Alert archive / Georgia / Special Weather Statements in 2012

Special Weather Statement, NWS Atlanta, GA

August 7, 2012Cobb County, Georgia

NWS Atlanta, GA issued this special weather statement at Aug 7, 2012, 3:36 PM EDT for Cobb County, Georgia. It was in force for 39 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 7, 2012, 3:36 PM EDT (19:36 UTC)
Expired
Aug 7, 2012, 4:15 PM EDT
In force
39 min
Issued by
NWS Atlanta, GA

County Cobb County, GA

The radar

The Atlanta radar (KFFC), 77 km from the middle of the area, began a volume at 19:35 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, 7.6 hours before the alert went out and 75 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 2012-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 717 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 2012-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 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
717 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
568 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
-24 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.

666 
WWUS82 KFFC 071936
SPSFFC

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
336 PM EDT TUE AUG 7 2012

GAZ032-033-072015-
336 PM EDT TUE AUG 7 2012

...SIGNIFICANT WEATHER ADVISORY FOR HEAVY RAIN IN COBB AND NORTH 
FULTON COUNTIES UNTIL 415 PM EDT...

AT 331 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
NEARLY STATIONARY THUNDERSTORMS FROM ALPHARETTA TO MARIETTA.

RAINFALL AMOUNTS ESTIMATED BETWEEN ONE TO ONE AND A HALF INCHES HAVE 
FALLEN ACROSS COBB AND NORTHERN FULTON COUNTIES THIS 
AFTERNOON...INCLUDING AREAS AROUND SANDY SPRINGS...ROSWELL... 
ALPHARETTA...JIM R MILLER PARK...MOUNT BETHEL...SANDY PLAINS...
WHITE WATER PARK...DOBBINS AIR RESERVE BASE...VININGS...SMYRNA... 
MARIETTA...MOUNTAIN PARK...BIRMINGHAM...AND MILTON. DRIVERS SHOULD 
USE CAUTION AS INTENSE RAINFALL WILL REDUCE VISIBILITIES. PONDING OF 
WATER ON ROADWAYS IS ALSO LIKELY.

&&

LAT...LON 3404 8474 3408 8462 3407 8442 3410 8442
      3413 8436 3417 8435 3419 8426 3411 8426
      3406 8417 3396 8432 3397 8434 3394 8434
      3381 8454 3403 8474
TIME...MOT...LOC 1933Z 135DEG 0KT 3410 8431 3399 8454

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 2:11 AM EDTSpecial Weather StatementFFCUnion34 min
Aug 7, 2:21 PM EDTSpecial Weather StatementFFCCherokee24 min
Aug 7, 4:15 PM EDTSpecial Weather StatementFFCToombs30 min
Aug 7, 4:32 PM EDTSpecial Weather StatementFFCMontgomery, Telfair, Wheeler28 min
Aug 7, 4:40 PM EDTSpecial Weather StatementFFCWilkes35 min
Aug 7, 4:44 PM EDTSpecial Weather StatementFFCToombs16 min
Aug 7, 4:52 PM EDTSpecial Weather StatementFFCUnion38 min
Aug 7, 4:58 PM EDTSpecial Weather StatementFFCMontgomery, Telfair, Toombs, Wheeler32 min
Aug 7, 5:02 PM EDTSevere Thunderstorm WarningFFCMontgomery, Wheeler43 min
Aug 7, 5:09 PM EDTSpecial Weather StatementFFCWilkes36 min
Aug 7, 5:20 PM EDTSpecial Weather StatementFFCEmanuel25 min
Aug 7, 5:49 PM EDTSpecial Weather StatementFFCLaurens26 min
Aug 7, 5:59 PM EDTSpecial Weather StatementFFCJohnson31 min
Aug 7, 6:22 PM EDTSpecial Weather StatementFFCJohnson23 min
Aug 7, 6:57 PM EDTSpecial Weather StatementFFCGlascock33 min
Aug 7, 7:05 PM EDTSpecial Weather StatementFFCWashington25 min
Aug 7, 7:17 PM EDTSpecial Weather StatementFFCHall28 min
Aug 7, 7:34 PM EDTSpecial Weather StatementFFCGlascock, Washington86 min
Aug 7, 7:56 PM EDTSpecial Weather StatementFFCBanks, Madison49 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.