS THE REGION.

.PRIMARY HAZARDS...
THE PRIMARY HAZARDS WILL BE CLOUD TO GROUND LIGHTNING AND GUSTY WINDS.

.DISCUSSION...
AN UPPER LEVEL DISTURBANCE DROPS DOWN INTO NORTH AND CENTRAL
GEORGIA FROM THE TENNESSEE VALLEY TODAY AS FRONTAL BOUNDARY SHIFTS
SOUTHWARD. MOST UNSTABLE ATMOSPHERE EXPECTED OVER ALABAMA...THOUGH
MODELS INDICATE SOME WEAK TO MODERATE INSTABILITIES OVER
NORTH AND CENTRAL GEORGIA. PROVIDED ENOUGH MOISTURE ACROSS THE
AREA TODAY...THIS INSTABILITY IS ENOUGH TO PRODUCE ISOLATED
THUNDERSTORMS ESPECIALLY ACROSS WEST CENTRAL GEORGIA.
THUNDERSTORMS ARE EXPECTED TO REMAIN BELOW SEVERE LIMITS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY
THERE IS A CHANCE OF THUNDERSTORMS EACH DAY.

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

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
418 PM EDT THU AUG 11 2011

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

0200 PM     TSTM WND DMG     5 NW HAMILTON           32.81N 84.93W
08/11/2011                   HARRIS             GA   911 CALL CENTER

            HARRIS COUNTY 911 REPORTS SEVERAL DOWNED TREES IN THE
            NORTHWESTERN PORTION OF COUNTY.

0231 PM     TSTM WND DMG     1 NE WAVERLY HALL       32.69N 84.73W
08/11/2011                   HARRIS             GA   LAW ENFORCEMENT

            WAVERLY HALL POLICE DEPARTMENT REPORTS SEVERAL TREES AND
            LINES DOWN ON GA HWY 85 HEADING TOWARDS MANCHESTER.

0242 PM     HAIL             BOX SPRINGS             32.53N 84.66W
08/11/2011  U0.25 INCH       TALBOT             GA   POST OFFICE

            BOX SPRINGS POST OFFICE REPORTS HAIL OF UNKNOWN SIZE AND
            GUSTY WINDS.

0254 PM     TSTM WND DMG     2 ESE OAKLAND           32.45N 84.51W
08/11/2011                   MARION             GA   911 CALL CENTER

            MARION COUNTY 911 RELAYED REPORTS OF A COUPLE OF DOWNED
            TREES.

&&

RGARCIA

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
418 PM EDT THU AUG 11 2011

GAZ106-112045-
418 PM EDT THU AUG 11 2011

...SIGNIFICANT WEATHER ADVISORY FOR PEA SIZED HAIL...40 MPH WINDS
AND FREQUENT LIGHTNING IN SOUTHERN CRISP COUNTY UNTIL 445 PM EDT...

AT 417 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER FORT EARLY...MOVING SOUTHEAST AT 30 MPH.

THIS STORM HAS THE POTENTIAL TO PRODUCE PEA SIZED HAIL...FREQUENT
CLOUD TO GROUND LIGHTNING AND WIND GUSTS TO 40 MPH AS IT MOVES ACROSS
SOUTHERN CRISP COUNTY THROUGH 445 PM EDT. SOME LOCATIONS IN THE PATH
OF THIS STORM INCLUDE FORT EARLY...GEORGIA VETERANS MEMORIAL STATE
PARK...RAINES AND ARABI. BRIEF HEAVY DOWNPOURS WILL CAUSE PONDING OF
WATER ON ROADWAYS.

&&

LAT...LON 3183 8388 3184 8394 3185 8395 3190 8394
      3192 8392 3196 8393 3183 8360 3181 8361
      3180 8362 3180 8380
TIME...MOT...LOC 2018Z 298DEG 26KT 3186 8388

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