Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 430, NWS Atlanta, GA

July 5, 2011Barrow County, Gwinnett County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 5, 2011, 7:58 PM EDT for Barrow County, Gwinnett County, Georgia. It was in force for 47 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 5, 2011, 7:58 PM EDT (23:58 UTC)
Expired: Jul 5, 2011, 8:45 PM EDT
In force: 47 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Barrow County, GA, Gwinnett County, GA

The radar

The Atlanta radar (KFFC), 105 km from the middle of the area, began a volume at 00:01 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.

What was reported inside it

Time	Report	Where	Remark
Jul 5, 8:10 PM EDT	TSTM WND DMG	Winder, GA	SEVERAL TREES AND A FEW POWER LINES DOWN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 12.0 hours before the alert went out and 100 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: 57 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 939 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 18 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.

695 
WUUS52 KFFC 052358
SVRFFC
GAC013-135-060045-
/O.NEW.KFFC.SV.W.0430.110705T2358Z-110706T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
758 PM EDT TUE JUL 5 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BARROW COUNTY IN NORTH CENTRAL GEORGIA
  SOUTHEASTERN GWINNETT COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 845 PM EDT

* AT 753 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 DACULA...
  MOVING NORTHEAST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  AUBURN...CARL...BETHLEHEM...WINDER AND STATHAM.

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 3407 8377 3407 8374 3405 8371 3406 8370
      3405 8369 3405 8366 3398 8357 3397 8357
      3390 8375 3393 8380 3386 8389 3393 8396
      3412 8382
TIME...MOT...LOC 2359Z 236DEG 7KT 3394 8383

$$

2 follow-up statements

928 
WWUS52 KFFC 060008
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
808 PM EDT TUE JUL 5 2011

GAC013-135-060045-
/O.CON.KFFC.SV.W.0430.000000T0000Z-110706T0045Z/
BARROW GA-GWINNETT GA-
808 PM EDT TUE JUL 5 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR SOUTHEASTERN GWINNETT AND BARROW COUNTIES...

AT 803 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 
HARBIN...MOVING NORTHEAST AT 10 MPH. 

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
AUBURN...CARL...BETHLEHEM...FORT YARGO STATE PARK...CHATEAU ELAN...
COUNTY LINE...WINDER...THOMPSONS MILL...STATHAM AND RUSSELL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE CLOUD-TO-GROUND LIGHTNING IS OCCURRING WITH THESE 
THUNDERSTORMS. MOVE INDOORS IMMEDIATELY! LIGHTNING IS ONE OF NATURES 
NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE 
CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. RESIDENTS IN THE AREA SHOULD 
REMAIN INDOORS AND AWAY FROM ELECTRICAL APPLIANCES...DOORS...AND 
WINDOWS UNTIL THE STORMS HAVE PASSED. LAND-LINE TELEPHONES SHOULD 
ONLY BE USED IN AN EMERGENCY.

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 3407 8377 3407 8374 3405 8371 3406 8370
      3405 8369 3405 8366 3398 8357 3397 8357
      3390 8375 3393 8380 3386 8389 3393 8396
      3412 8382
TIME...MOT...LOC 0008Z 236DEG 7KT 3395 8381

$$



19

501 
WWUS52 KFFC 060047
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
847 PM EDT TUE JUL 5 2011

GAC013-135-060056-
/O.EXP.KFFC.SV.W.0430.000000T0000Z-110706T0045Z/
BARROW GA-GWINNETT GA-
847 PM EDT TUE JUL 5 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN GWINNETT AND
BARROW COUNTIES EXPIRED AT 845 PM EDT...

AT 841 PM EDT...ALTHOUGH SEVERE THUNDERSTORMS ARE NO LONGER 
INDICATED IN GWINNETT OR BARROW COUNTIES AT THIS TIME...STRONG 
THUNDERSTORMS WITH FREQUENT CLOUD-TO-GROUND LIGHTNING...HEAVY 
RAIN...AND WIND GUSTS OF 40 TO 45 MPH WILL REMAIN POSSIBLE ACROSS 
NORTHERN AND EASTERN GWINNETT AND MUCH OF BARROW COUNTIES THROUGH 
915 PM EDT.

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 3407 8377 3407 8374 3405 8371 3406 8370
      3405 8369 3405 8366 3398 8357 3397 8357
      3390 8375 3393 8380 3386 8389 3393 8396
      3412 8382
TIME...MOT...LOC 0008Z 236DEG 7KT 3395 8381

$$



19

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 8:34 PM EDT	Special Weather Statement	FFC	Douglas, Fulton	26 min
Jul 4, 8:38 PM EDT	Special Weather Statement	FFC	Bartow, Cherokee, Cobb, Paulding	52 min
Jul 4, 9:00 PM EDT	Special Weather Statement	FFC	Pulaski	30 min
Jul 4, 9:08 PM EDT	Special Weather Statement	FFC	Clayton, Douglas, Fulton	37 min
Jul 5, 2:56 PM EDT	Special Weather Statement	FFC	White	34 min
Jul 5, 2:58 PM EDT	Special Weather Statement	FFC	Heard	32 min
Jul 5, 3:25 PM EDT	Special Weather Statement	FFC	Lumpkin, White	35 min
Jul 5, 3:27 PM EDT	Special Weather Statement	FFC	Coweta	33 min
Jul 5, 3:40 PM EDT	Special Weather Statement	FFC	Fannin	35 min
Jul 5, 3:53 PM EDT	Special Weather Statement	FFC	Coweta, Heard	37 min
Jul 5, 3:55 PM EDT	Special Weather Statement	FFC	Lumpkin, Union, White	35 min
Jul 5, 5:51 PM EDT	Special Weather Statement	FFC	Toombs	24 min
Jul 5, 6:09 PM EDT	Severe Thunderstorm Warning	FFC	Toombs	36 min
Jul 5, 6:46 PM EDT	Special Weather Statement	FFC	Madison	29 min
Jul 5, 7:17 PM EDT	Special Weather Statement	FFC	Carroll	43 min
Jul 5, 7:26 PM EDT	Special Weather Statement	FFC	Barrow	34 min
Jul 5, 7:34 PM EDT	Special Weather Statement	FFC	Haralson	26 min
Jul 5, 7:39 PM EDT	Special Weather Statement	FFC	DeKalb	36 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2011 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.