Alert archive / Georgia / Special Weather Statements in 2011

Special Weather Statement, NWS Atlanta, GA

September 5, 2011Hall County, Georgia

NWS Atlanta, GA issued this special weather statement at Sep 5, 2011, 9:12 PM EDT for Hall County, Georgia. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 5, 2011, 9:12 PM EDT (01:12 UTC)
Expired: Sep 5, 2011, 10:00 PM EDT
In force: 48 min
Issued by: NWS Atlanta, GA

County Hall County, GA

The radar

The Greer radar (KGSP), 143 km from the middle of the area, began a volume at 01:15 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 1.2 hours before the alert went out and 141 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1175 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 554 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 462 m²/s²
0-3 km storm-relative helicity: 542 m²/s²
Significant tornado parameter: 3.6
Supercell composite: 19.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Atlanta, GA wrote its last area forecast discussion before this special weather statement went out at Sep 5, 7:51 PM EDT, 1 hour 21 minutes earlier.

Area forecast discussion, Sep 5, 7:51 PM EDT, 1 hour 21 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
751 PM EDT MON SEP 5 2011

.PREV DISCUSSION... /ISSUED 416 PM EDT MON SEP 5 2011/

SHORT TERM /TONIGHT THROUGH WEDNESDAY NIGHT/...
STAYING BUSY WITH REMNANTS OF LEE. POP FORECAST STRAIGHT FORWARD
THROUGH THE NEXT 24 TO 36 HOURS OR SO...WITH CATEGORICAL POPS ACROSS
MUCH OF THE AREA. MODELED SHEAR STILL EXPECTED TO RISE AS LOW TRACKS
NORTHEAST INTO THE TN VALLEY THROUGH TOMORROW...AND INTERACTS WITH
FRONTAL BOUNDARY THERE. WITH SHEAR AND HELICITY INCREASING...EXPECT
ISOLATED TORNADOES TO CONTINUE TONIGHT AND INTO THE OVERNIGHT HOURS.
IN THIS ENVIRONMENT...TORNADOES WILL GENERALLY BE WEAK AND
SHORT-LIVED...AND MAY HAVE VERY SHORT LEAD TIMES. IT IS IMPORTANT TO
STAY UP TO DATE ON THE LATEST INFORMATION. AS OF 4 PM...MUCH OF
NORTH AND CENTRAL GEORGIA WAS UNDER A TORNADO WATCH UNTIL 11 PM
MONDAY.

HEAVY RAIN AND FLASH FLOODING CONTINUES TO BE A PRIMARY THREAT. SEE
THE HYDROLOGY SECTION BELOW FOR ADDITIONAL INFORMATION.
WINDS ARE EXPECTED TO BE JUST BELOW ADVISORY CRITERIA THROUGH
TUESDAY. HAVE GONE WITH 15 TO 20 MPH SUSTAINED WINDS...WITH GUSTS UP
TO 30 MPH THROUGH TUESDAY.

DRY SLOT PROGGED TO MOVE INTO GEORGIA TUESDAY MORNING...BUT BELIEVE
DEW POINTS TO BE A LITTLE TOO LOW. REMNANTS OF LEE TRACKS INTO THE
TN VALLEY BY EARLY WEDNESDAY...AND THEN INTO THE OHIO VALLEY BY
THURSDAY. THIS LOW DANCES AROUND THE MID WEST THROUGH THE REST OF
THE WEEK AS IT GETS ABSORBED INTO THE OVERALL FLOW WITH KATIA
APPROACHING. HAVE CONTINUED SLIGHT CHANCE TO CHANCE POPS ACROSS
NORTH GEORGIA THROUGH THE REMAINDER OF THE SHORT TERM AS MOISTURE
COULD REMAIN ACROSS PORTIONS OF NORTH GEORGIA. OVERALL QPF IS LOW.

TEMPERATURES CONTINUE TO BE BELOW NORMAL THROUGH THE SHORT TERM.
MODEL DEW POINTS SEEM A LITTLE LOW GIVEN THE PATH OF LEE...AND AS A
RESULT...BELIEVE GUIDANCE TEMPERATURES TO BE TOO LOW. HAVE SIDED
WITH WARMER THAN GUIDANCE TEMPERATURES FOR TUESDAY LOWS...AND CLOSER
TO THE LOCAL BIAS CORRECTED VALUES. MILD TEMPERATURES CONTINUE
TUESDAY AFTERNOON...WITH HIGHS IN THE 70S. EXPECT TO SEE COOLER LOWS
FOR WEDNESDAY MORNING...WITH LOWER DEW POINTS AND DRIER CONDITIONS
MORE APPROPRIATE.

31

LONG TERM /THURSDAY THROUGH MONDAY/...
UNSETTLED CONDITIONS EXPECTED FOR THE LONG TERM...ESPECIALLY ACROSS
NORTH GEORGIA WITH SEVERAL MODELS CONTINUING TO SHOW MOISTURE ACROSS
NORTH GEORGIA. EXTENDED MODELS SHOWING VARIOUS TROPICAL LOWS
DEVELOPING THROUGH THE WEEKEND AND INTO NEXT WEEK...BUT WILL HAVE TO
WAIT FOR BETTER MODEL CONSENSUS BEFORE WE CAN JUMP ON ANYTHING.

31

HYDROLOGY...
RAINFALL AMOUNTS OF 6-7 INCHES HAVE ALREADY OCCURRED IN PORTIONS OF
EXTREME NORTHWEST GEORGIA...AND LARGER AREA OF 2-4 FROM NORTH OF
ROME TO BLAIRSVILLE HAS BEEN OBSERVED. OUTSIDE OF THIS AREA...MOST
LOCATIONS HAVE SEEN AN INCH OR LESS. THAT BEING SAID...ADDITIONAL
RAINFALL OF 3-5 INCHES ARE POSSIBLE ACROSS NORTH GEORGIA...WITH 1-3
INCHES FROM A LAGRANGE TO MACON...TO AUGUSTA LINE. A FLASH FLOOD
WATCH REMAINS IN EFFECT THROUGH TUESDAY MORNING.

31

&&

.AVIATION...
00Z UPDATE...
BULK OF PRECIP SHIELD ACROSS NORTH GEORGIA...COULD STILL SEE RAND
BANDS MOVE ACROSS ANY TAF SITE THROUGH PERIOD. CONVECTION HAS
DIMINISHED AS WELL...BUT WILL CONTINUE TO MONITOR AND MAY NEED TO
ADD BACK IN LATER. WITH GOOD GROUND SATURATION OVER ALL TAF
SITES...MVFR/VFR CIGS SHOULD DETERIORATE TO IFR RAPIDLY AFTER
SUNSET. CIGS WILL SLOWLY LIFT TO MVFR BY TUESDAY AFTERNOON. WINDS
WILL BE MAINLY SSE...SHIFTING TO SSW BETWEEN 13-15Z. SPEEDS WILL
GENERALLY BE 7-12KTS WITH HIGHER GUSTS POSSIBLE THROUGH 00Z
WEDNESDAY.

//ATL CONFIDENCE...00Z UPDATE...
MEDIUM TO HIGH ON ALL ELEMENTS.

12

&&

.PRELIMINARY POINT TEMPS/POPS...
ATHENS          71  78  60  77 / 100  40  40  20
ATLANTA         69  72  59  74 / 100  40  20  20
BLAIRSVILLE     67  70  58  70 / 100  70  40  30
CARTERSVILLE    68  71  60  73 / 100  70  20  20
COLUMBUS        69  77  62  79 / 100  30  10  20
GAINESVILLE     70  74  59  73 / 100  60  40  20
MACON           73  79  60  80 / 100  30  20  20
ROME            68  71  61  75 / 100  80  30  20
PEACHTREE CITY  68  72  58  75 / 100  40  20  20
VIDALIA         75  87  62  82 /  80  60  20  10

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
TORNADO WATCH UNTIL 11 PM EDT THIS EVENING FOR THE FOLLOWING
ZONES: BALDWIN...BANKS...BARROW...BARTOW...BIBB...BLECKLEY...
BUTTS...CARROLL...CHATTAHOOCHEE...CHATTOOGA...CHEROKEE...
CLARKE...CLAYTON...COBB...COWETA...CRAWFORD...CRISP...DAWSON...
DEKALB...DOOLY...DOUGLAS...FAYETTE...FLOYD...FORSYTH...
GLASCOCK...GORDON...GREENE...GWINNETT...HALL...HANCOCK...
HARALSON...HARRIS...HEARD...HENRY...HOUSTON...JACKSON...JASPER...
JONES...LAMAR...LUMPKIN...MACON...MADISON...MARION...
MERIWETHER...MONROE...MORGAN...MUSCOGEE...NEWTON...NORTH
FULTON...OCONEE...OGLETHORPE...PAULDING...PEACH...PICKENS...
PIKE...POLK...PULASKI...PUTNAM...ROCKDALE...SCHLEY...SOUTH
FULTON...SPALDING...STEWART...SUMTER...TALBOT...TALIAFERRO...
TAYLOR...TOWNS...TROUP...TWIGGS...UNION...UPSON...WALTON...
WARREN...WASHINGTON...WEBSTER...WHITE...WILKES...WILKINSON.

FLASH FLOOD WATCH THROUGH TUESDAY MORNING 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...GREENE...GWINNETT...HALL...HARALSON...HEARD...
HENRY...JACKSON...JASPER...LUMPKIN...MADISON...MERIWETHER...
MORGAN...MURRAY...NEWTON...NORTH FULTON...OCONEE...OGLETHORPE...
PAULDING...PICKENS...PIKE...POLK...PUTNAM...ROCKDALE...SOUTH
FULTON...SPALDING...TALIAFERRO...TOWNS...TROUP...UNION...
WALKER...WALTON...WHITE...WHITFIELD...WILKES.

&&

12

Hazardous weather outlook, Sep 5, 4:58 PM EDT, 4 hours 14 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
458 PM EDT MON SEP 5 2011

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-062100-
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-
458 PM EDT MON SEP 5 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH AND CENTRAL GEORGIA.

.DAY ONE...TONIGHT
HEAVY RAIN AND ISOLATED TORNADOES ARE EXPECTED ACROSS PORTIONS OF
NORTH AND CENTRAL GEORGIA THROUGH TONIGHT.

.SYNOPSIS...
TROPICAL DEPRESSION LEE WILL MOVE SLOWLY NORTHEAST THROUGH TONIGHT AS A
COLD FRONT APPROACHES NORTH GEORGIA.

.PRIMARY HAZARDS...
THE PRIMARY HAZARDS WILL BE HEAVY RAIN AND ISOLATED TORNADOES ACROSS
NORTH AND CENTRAL GEORGIA. THE MOST LIKELY AREA FOR HEAVY RAIN
WILL BE NORTH OF A LINE FROM LAGRANGE TO EATONTON TO WASHINGTON.

.DISCUSSION...
THE EFFECTS OF TROPICAL DEPRESSION LEE WILL CONTINUE TO SPREAD
NORTHEAST ACROSS CENTRAL AND NORTH GEORGIA THROUGH TONIGHT WITH
DEEP TROPICAL MOISTURE AND MODERATE TO STRONG LOW LEVEL SHEAR.
WITH THE TROPICAL ATMOSPHERE IN PLACE...RAINFALL WILL BE HEAVY AT
TIMES. NORTH AND PORTIONS OF CENTRAL GEORGIA WILL RECEIVE AN
ADDITIONAL 3 TO 5 INCHES OF RAINFALL WHICH WILL RESULT IN INCREASING
RUNOFF AND POSSIBLE FLOODING ON CREEKS AND STREAMS. INSTABILITY IS
NOT EXPECTED TO BE HIGH...HOWEVER THE INCREASING LOW LEVEL SHEAR
WILL MAKE ISOLATED TORNADOES POSSIBLE THROUGH TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY
THERE IS A CHANCE OF THUNDERSTORMS EACH DAY...EXCEPT THURSDAY.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS REQUESTED FOR THIS EVENING ACROSS NORTH AND
CENTRAL GEORGIA.

In the hours before

Local storm report, Sep 5, 7:03 PM EDT, 2 hours 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
703 PM EDT MON SEP 05 2011

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

0650 PM     TSTM WND DMG     W VARNELL               34.90N 84.98W
09/05/2011                   WHITFIELD          GA   EMERGENCY MNGR

            WHITFIELD COUNTY EMERGENCY MANAGEMENT RELAYED A REPORT OF
            A TREE DOWNED ONTO A HOUSE CAUSING HEAVY STRUCTURAL
            DAMAGE.

&&

RGARCIA

Local storm report, Sep 5, 7:09 PM EDT, 2 hours 3 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
709 PM EDT MON SEP 05 2011

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

0650 PM     TSTM WND DMG     W VARNELL               34.90N 84.98W
09/05/2011                   WHITFIELD          GA   EMERGENCY MNGR

            WHITFIELD COUNTY EMERGENCY MANAGEMENT RELAYED A REPORT OF
            A TREE DOWNED ONTO A HOUSE CAUSING STRUCTURAL DAMAGE.

&&

RGARCIA

Special weather statement, Sep 5, 7:21 PM EDT, 1 hour 51 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
721 PM EDT MON SEP 5 2011

GAZ013-014-021-060000-
721 PM EDT MON SEP 5 2011

...SIGNIFICANT WEATHER ADVISORY FOR 40 MPH WINDS IN PICKENS...
CHEROKEE AND DAWSON COUNTIES UNTIL 800 PM EDT...

AT 718 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER HICKORY FLAT...MOVING NORTH AT 45 MPH.

THIS STORM HAS THE POTENTIAL TO PRODUCE WIND GUSTS TO 40 MPH AS IT
MOVES ACROSS PICKENS...CHEROKEE AND DAWSON COUNTIES THROUGH 800 PM
EDT. SOME LOCATIONS IN THE PATH OF THIS STORM INCLUDE HOLLY
SPRINGS...BUFFINGTON...CANTON...UNION HILL...HICKORY FLAT...FREE
HOME...LATHEMTOWN...BALL GROUND...REAVIS
MOUNTAIN...NELSON...TATE...MARBLEHILL...LAKE TAMARACK AND FAUSETT
LAKE. HEAVY DOWNPOURS WILL CAUSE PONDING OF WATER ON ROADWAYS.

&&

LAT...LON 3451 8423 3419 8430 3419 8433 3417 8436
      3413 8436 3412 8438 3415 8453 3454 8441
      3456 8430
TIME...MOT...LOC 2321Z 194DEG 41KT 3422 8439

Local storm report, Sep 5, 7:55 PM EDT, 1 hour 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
755 PM EDT MON SEP 05 2011

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

0503 PM     FLASH FLOOD      2 W TRENTON             34.87N 85.54W
09/05/2011                   DADE               GA   FIRE DEPT/RESCUE

            TRENTON FIRE DEPARTMENT RESCUED A FAMILY TRAPPED IN THEIR
            HOME BY FLOOD WATERS ON GA HWY 136.

&&

RGARCIA

Local storm report, Sep 5, 9:04 PM EDT, 8 minutes before

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Special weather statement, Sep 5, 9:12 PM EDT, 0 minutes before

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The office that day

Everything else NWS Atlanta, GA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 5, 8:44 PM EDT	Areal Flood Warning	FFC	Catoosa, Dade, Walker	12 hr
Sep 5, 9:24 PM EDT	Wind Advisory	FFC	Bartow, Catoosa, Chattooga, Cherokee, Dade, Fannin and 7 more	12 hr
Sep 5, 9:44 PM EDT	River Flood Warning	FFC	Catoosa	58 hr
Sep 6, 5:02 AM EDT	River Flood Warning	FFC	Whitfield	63 hr
Sep 6, 4:40 PM EDT	River Flood Warning	FFC	Murray, Whitfield	16 hr

Nearby

Special Weather Statements in Georgia, 2011 Every special weather statement in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.