Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 439, NWS Atlanta, GA

July 12, 2011Clayton County, Henry County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 12, 2011, 2:52 PM EDT for Clayton County, Henry County, Georgia. It was in force for 23 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
Jul 12, 2011, 2:52 PM EDT (18:52 UTC)
Expired
Jul 12, 2011, 3:15 PM EDT
In force
23 min
Issued by
NWS Atlanta, GA
Area
Storm-based polygon

Counties Clayton County, GA, Henry County, GA

The radar

The Atlanta radar (KFFC), 29 km from the middle of the area, began a volume at 18:54 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 12:00Z, 6.9 hours before the alert went out and 24 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 12:00Z on 2011-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2178 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 12:00Z on 2011-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 square meters per square second.1939Sfc1 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
2178 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
1004 m above ground
0-6 km bulk shear
1 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
2 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

236 
WUUS52 KFFC 121852
SVRFFC
GAC063-151-121915-
/O.NEW.KFFC.SV.W.0439.110712T1852Z-110712T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
252 PM EDT TUE JUL 12 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CLAYTON COUNTY IN NORTH CENTRAL GEORGIA
  CENTRAL HENRY COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 315 PM EDT

* AT 249 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZED HAIL...AND
  DAMAGING WINDS UP TO 60 MPH.  THIS STORM WAS LOCATED NEAR
  LOVEJOY...MOVING EAST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HAMPTON...STOCKBRIDGE AND MCDONOUGH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

IF YOU SEE WIND DAMAGE...LARGE HAIL OR SIGNIFICANT FLOODING...WAIT
UNTIL THE STORM HAS PASSED...AND THEN CALL THE NATIONAL WEATHER
SERVICE TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.

&&

LAT...LON 3360 8415 3356 8413 3357 8410 3338 8408
      3338 8439 3343 8440 3345 8438 3347 8438
      3350 8443 3351 8442 3352 8443 3355 8444
TIME...MOT...LOC 1852Z 264DEG 9KT 3347 8432

$$
1 follow-up statement
614 
WWUS52 KFFC 121908
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
308 PM EDT TUE JUL 12 2011

GAC063-151-121915-
/O.CON.KFFC.SV.W.0439.000000T0000Z-110712T1915Z/
HENRY GA-CLAYTON GA-
308 PM EDT TUE JUL 12 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR SOUTHERN CLAYTON AND WESTERN HENRY COUNTIES...

AT 303 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZED
HAIL...AND DAMAGING WINDS UP TO 60 MPH. THIS STORM WAS LOCATED NEAR
LOVEJOY...MOVING SOUTHEAST AT 5 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ATLANTA
MOTOR SPEEDWAY AND HAMPTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU SEE WIND DAMAGE...LARGE HAIL OR SIGNIFICANT FLOODING...WAIT
UNTIL AFTER THE STORM HAS PASSED...AND THEN CALL THE NATIONAL WEATHER
SERVICE TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.

&&

LAT...LON 3359 8423 3339 8417 3338 8439 3342 8440
      3345 8438 3349 8441 3350 8443
TIME...MOT...LOC 1908Z 315DEG 5KT 3346 8429

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 9:18 PM EDTSpecial Weather StatementFFCGordon27 min
Jul 11, 9:22 PM EDTSevere Thunderstorm WarningFFCGordon23 min
Jul 11, 9:48 PM EDTSpecial Weather StatementFFCFloyd27 min
Jul 11, 9:57 PM EDTSpecial Weather StatementFFCGordon33 min
Jul 11, 9:59 PM EDTSpecial Weather StatementFFCGordon31 min
Jul 11, 10:33 PM EDTSpecial Weather StatementFFCGordon57 min
Jul 12, 8:56 AM EDTSpecial Weather StatementFFCBartow34 min
Jul 12, 11:54 AM EDTSpecial Weather StatementFFCHaralson36 min
Jul 12, 1:42 PM EDTSpecial Weather StatementFFCDouglas33 min
Jul 12, 1:50 PM EDTSpecial Weather StatementFFCRockdale40 min
Jul 12, 1:55 PM EDTSevere Thunderstorm WarningFFCDade, Walker35 min
Jul 12, 2:11 PM EDTSpecial Weather StatementFFCRockdale34 min
Jul 12, 2:30 PM EDTSpecial Weather StatementFFCClayton30 min
Jul 12, 2:44 PM EDTSpecial Weather StatementFFCChattooga31 min
Jul 12, 3:04 PM EDTSpecial Weather StatementFFCGwinnett26 min
Jul 12, 3:08 PM EDTHeat AdvisoryFFCBaldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 75 more37 hr
Jul 12, 3:13 PM EDTSpecial Weather StatementFFCDeKalb32 min
Jul 12, 3:16 PM EDTSpecial Weather StatementFFCFayette29 min
Jul 12, 3:21 PM EDTSevere Thunderstorm WarningFFCCoweta, Fayette39 min
Jul 12, 3:32 PM EDTSevere Thunderstorm WarningFFCFulton30 min
Jul 12, 3:41 PM EDTSpecial Weather StatementFFCGwinnett49 min
Jul 12, 4:09 PM EDTSpecial Weather StatementFFCCoweta36 min
Jul 12, 4:23 PM EDTSpecial Weather StatementFFCMeriwether37 min
Jul 12, 4:35 PM EDTSpecial Weather StatementFFCMeriwether25 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2011Every severe thunderstorm warning 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.