Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 478, NWS Atlanta, GA

August 21, 2011Douglas County, Fulton County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Aug 21, 2011, 6:22 PM EDT for Douglas County, Fulton County, Georgia. It was in force for 38 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: Aug 21, 2011, 6:22 PM EDT (22:22 UTC)
Expired: Aug 21, 2011, 7:00 PM EDT
In force: 38 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Douglas County, GA, Fulton County, GA

The radar

The Atlanta radar (KFFC), 32 km from the middle of the area, began a volume at 22:25 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 21, 6:29 PM EDT	TSTM WND DMG	2 Ese Fairplay, GA	DOUGLAS COUNTY 911 RELAYED A REPORT OF A TREE DOWN IN ESE OF FAIRPLAY. OPERATOR ALSO RELAYED THAT THEY HAD REPORTS OF SMALL PENNY SIZED HAIL.

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, 10.4 hours before the alert went out and 35 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: 428 J/kg
Mixed-layer CIN: -118 J/kg
Mixed-layer LCL: 1235 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: -9 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.

574 
WUUS52 KFFC 212222
SVRFFC
GAC097-121-212300-
/O.NEW.KFFC.SV.W.0478.110821T2222Z-110821T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
622 PM EDT SUN AUG 21 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DOUGLAS COUNTY IN NORTH CENTRAL GEORGIA
  SOUTHWESTERN FULTON COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 700 PM EDT

* AT 621 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 6 MILES SOUTH
  OF DOUGLASVILLE...MOVING SOUTHEAST AT 20 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  CHATTAHOOCHEE HILL COUNTRY...PALMETTO...FAIRBURN AND UNION CITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3378 8481 3379 8474 3360 8446 3355 8446
      3352 8459 3350 8461 3351 8474 3356 8482
      3358 8482 3358 8484 3362 8490 3370 8490
TIME...MOT...LOC 2222Z 313DEG 16KT 3366 8474

$$

1 follow-up statement

512 
WWUS52 KFFC 212234
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
634 PM EDT SUN AUG 21 2011

GAC097-121-212300-
/O.CON.KFFC.SV.W.0478.000000T0000Z-110821T2300Z/
DOUGLAS GA-FULTON GA-
634 PM EDT SUN AUG 21 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR SOUTHWESTERN FULTON AND SOUTHERN DOUGLAS COUNTIES...

AT 629 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 
CHATTAHOOCHEE HILL COUNTRY...MOVING SOUTHEAST AT 20 MPH. REPORTS OF 
NICKEL SIZED HAIL HAVE ALREADY BEEN RECEIVED WITH THIS STORM. 

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
PALMETTO...FAIRBURN AND UNION CITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3368 8490 3374 8467 3360 8446 3355 8446
      3352 8459 3350 8461 3351 8474 3356 8482
      3358 8482 3358 8484 3362 8490
TIME...MOT...LOC 2232Z 317DEG 19KT 3360 8472

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 5:41 PM EDT	Special Weather Statement	FFC	Gordon, Murray, Pickens, Whitfield	49 min
Aug 21, 6:10 PM EDT	Special Weather Statement	FFC	Douglas	35 min
Aug 21, 6:40 PM EDT	Special Weather Statement	FFC	Cherokee, Pickens	50 min
Aug 21, 6:52 PM EDT	Special Weather Statement	FFC	Coweta	23 min
Aug 21, 7:05 PM EDT	Special Weather Statement	FFC	Douglas	25 min
Aug 21, 7:22 PM EDT	Special Weather Statement	FFC	DeKalb, Fulton	38 min
Aug 21, 7:30 PM EDT	Special Weather Statement	FFC	Cherokee	30 min
Aug 21, 7:36 PM EDT	Special Weather Statement	FFC	Douglas	39 min
Aug 21, 7:43 PM EDT	Severe Thunderstorm Warning	FFC	Forsyth, Fulton, Gwinnett	33 min
Aug 21, 7:47 PM EDT	Severe Thunderstorm Warning	FFC	DeKalb, Fulton	26 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.