Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 328, NWS Atlanta, GA

August 3, 20125 counties in Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Aug 3, 2012, 7:44 PM EDT for 5 counties in Georgia. It was in force for 46 min. 3 reports 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: Aug 3, 2012, 7:44 PM EDT (23:44 UTC)
Expired: Aug 3, 2012, 8:30 PM EDT
In force: 46 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Clayton County, GA, DeKalb County, GA, Fayette County, GA, Fulton County, GA, Henry County, GA

The radar

The Atlanta radar (KFFC), 38 km from the middle of the area, began a volume at 23:44 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
Aug 3, 7:50 PM EDT	TSTM WND DMG	1 N Fayetteville, GA	NUMEROUS POWERLINES REPORTED DOWN ALONG HIGHWAY 85 IN EASTERN PORTIONS OF THE COUNTY.
Aug 3, 7:55 PM EDT	TSTM WND DMG	3 Nne Fayetteville, GA	EMERGENCY MANAGER REPORTS SEVERAL ROOFS OFF BUSINESSES AT 1583 NORTH HIGHWAY 85.
Aug 3, 8:00 PM EDT	TSTM WND DMG	Fayetteville, GA	ROOFS BLOWN OFF OF 3 TO 4 BUSINESS ON THE NORTH END OF FAYETTEVILLE ALONG HIGHWAY 85.

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, 11.7 hours before the alert went out and 33 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: 115 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 833 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 45 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.

025 
WUUS52 KFFC 032344
SVRFFC
GAC063-089-113-121-151-040030-
/O.NEW.KFFC.SV.W.0328.120803T2344Z-120804T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
744 PM EDT FRI AUG 3 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLAYTON COUNTY IN NORTH CENTRAL GEORGIA
  SOUTHWESTERN DEKALB COUNTY IN NORTH CENTRAL GEORGIA
  NORTHEASTERN FAYETTE COUNTY IN NORTH CENTRAL GEORGIA
  SOUTH CENTRAL FULTON COUNTY IN NORTH CENTRAL GEORGIA
  NORTHWESTERN HENRY COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 830 PM EDT

* AT 744 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZED
  HAIL...AND DAMAGING WINDS UP TO 60 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM RIVERDALE TO JONESBORO TO 7 MILES
  SOUTHWEST OF LOVEJOY...MOVING NORTHEAST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MORROW...FOREST PARK...LAKE CITY AND STOCKBRIDGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU SEE WIND DAMAGE...HAIL OR 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. YOU CAN ALSO TWEET YOUR REPORT USING HASHTAG GAWX.

&&

LAT...LON 3375 8424 3364 8412 3363 8412 3365 8418
      3356 8412 3347 8413 3338 8443 3343 8444
      3356 8454
TIME...MOT...LOC 2345Z 232DEG 14KT 3353 8443 3346 8440
          3338 8441

$$

1 follow-up statement

154 
WWUS52 KFFC 040019
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
819 PM EDT FRI AUG 3 2012

GAC063-089-113-121-151-040030-
/O.CON.KFFC.SV.W.0328.000000T0000Z-120804T0030Z/
DEKALB GA-FAYETTE GA-HENRY GA-CLAYTON GA-FULTON GA-
819 PM EDT FRI AUG 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR SOUTH CENTRAL FULTON...CLAYTON...NORTHWESTERN HENRY...
NORTHEASTERN FAYETTE AND SOUTHWESTERN DEKALB COUNTIES...

AT 817 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZED HAIL...AND DAMAGING WINDS UP TO 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM FORT GILLEM TO LAKE SPIVEY TO
LOVEJOY...MOVING NORTHEAST AT 15 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
CONLEY...ELLENWOOD...REX...CEDAR GROVE...SNAPFINGER...
PANTHERSVILLE...HIDDEN VALLEY PARK...EAGLES LANDING...FLIPPEN AND
STOCKBRIDGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU SEE WIND DAMAGE...HAIL OR 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. YOU CAN ALSO TWEET YOUR REPORT USING HASHTAG GAWX.

&&

LAT...LON 3375 8424 3365 8415 3363 8413 3365 8418
      3359 8415 3356 8412 3347 8413 3340 8437
      3355 8447
TIME...MOT...LOC 0019Z 232DEG 14KT 3361 8430 3354 8427
          3346 8429

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 8:05 PM EDT	Flash Flood Warning	FFC	DeKalb, Fulton	4 hr
Aug 2, 8:53 PM EDT	Special Weather Statement	FFC	Spalding	52 min
Aug 3, 5:35 PM EDT	Special Weather Statement	FFC	Cobb	40 min
Aug 3, 6:11 PM EDT	Special Weather Statement	FFC	Union	34 min
Aug 3, 6:42 PM EDT	Special Weather Statement	FFC	DeKalb, Gwinnett	33 min
Aug 3, 6:51 PM EDT	Severe Thunderstorm Warning	FFC	DeKalb, Gwinnett, Rockdale, Walton	39 min
Aug 3, 7:36 PM EDT	Special Weather Statement	FFC	Fayette	39 min
Aug 3, 7:59 PM EDT	Special Weather Statement	FFC	Gwinnett	46 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2012 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.