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, 6:22 PM EDT for Johnson County, Georgia. It was in force for 23 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, 6:22 PM EDT (22:22 UTC)
Expired: Aug 7, 2012, 6:45 PM EDT
In force: 23 min
Issued by: NWS Atlanta, GA

County Johnson County, GA

The radar

The Robins AFB radar (KJGX), 89 km from the middle of the area, began a volume at 22:23 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, 10.4 hours before the alert went out and 206 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.

382 
WWUS82 KFFC 072222
SPSFFC

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

GAZ074-076-084>086-097-072245-
622 PM EDT TUE AUG 7 2012

...SIGNIFICANT WEATHER ADVISORY FOR PEA SIZED HAIL AND 40 MPH WINDS
IN WASHINGTON...LAURENS...JOHNSON...WILKINSON...EMANUEL AND JEFFERSON
COUNTIES UNTIL 645 PM EDT...

AT 618 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
STRONG THUNDERSTORMS FROM SUMMERTOWN TO DUBLIN...MOVING NORTH AT 5 
MPH.

THESE STORMS HAVE THE POTENTIAL TO PRODUCE PEA SIZED HAIL...FREQUENT
CLOUD TO GROUND LIGHTNING AND WIND GUSTS TO 40 MPH AS THEY MOVE
ACROSS WASHINGTON...LAURENS...JOHNSON...WILKINSON...EMANUEL AND
JEFFERSON COUNTIES THROUGH 645 PM EDT. SOME LOCATIONS IN THE PATH OF
THESE STORMS INCLUDE LOVETT...BREWTON...EAST DUBLIN...DUDLEY...
MODOC...DELLWOOD...CANOOCHEE...SPANN...MEEKS...KITE...SUMMERTOWN...
BLUNDALE...TUCKERS CROSSROAD...CHAPPELLS MILL AND THREE POINTS. 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 3265 8215 3262 8259 3249 8309 3281 8317
      3308 8228 3293 8227 3284 8231 3281 8222
      3282 8215 3281 8213
TIME...MOT...LOC 2222Z 181DEG 6KT 3273 8225 3271 8259
          3262 8293

$$

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, 5:59 PM EDT	Special Weather Statement	FFC	Johnson	31 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.