Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 137, NWS Atlanta, GA

May 29, 20124 counties in Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at May 29, 2012, 11:29 PM EDT for 4 counties in Georgia. It was in force for 46 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 29, 2012, 11:29 PM EDT (03:29 UTC)
Expired: May 30, 2012, 12:15 AM EDT
In force: 46 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Bartow County, GA, Cherokee County, GA, Cobb County, GA, Paulding County, GA

The radar

The Atlanta radar (KFFC), 93 km from the middle of the area, began a volume at 03:33 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 29, 11:30 PM EDT	TSTM WND DMG	Cartersville, GA	BARTOW COUNTY 911 RELAYED REPORTS OF SEVERAL DOWNED TREES...ALONG WITH POSSIBLE ROOF DAMAGE TO A STRUCTURE IN CARTERSVILLE ON EAST CHURCH STREET.
May 30, 12:08 AM EDT	HAIL 0.75	Canton, GA	EMERGENCY MANAGER REPORTED DIME SIZED HAIL IN THE EAST CANTON AEA.

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 00:00Z, 3.5 hours before the alert went out and 93 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: 341 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 1320 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: -15 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.

705 
WUUS52 KFFC 300329
SVRFFC
GAC015-057-067-223-300415-
/O.NEW.KFFC.SV.W.0137.120530T0329Z-120530T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1129 PM EDT TUE MAY 29 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHEROKEE COUNTY IN NORTH CENTRAL GEORGIA
  NORTHERN COBB COUNTY IN NORTH CENTRAL GEORGIA
  BARTOW COUNTY IN NORTHWEST GEORGIA
  NORTHEASTERN PAULDING COUNTY IN NORTHWEST GEORGIA

* UNTIL 1215 AM EDT

* AT 1123 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED A 
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS UP
  TO 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
  WHITE TO CASSVILLE TO EUHARLEE...MOVING EAST AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  EMERSON...WALESKA...ACWORTH...KENNESAW...CANTON...HOLLY SPRINGS...
  WOODSTOCK...MARIETTA...BUFFINGTON...BALL GROUND AND FREE HOME.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO DAMAGING WINDS...FREQUENT CLOUD TO GROUND LIGHTNING IS 
OCCURRING WITH THESE STORMS. MOVE INDOORS IMMEDIATELY! REMEMBER...IF 
YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

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 3440 8481 3441 8459 3438 8458 3439 8442
      3437 8440 3437 8426 3419 8426 3419 8433
      3417 8436 3413 8436 3410 8442 3406 8442
      3398 8437 3392 8443 3401 8495 3408 8493
      3410 8497
TIME...MOT...LOC 0329Z 281DEG 31KT 3435 8470 3424 8475
          3408 8483

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 9:03 PM EDT	Special Weather Statement	FFC	Catoosa, Dade	42 min
May 29, 9:23 PM EDT	Severe Thunderstorm Warning	FFC	Catoosa, Walker	37 min
May 29, 9:58 PM EDT	Special Weather Statement	FFC	Catoosa, Chattooga, Gordon, Murray, Walker, Whitfield	62 min
May 29, 10:06 PM EDT	Severe Thunderstorm Warning	FFC	Chattooga	24 min
May 29, 10:22 PM EDT	Severe Thunderstorm Warning	FFC	Floyd	23 min
May 29, 10:43 PM EDT	Special Weather Statement	FFC	Chattooga, Fannin, Floyd, Gilmer, Gordon, Murray and 3 more	47 min
May 29, 10:59 PM EDT	Severe Thunderstorm Warning	FFC	Bartow, Floyd	31 min
May 29, 11:19 PM EDT	Special Weather Statement	FFC	Cherokee, Fannin, Gilmer, Pickens, Union	41 min
May 29, 11:50 PM EDT	Special Weather Statement	FFC	Carroll, Cobb, Douglas, Haralson, Paulding	40 min
May 30, 12:02 AM EDT	Special Weather Statement	FFC	Cherokee, Cobb, Dawson, Forsyth, Lumpkin, Towns and 2 more	28 min
May 30, 12:20 AM EDT	Special Weather Statement	FFC	Clayton, Coweta, DeKalb, Fayette, Forsyth, Fulton and 3 more	40 min
May 30, 12:58 AM EDT	Special Weather Statement	FFC	Clayton, Coweta, Fayette, Heard, Meriwether, Pike and 2 more	62 min
May 30, 1:47 AM EDT	Special Weather Statement	FFC	Harris, Lamar, Monroe, Muscogee, Talbot, Upson	58 min
May 30, 2:17 AM EDT	Special Weather Statement	FFC	Chattahoochee, Crawford, Macon, Marion, Muscogee, Peach and 5 more	43 min
May 30, 6:42 PM EDT	Special Weather Statement	FFC	Twiggs	33 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.