Alert archive / Georgia / Special Weather Statements in 2012

Special Weather Statement, NWS Atlanta, GA

September 18, 2012Marion County, Schley County, Webster County, Georgia

NWS Atlanta, GA issued this special weather statement at Sep 18, 2012, 7:18 AM EDT for Marion County, Schley County, Webster County, Georgia. It was in force for 42 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 18, 2012, 7:18 AM EDT (11:18 UTC)
Expired
Sep 18, 2012, 8:00 AM EDT
In force
42 min
Issued by
NWS Atlanta, GA

Counties Marion County, GA, Schley County, GA, Webster County, GA

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 11.3 hours before the alert went out and 144 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-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 00:00Z on 2012-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 405 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 00:00Z on 2012-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 220 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
405 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
706 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
220 m²/s²
0-3 km storm-relative helicity
203 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.2

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 18, 3:42 AM EDT, 3 hours 36 minutes earlier.

Area forecast discussion, Sep 18, 3:42 AM EDT, 3 hours 36 minutes before
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Hazardous weather outlook, Sep 18, 5:10 AM EDT, 2 hours 8 minutes before
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In the hours before

Special weather statement, Sep 18, 6:25 AM EDT, 53 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
625 AM EDT TUE SEP 18 2012

GAZ011-019-181130-
625 AM EDT TUE SEP 18 2012

...SIGNIFICANT WEATHER ADVISORY FOR 40 MPH WINDS IN CHATTOOGA AND
FLOYD COUNTIES UNTIL 730 AM EDT...

AT 614 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 25 MILES SOUTHWEST OF CHATTOOGAVILLE...MOVING
NORTHEAST AT 35 MPH.

THE LEADING EDGE OF THIS LINE OF STORMS HAS EXHIBITED AREAS OF
LOCALIZED...WEAK ROTATION...BUT NOTHING STRONG ENOUGH TO INDICATE THE
PRESENCE OF A TORNADO AT 614 AM EDT. WIND GUSTS TO 40 MPH ARE ALSO
POSSIBLE AS THE LINE MOVES ACROSS CHATTOOGA AND FLOYD COUNTIES
THROUGH 730 AM EDT.

SOME LOCATIONS IN THE PATH OF THESE STORMS INCLUDE COOSA...
CHATTOOGAVILLE...LYERLY...MENLO...HOLLAND...BERRYTON...JAMES H. FLOYD
STATE PARK...SUMMERVILLE...ARMUCHEE...TIDINGS AND TRION.

EVERYONE IN THIS AREA IS URGED TO REMAIN INDOORS AND BE ALERT TO THE
POSSIBILITY OF LOCALIZED WIND DAMAGE.

&&

LAT...LON 3459 8538 3453 8513 3432 8512 3416 8544
      3417 8545 3447 8551
TIME...MOT...LOC 1024Z 230DEG 30KT 3415 8570
Special weather statement, Sep 18, 7:18 AM EDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
718 AM EDT TUE SEP 18 2012

GAZ090>092-102>104-181200-
718 AM EDT TUE SEP 18 2012

...SIGNIFICANT WEATHER ADVISORY FOR AN ENHANCED RISK OF BRIEF
TORNADOES AND 40 MPH WINDS IN WEBSTER...SUMTER...STEWART...SCHLEY...
MARION AND CHATTAHOOCHEE COUNTIES UNTIL 800 AM EDT...

AT 658 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 6 MILES WEST OF TROUTMAN...MOVING NORTHEAST AT 40
MPH.

THE LEADING EDGE OF THIS AREA OF STORMS HAS EXHIBITED AREAS OF
LOCALIZED...WEAK ROTATION...BUT NOTHING STRONG ENOUGH TO INDICATE THE
PRESENCE OF A TORNADO AT 658 AM EDT. STILL...THE ENVIRONMENT ALONG
THIS LINE SUGGESTS AN ENHANCED RISK OF A BRIEF...GENERALLY WEAK...
TORNADO FORMING. WIND GUSTS TO 40 MPH ARE ALSO POSSIBLE AS THE LINE
MOVES ACROSS WEBSTER...SUMTER...STEWART...SCHLEY...MARION AND
CHATTAHOOCHEE COUNTIES THROUGH 800 AM EDT.

SOME LOCATIONS IN THE PATH OF THESE STORMS INCLUDE KIMBROUGH...
WESTON...WESTVILLE...TROUTMAN...BROOKLYN...RICHLAND...LUMPKIN...
PRESTON...SEMINOLE...CHURCH HILL...DRANEVILLE...FRIENDSHIP...
CONCORD...BUENA VISTA AND PUTNAM.

EVERYONE IN THIS AREA IS URGED TO REMAIN INDOORS AND BE ALERT TO THE
POSSIBILITY OF LOCALIZED WIND DAMAGE AND WEAK TORNADOES THAT FORM AND
DISSIPATE RAPIDLY. ONCE THIS LINE OF THUNDERSTORMS MOVES EAST OF YOUR
AREA...THE RISK OF TORNADO FORMATION WILL DECREASE SIGNIFICANTLY.

&&

LAT...LON 3194 8496 3240 8449 3234 8429 3226 8423
      3191 8467 3192 8468 3191 8482
TIME...MOT...LOC 1118Z 228DEG 34KT 3205 8464

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 18, 12:21 AM EDTSpecial Weather StatementFFCJohnson, Laurens, Wilkinson24 min
Sep 18, 1:06 AM EDTSpecial Weather StatementFFCDade54 min
Sep 18, 3:27 AM EDTRiver Flood WarningFFCDade15 hr
Sep 18, 6:25 AM EDTSpecial Weather StatementFFCChattooga65 min
Sep 18, 7:52 AM EDTSpecial Weather StatementFFCCrawford, Macon, Peach, Schley38 min
Sep 18, 8:22 AM EDTSpecial Weather StatementFFCBaldwin, Jones23 min
Sep 18, 11:33 AM EDTSpecial Weather StatementFFCCoweta, Troup27 min
Sep 18, 11:57 AM EDTSpecial Weather StatementFFCClayton, Coweta, Fayette33 min
Sep 18, 1:29 PM EDTSpecial Weather StatementFFCButts, Spalding46 min
Sep 18, 2:16 PM EDTSpecial Weather StatementFFCMonroe, Upson29 min
Sep 18, 2:46 PM EDTSpecial Weather StatementFFCBibb, Jones, Monroe29 min
Sep 18, 3:42 PM EDTSpecial Weather StatementFFCHancock, Putnam48 min

Nearby

Special Weather Statements in Georgia, 2012Every special weather statement in 2012

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.