Alert archive / Georgia / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 256, NWS Atlanta, GA

September 12, 2014Walton County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Sep 12, 2014, 6:07 PM EDT for Walton County, Georgia. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 12, 2014, 6:07 PM EDT (22:07 UTC)
Expired
Sep 12, 2014, 6:45 PM EDT
In force
38 min
Issued by
NWS Atlanta, GA
Area
Storm-based polygon

County Walton County, GA

The radar

The Atlanta radar (KFFC), 101 km from the middle of the area, began a volume at 22:07 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.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.1 hours before the alert went out and 95 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-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 12:00Z on 2014-09-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 603 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 12:00Z on 2014-09-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
603 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
870 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
0 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.

553 
WUUS52 KFFC 122207
SVRFFC
GAC297-122245-
/O.NEW.KFFC.SV.W.0256.140912T2207Z-140912T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
607 PM EDT FRI SEP 12 2014

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN WALTON COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 645 PM EDT

* AT 605 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS UP TO 60
  MPH.  THIS STORM WAS LOCATED NEAR MONROE...MOVING SOUTHEAST AT 5   
  TO 10 MPH.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS AND DEADLY CLOUD TO GROUND LIGHTNING. 
PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG 
BUILDING AND AWAY FROM WINDOWS.

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 OR TWEET US YOUR REPORT AT NWSATLANTA.

&&

LAT...LON 3390 8365 3391 8364 3389 8362 3387 8358
      3385 8357 3382 8351 3367 8363 3380 8382
      3390 8376 3390 8373 3391 8368
TIME...MOT...LOC 2207Z 302DEG 4KT 3382 8371

$$
1 follow-up statement
670 
WWUS52 KFFC 122239
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
639 PM EDT FRI SEP 12 2014

GAC297-122245-
/O.CON.KFFC.SV.W.0256.000000T0000Z-140912T2245Z/
WALTON GA-
639 PM EDT FRI SEP 12 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR EASTERN WALTON COUNTY...

AT 638 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A STRONG THUNDERSTORM THAT STRETCHED FROM BETWEEN TO NEAR 
MONROE AND GOOD HOPE...AND MOVING EAST TO SOUTHEAST AT 5 MPH. THIS 
STORM IS WEAKENING AND THE WARNING IS EXPECTED TO BE ALLOWED TO 
EXPIRE AT 645 PM EDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ALTHOUGH THE WIND THREAT HAS GREATLY DIMINISHED... OCCASIONAL CLOUD 
TO GROUND LIGHTNING AND VERY HEAVY RAIN CAN STILL BE EXPECTED... 
POSSIBLY CAUSING SOME MINOR FLOODING. ALSO REMEMBER... LIGHTNING IS 
ONE OF NATURES NUMBER ONE KILLERS. 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 OR TWEET US YOUR REPORT AT NWSATLANTA.

&&

LAT...LON 3390 8365 3391 8364 3389 8362 3387 8358
      3385 8357 3382 8351 3367 8363 3380 8382
      3390 8376 3390 8373 3391 8368
TIME...MOT...LOC 2234Z 302DEG 4KT 3380 8368

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 11, 9:46 PM EDTSpecial Weather StatementFFCFloyd59 min
Sep 12, 8:09 AM EDTFlash Flood WarningFFCDeKalb, Fulton, Gwinnett6 hr
Sep 12, 2:47 PM EDTSpecial Weather StatementFFCWhite28 min
Sep 12, 2:56 PM EDTSpecial Weather StatementFFCHeard34 min
Sep 12, 3:25 PM EDTSpecial Weather StatementFFCLumpkin, White35 min
Sep 12, 4:11 PM EDTSpecial Weather StatementFFCFloyd34 min
Sep 12, 4:29 PM EDTSpecial Weather StatementFFCWhite31 min
Sep 12, 4:40 PM EDTSpecial Weather StatementFFCPaulding35 min
Sep 12, 4:55 PM EDTSpecial Weather StatementFFCDeKalb35 min
Sep 12, 4:58 PM EDTSpecial Weather StatementFFCClayton32 min
Sep 12, 5:28 PM EDTSpecial Weather StatementFFCGwinnett32 min
Sep 12, 5:36 PM EDTSpecial Weather StatementFFCRockdale24 min
Sep 12, 5:41 PM EDTSpecial Weather StatementFFCDeKalb, Fulton49 min
Sep 12, 5:50 PM EDTSpecial Weather StatementFFCPaulding, Polk40 min
Sep 12, 6:03 PM EDTSpecial Weather StatementFFCDouglas27 min
Sep 12, 6:22 PM EDTSpecial Weather StatementFFCFayette23 min
Sep 12, 6:41 PM EDTSpecial Weather StatementFFCOglethorpe34 min
Sep 12, 6:50 PM EDTSpecial Weather StatementFFCFulton25 min
Sep 12, 7:11 PM EDTSpecial Weather StatementFFCOconee34 min
Sep 12, 7:26 PM EDTSpecial Weather StatementFFCDeKalb, Fulton34 min
Sep 12, 7:59 PM EDTSpecial Weather StatementFFCHarris31 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2014Every severe thunderstorm warning in 2014

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.