Alert archive / Georgia / Special Weather Statements in 2012

Special Weather Statement, NWS Atlanta, GA

August 4, 2012Barrow County, Jackson County, Georgia

NWS Atlanta, GA issued this special weather statement at Aug 4, 2012, 7:18 PM EDT for Barrow County, Jackson County, Georgia. It was in force for 27 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
Aug 4, 2012, 7:18 PM EDT (23:18 UTC)
Expired
Aug 4, 2012, 7:45 PM EDT
In force
27 min
Issued by
NWS Atlanta, GA

Counties Barrow County, GA, Jackson County, GA

The radar

The Atlanta radar (KFFC), 114 km from the middle of the area, began a volume at 23:21 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, 11.3 hours before the alert went out and 109 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 2012-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 975 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 2012-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -27 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
975 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
720 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-27 m²/s²
0-3 km storm-relative helicity
-29 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.

526 
WWUS82 KFFC 042318
SPSFFC

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
718 PM EDT SAT AUG 4 2012

GAZ023-025-035-042345-
718 PM EDT SAT AUG 4 2012

...SIGNIFICANT WEATHER ADVISORY FOR 40 MPH WINDS IN BARROW...HALL AND
JACKSON COUNTIES UNTIL 745 PM EDT...

AT 716 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER PENDERGRASS...MOVING NORTHWEST AT 20 MPH.

THIS STORM HAS THE POTENTIAL TO PRODUCE FREQUENT CLOUD TO GROUND 
LIGHTNING AND WIND GUSTS TO 40 MPH AS IT MOVES ACROSS BARROW...HALL 
AND JACKSON COUNTIES THROUGH 745 PM EDT. SOME LOCATIONS IN THE PATH 
OF THIS STORM INCLUDE COUNTY LINE...WINDER...STATHAM...RUSSELL... 
ARCADE...JEFFERSON...HOSCHTON...BRASELTON...PENDERGRASS...CHATEAU 
ELAN...THOMPSONS MILL...TALMO...ROAD ATLANTA-LANIER 
SPEEDWAY...CANDLER AND CHESTNUT MOUNTAIN. HEAVY DOWNPOURS WILL CAUSE 
PONDING OF WATER ON ROADWAYS.

&&

LAT...LON 3403 8346 3393 8366 3409 8384 3412 8382
      3411 8386 3420 8396 3437 8375
TIME...MOT...LOC 2318Z 140DEG 18KT 3410 8367

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 8:17 PM EDTSpecial Weather StatementFFCGreene43 min
Aug 3, 8:32 PM EDTSpecial Weather StatementFFCHenry28 min
Aug 3, 8:46 PM EDTSpecial Weather StatementFFCHall44 min
Aug 3, 8:55 PM EDTSpecial Weather StatementFFCPike50 min
Aug 3, 9:10 PM EDTSpecial Weather StatementFFCJohnson50 min
Aug 3, 9:31 PM EDTSpecial Weather StatementFFCSpalding44 min
Aug 3, 9:49 PM EDTSpecial Weather StatementFFCHall41 min
Aug 3, 10:05 PM EDTSpecial Weather StatementFFCJefferson40 min
Aug 4, 12:34 AM EDTSpecial Weather StatementFFCPutnam26 min
Aug 4, 1:00 AM EDTSpecial Weather StatementFFCHancock, Putnam30 min
Aug 4, 2:43 PM EDTSpecial Weather StatementFFCFloyd62 min
Aug 4, 3:11 PM EDTSpecial Weather StatementFFCPolk49 min
Aug 4, 3:57 PM EDTSpecial Weather StatementFFCPolk33 min
Aug 4, 5:02 PM EDTSpecial Weather StatementFFCHaralson, Polk43 min
Aug 4, 7:27 PM EDTSpecial Weather StatementFFCDouglas33 min

Nearby

Special Weather Statements in Georgia, 2012Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.