Alert archive / Georgia / Special Weather Statements in 2012

Special Weather Statement, NWS Atlanta, GA

August 7, 2012Johnson County, Georgia

NWS Atlanta, GA issued this special weather statement at Aug 7, 2012, 5:59 PM EDT for Johnson County, Georgia. It was in force for 31 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, 5:59 PM EDT (21:59 UTC)
Expired: Aug 7, 2012, 6:30 PM EDT
In force: 31 min
Issued by: NWS Atlanta, GA

County Johnson County, GA

The radar

The Robins AFB radar (KJGX), 87 km from the middle of the area, began a volume at 22:01 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, 10.0 hours before the alert went out and 207 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: 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.

572 
WWUS82 KFFC 072159
SPSFFC

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

GAZ085-086-072230-
559 PM EDT TUE AUG 7 2012

...SIGNIFICANT WEATHER ADVISORY FOR PEA SIZED HAIL AND 45 MPH WINDS
IN JOHNSON AND EMANUEL COUNTIES UNTIL 630 PM EDT...

AT 556 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR KITE...MOVING NORTHEAST AT 10 MPH.

THIS STORM HAS THE POTENTIAL TO PRODUCE PEA SIZED HAIL...FREQUENT
CLOUD TO GROUND LIGHTNING AND WIND GUSTS TO 45 MPH AS IT MOVES ACROSS
JOHNSON AND EMANUEL COUNTIES THROUGH 630 PM EDT. SOME LOCATIONS IN
THE PATH OF THIS STORM INCLUDE NORRISTOWN JUNCTION...SCOTT...MEEKS...
ADRIAN...KITE...THREE POINTS...MODOC...DELLWOOD...COLEMANS LAKE...
BLUNDALE AND SUMMERTOWN. HEAVY DOWNPOURS WILL CAUSE PONDING OF WATER
ON ROADWAYS.

THESE WIND GUSTS MAY PRODUCE MINOR DAMAGE TO TREE LIMBS AND BLOW
LIGHT...UNSECURED OBJECTS AROUND.

&&

LAT...LON 3250 8257 3252 8268 3261 8267 3264 8274
      3282 8252 3276 8245 3278 8240 3281 8241
      3281 8237 3284 8232 3281 8222 3282 8215
      3281 8213 3273 8210
TIME...MOT...LOC 2200Z 217DEG 7KT 3265 8249

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 2:11 AM EDT	Special Weather Statement	FFC	Union	34 min
Aug 7, 2:21 PM EDT	Special Weather Statement	FFC	Cherokee	24 min
Aug 7, 3:36 PM EDT	Special Weather Statement	FFC	Cobb	39 min
Aug 7, 4:15 PM EDT	Special Weather Statement	FFC	Toombs	30 min
Aug 7, 4:32 PM EDT	Special Weather Statement	FFC	Montgomery, Telfair, Wheeler	28 min
Aug 7, 4:40 PM EDT	Special Weather Statement	FFC	Wilkes	35 min
Aug 7, 4:44 PM EDT	Special Weather Statement	FFC	Toombs	16 min
Aug 7, 4:52 PM EDT	Special Weather Statement	FFC	Union	38 min
Aug 7, 4:58 PM EDT	Special Weather Statement	FFC	Montgomery, Telfair, Toombs, Wheeler	32 min
Aug 7, 5:02 PM EDT	Severe Thunderstorm Warning	FFC	Montgomery, Wheeler	43 min
Aug 7, 5:09 PM EDT	Special Weather Statement	FFC	Wilkes	36 min
Aug 7, 5:20 PM EDT	Special Weather Statement	FFC	Emanuel	25 min
Aug 7, 5:49 PM EDT	Special Weather Statement	FFC	Laurens	26 min
Aug 7, 6:22 PM EDT	Special Weather Statement	FFC	Johnson	23 min
Aug 7, 6:57 PM EDT	Special Weather Statement	FFC	Glascock	33 min
Aug 7, 7:05 PM EDT	Special Weather Statement	FFC	Washington	25 min
Aug 7, 7:17 PM EDT	Special Weather Statement	FFC	Hall	28 min
Aug 7, 7:34 PM EDT	Special Weather Statement	FFC	Glascock, Washington	86 min
Aug 7, 7:56 PM EDT	Special Weather Statement	FFC	Banks, Madison	49 min

Nearby

Special Weather Statements in Georgia, 2012 Every 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.