Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 123, NWS Atlanta, GA

May 21, 2012Gwinnett County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at May 21, 2012, 6:46 PM EDT for Gwinnett County, Georgia. It was in force for 44 min. 2 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: May 21, 2012, 6:46 PM EDT (22:46 UTC)
Expired: May 21, 2012, 7:30 PM EDT
In force: 44 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

County Gwinnett County, GA

The radar

The Atlanta radar (KFFC), 95 km from the middle of the area, began a volume at 22:49 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
May 21, 6:50 PM EDT	TSTM WND DMG	2 E Suwanee, GA	PUBLIC REPORTED SEVERAL TREES DOWN/SNAPPED AT HIS RESIDENCE.
May 21, 7:19 PM EDT	TSTM WND DMG	Suwanee, GA	THE WAS A POWER OUTAGE REPORTED IN THE CITY OF SUWANEE.

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, 10.8 hours before the alert went out and 91 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1679 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 80 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.

892 
WUUS52 KFFC 212246
SVRFFC
GAC135-212330-
/O.NEW.KFFC.SV.W.0123.120521T2246Z-120521T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
646 PM EDT MON MAY 21 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

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

* UNTIL 730 PM EDT

* AT 644 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 SUGAR
  HILL...MOVING SOUTHEAST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SUWANEE...BUFORD...REST HAVEN...LAWRENCEVILLE...GRAYSON AND DACULA.

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 3410 8388 3411 8384 3410 8382 3401 8387
      3396 8383 3386 8391 3403 8414 3405 8410
      3407 8412 3415 8409 3417 8406
TIME...MOT...LOC 2246Z 308DEG 5KT 3409 8405

$$

1 follow-up statement

495 
WWUS52 KFFC 212303
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
703 PM EDT MON MAY 21 2012

GAC135-212330-
/O.CON.KFFC.SV.W.0123.000000T0000Z-120521T2330Z/
GWINNETT GA-
703 PM EDT MON MAY 21 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NORTHERN GWINNETT COUNTY...

AT 658 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
SUWANEE...MOVING SOUTHEAST AT 5 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO REST
HAVEN...HARBIN...HOG MOUNTAIN...LAWRENCEVILLE...GRAYSON AND DACULA.

THE PUBLIC HAS REPORTED PEA SIZED HAIL IN THE SUWANEE AREA WITH THIS 
STORM.

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 3410 8388 3411 8384 3410 8382 3401 8387
      3396 8383 3386 8391 3403 8414 3405 8410
      3407 8412 3415 8409 3417 8406
TIME...MOT...LOC 2302Z 308DEG 5KT 3405 8407

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 8:04 PM EDT	Special Weather Statement	FFC	Forsyth	26 min
May 21, 2:22 PM EDT	Special Weather Statement	FFC	Paulding	23 min
May 21, 2:27 PM EDT	Special Weather Statement	FFC	Towns	33 min
May 21, 2:44 PM EDT	Special Weather Statement	FFC	Paulding	31 min
May 21, 2:53 PM EDT	Special Weather Statement	FFC	Towns	22 min
May 21, 2:59 PM EDT	Special Weather Statement	FFC	Carroll	31 min
May 21, 3:12 PM EDT	Special Weather Statement	FFC	White	33 min
May 21, 3:15 PM EDT	Special Weather Statement	FFC	Douglas	30 min
May 21, 3:30 PM EDT	Special Weather Statement	FFC	Troup	30 min
May 21, 3:41 PM EDT	Special Weather Statement	FFC	Cobb, Coweta, Douglas, Fulton	34 min
May 21, 3:48 PM EDT	Special Weather Statement	FFC	Heard	12 min
May 21, 3:56 PM EDT	Special Weather Statement	FFC	Troup	34 min
May 21, 4:05 PM EDT	Special Weather Statement	FFC	Troup	25 min
May 21, 4:14 PM EDT	Special Weather Statement	FFC	Clayton, Coweta, DeKalb, Douglas, Fayette, Fulton	31 min
May 21, 4:18 PM EDT	Special Weather Statement	FFC	Fannin	27 min
May 21, 4:26 PM EDT	Special Weather Statement	FFC	Meriwether, Troup	34 min
May 21, 4:28 PM EDT	Special Weather Statement	FFC	Stewart	32 min
May 21, 4:38 PM EDT	Special Weather Statement	FFC	Fannin	37 min
May 21, 4:42 PM EDT	Special Weather Statement	FFC	Clayton, DeKalb, Fayette, Pike, Spalding	33 min
May 21, 4:44 PM EDT	Special Weather Statement	FFC	Gordon	31 min
May 21, 5:03 PM EDT	Special Weather Statement	FFC	Troup	27 min
May 21, 5:08 PM EDT	Special Weather Statement	FFC	Pike	37 min
May 21, 5:10 PM EDT	Special Weather Statement	FFC	DeKalb, Henry, Rockdale	35 min
May 21, 5:12 PM EDT	Special Weather Statement	FFC	Gordon	33 min
May 21, 5:27 PM EDT	Special Weather Statement	FFC	Gwinnett	33 min
May 21, 5:31 PM EDT	Special Weather Statement	FFC	Butts, Henry	14 min
May 21, 5:49 PM EDT	Special Weather Statement	FFC	Newton	41 min
May 21, 5:52 PM EDT	Special Weather Statement	FFC	Gwinnett	23 min
May 21, 5:55 PM EDT	Special Weather Statement	FFC	Heard	35 min
May 21, 5:57 PM EDT	Special Weather Statement	FFC	Cherokee	33 min
May 21, 6:05 PM EDT	Special Weather Statement	FFC	Forsyth	25 min
May 21, 6:20 PM EDT	Special Weather Statement	FFC	Walton	25 min
May 21, 6:33 PM EDT	Special Weather Statement	FFC	Lumpkin	27 min
May 21, 6:38 PM EDT	Special Weather Statement	FFC	Gwinnett	37 min
May 21, 6:52 PM EDT	Special Weather Statement	FFC	Forsyth	38 min
May 21, 6:55 PM EDT	Special Weather Statement	FFC	Carroll, Douglas	35 min
May 21, 6:56 PM EDT	Special Weather Statement	FFC	Lumpkin	34 min
May 21, 7:16 PM EDT	Severe Thunderstorm Warning	FFC	Douglas	28 min
May 21, 7:18 PM EDT	Severe Thunderstorm Warning	FFC	DeKalb, Fulton, Gwinnett	42 min
May 21, 7:21 PM EDT	Severe Thunderstorm Warning	FFC	Cobb	39 min
May 21, 7:25 PM EDT	Special Weather Statement	FFC	Floyd, Polk	35 min
May 21, 7:35 PM EDT	Special Weather Statement	FFC	Haralson	25 min
May 21, 7:37 PM EDT	Special Weather Statement	FFC	Banks	23 min
May 21, 7:49 PM EDT	Special Weather Statement	FFC	Douglas	26 min
May 21, 7:53 PM EDT	Severe Thunderstorm Warning	FFC	Cobb, Douglas, Fulton	40 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.