Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 337, NWS Atlanta, GA

August 14, 20127 counties in Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Aug 14, 2012, 4:21 PM EDT for 7 counties in Georgia. It was in force for 39 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 14, 2012, 4:21 PM EDT (20:21 UTC)
Expired: Aug 14, 2012, 5:00 PM EDT
In force: 39 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Bibb County, GA, Crawford County, GA, Houston County, GA, Jones County, GA, Peach County, GA, Twiggs County, GA, Wilkinson County, GA

The radar

The Robins AFB radar (KJGX), 15 km from the middle of the area, began a volume at 20:23 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.

What was reported inside it

Time	Report	Where	Remark
Aug 14, 4:30 PM EDT	TSTM WND DMG	4 Ssw Macon, GA	AMATEUR RADIO OPERATOR RELAYED REPORTS OF SEVERAL TREES DOWN ACROSS MUCH OF BIBB COUNTY.
Aug 14, 4:50 PM EDT	TSTM WND DMG	1 Sw Griswoldville, GA	AMATEUR RADIO OPERATOR RELAYED A REPORT OF SEVERAL TREES DOWN OVER EXTREME SOUTHEAST JONES COUNTY.
Aug 14, 5:05 PM EDT	TSTM WND DMG	3 Se Jeffersonville, GA	LARGE TREE FELL ON A HOUSE ON CHARLIE FLOYD RD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.4 hours before the alert went out and 117 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: 546 J/kg
Mixed-layer CIN: -203 J/kg
Mixed-layer LCL: 1220 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

883 
WUUS52 KFFC 142021
SVRFFC
GAC021-079-153-169-225-289-319-142100-
/O.NEW.KFFC.SV.W.0337.120814T2021Z-120814T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
421 PM EDT TUE AUG 14 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BIBB COUNTY IN CENTRAL GEORGIA
  EXTREME EAST CENTRAL CRAWFORD COUNTY IN CENTRAL GEORGIA
  NORTHEASTERN HOUSTON COUNTY IN CENTRAL GEORGIA
  SOUTH CENTRAL JONES COUNTY IN CENTRAL GEORGIA
  NORTHEASTERN PEACH COUNTY IN CENTRAL GEORGIA
  TWIGGS COUNTY IN CENTRAL GEORGIA
  NORTHWESTERN WILKINSON COUNTY IN CENTRAL GEORGIA

* UNTIL 500 PM EDT

* AT 418 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 BYRON...MOVING EAST AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  CENTERVILLE...WARNER ROBINS...PAYNE CITY...MACON...GORDON AND
  JEFFERSONVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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. YOU CAN ALSO TWEET YOUR REPORT USING HASHTAG GAWX.

&&

LAT...LON 3291 8330 3258 8325 3253 8375 3284 8378
TIME...MOT...LOC 2021Z 251DEG 29KT 3268 8373

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 3:11 AM EDT	Special Weather Statement	FFC	Bartow, Carroll, Haralson, Heard, Paulding, Polk	79 min
Aug 14, 8:50 AM EDT	Special Weather Statement	FFC	Coweta, Fayette, Harris, Heard, Meriwether, Muscogee and 1 more	25 min
Aug 14, 9:12 AM EDT	Special Weather Statement	FFC	Clayton, Fayette	33 min
Aug 14, 9:14 AM EDT	Special Weather Statement	FFC	Talbot	31 min
Aug 14, 9:17 AM EDT	Special Weather Statement	FFC	Polk	28 min
Aug 14, 3:04 PM EDT	Special Weather Statement	FFC	Marion	41 min
Aug 14, 3:10 PM EDT	Severe Thunderstorm Warning	FFC	Macon, Marion, Schley, Taylor	50 min
Aug 14, 3:16 PM EDT	Special Weather Statement	FFC	Stewart	44 min
Aug 14, 3:42 PM EDT	Severe Thunderstorm Warning	FFC	Bibb, Crawford, Macon, Peach, Taylor	48 min
Aug 14, 4:34 PM EDT	Severe Thunderstorm Warning	FFC	Dooly, Houston, Pulaski	41 min
Aug 14, 5:01 PM EDT	Severe Thunderstorm Warning	FFC	Bleckley, Houston, Laurens, Twiggs, Wilkinson	29 min
Aug 14, 5:21 PM EDT	Severe Thunderstorm Warning	FFC	Bleckley, Johnson, Laurens, Twiggs, Washington, Wilkinson	39 min
Aug 14, 5:46 PM EDT	Severe Thunderstorm Warning	FFC	Emanuel, Glascock, Jefferson, Johnson, Laurens, Washington	59 min
Aug 14, 6:25 PM EDT	Severe Thunderstorm Warning	FFC	Glascock, Hancock, Jefferson, Warren, Washington	35 min
Aug 14, 6:49 PM EDT	Special Weather Statement	FFC	Jefferson	11 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2012 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.