Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 114, NWS Atlanta, GA

May 17, 2012Cobb County, Douglas County, Fulton County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at May 17, 2012, 8:19 PM EDT for Cobb County, Douglas County, Fulton County, Georgia. It was in force for 41 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: May 17, 2012, 8:19 PM EDT (00:19 UTC)
Expired: May 17, 2012, 9:00 PM EDT
In force: 41 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Cobb County, GA, Douglas County, GA, Fulton County, GA

The radar

The Atlanta radar (KFFC), 41 km from the middle of the area, began a volume at 00:18 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 17, 8:25 PM EDT	HAIL 1	3 Se Mableton, GA	QUARTER SIZED HAIL REPORTED NEAR MABLETON.

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, 0.3 hours before the alert went out and 40 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: -36 J/kg
Mixed-layer LCL: 2205 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 103 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.

255 
WUUS52 KFFC 180019
SVRFFC
GAC067-097-121-180100-
/O.NEW.KFFC.SV.W.0114.120518T0019Z-120518T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
819 PM EDT THU MAY 17 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL COBB COUNTY IN NORTH CENTRAL GEORGIA
  EASTERN DOUGLAS COUNTY IN NORTH CENTRAL GEORGIA
  CENTRAL FULTON COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 900 PM EDT

* AT 814 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 SMYRNA...
  MOVING SOUTHWEST AT 20 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO   
AUSTELL.

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.

THERE HAVE BEEN NUMEROUS REPORTS OF QUARTER TO HALF DOLLAR SIZED 
HAIL COVERING THE GROUND AS THIS STORM MOVED THROUGH SMYRNA AND 
MARIETTA. IF YOU ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE 
ACTION TO PROTECT LIFE AND PROPERTY.

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 3362 8448 3366 8479 3389 8456 3387 8437
TIME...MOT...LOC 0017Z 032DEG 17KT 3383 8449

$$

1 follow-up statement

094 
WWUS52 KFFC 180042
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
842 PM EDT THU MAY 17 2012

GAC067-121-180052-
/O.CAN.KFFC.SV.W.0114.000000T0000Z-120518T0100Z/
COBB GA-FULTON GA-
842 PM EDT THU MAY 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FULTON AND SOUTH
CENTRAL COBB COUNTIES IS CANCELLED...

THE STORM THAT PRODUCED THE LARGE HAIL OVER COBB COUNTY HAS MOVED 
INTO DOUGLASS COUNTY AND NO LONGER THREATENS COBB AND FULTON 
COUNTIES.

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 3381 8464 3380 8463 3379 8461 3375 8458
      3368 8466 3367 8465 3366 8466 3365 8470
      3366 8479
TIME...MOT...LOC 0042Z 032DEG 17KT 3376 8462

$$

GAC097-180100-
/O.CON.KFFC.SV.W.0114.000000T0000Z-120518T0100Z/
DOUGLAS GA-
842 PM EDT THU MAY 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR NORTHEASTERN DOUGLAS COUNTY...

AT 840 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
SWEETWATER CREEK STATE PARK...MOVING SOUTHWEST AT 20 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CHAPEL
HILL.

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 3381 8464 3380 8463 3379 8461 3375 8458
      3368 8466 3367 8465 3366 8466 3365 8470
      3366 8479
TIME...MOT...LOC 0042Z 032DEG 17KT 3376 8462

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 8:20 PM EDT	Special Weather Statement	FFC	Fayette	25 min
May 17, 8:56 PM EDT	Special Weather Statement	FFC	Forsyth	49 min
May 17, 8:59 PM EDT	Special Weather Statement	FFC	Douglas	46 min
May 17, 9:01 PM EDT	Severe Thunderstorm Warning	FFC	Carroll, Douglas, Fulton	44 min
May 17, 9:06 PM EDT	Severe Thunderstorm Warning	FFC	Dawson, Forsyth	39 min
May 17, 10:00 PM EDT	Special Weather Statement	FFC	Heard	30 min
May 18, 1:44 PM EDT	Special Weather Statement	FFC	Murray	31 min
May 18, 1:54 PM EDT	Special Weather Statement	FFC	Gilmer, Murray	51 min
May 18, 2:46 PM EDT	Special Weather Statement	FFC	Gordon	44 min
May 18, 3:00 PM EDT	Special Weather Statement	FFC	Gilmer	45 min
May 18, 3:19 PM EDT	Special Weather Statement	FFC	Fannin, Gilmer, Towns, Union	26 min
May 18, 3:49 PM EDT	Special Weather Statement	FFC	Fannin, Union	26 min
May 18, 3:52 PM EDT	Special Weather Statement	FFC	Gordon	38 min
May 18, 5:30 PM EDT	Special Weather Statement	FFC	Bartow, Floyd	45 min
May 18, 6:29 PM EDT	Special Weather Statement	FFC	Dade, Walker	46 min
May 18, 7:07 PM EDT	Severe Thunderstorm Warning	FFC	Dade	23 min
May 18, 7:27 PM EDT	Severe Thunderstorm Warning	FFC	Dade	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.