Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 165, NWS Atlanta, GA

June 11, 2012Jefferson County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jun 11, 2012, 2:47 PM EDT for Jefferson County, Georgia. It was in force for 28 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: Jun 11, 2012, 2:47 PM EDT (18:47 UTC)
Expired: Jun 11, 2012, 3:15 PM EDT
In force: 28 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

County Jefferson County, GA

The radar

The Robins AFB radar (KJGX), 102 km from the middle of the area, began a volume at 18:48 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, 6.8 hours before the alert went out and 204 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: 107 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 473 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

234 
WUUS52 KFFC 111847
SVRFFC
GAC163-111915-
/O.NEW.KFFC.SV.W.0165.120611T1847Z-120611T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
247 PM EDT MON JUN 11 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL JEFFERSON COUNTY IN EAST CENTRAL GEORGIA

* UNTIL 315 PM EDT

* AT 243 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS UP
  TO 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 
  WEST THROUGH EAST OF LOUISVILLE...MOVING NORTHEAST AT 50 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  STELLAVILLE AND MATTHEWS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS. SEEK SHELTER NOW 
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

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 3308 8228 3296 8227 3295 8226 3288 8229
      3288 8230 3295 8254 3298 8254 3314 8248
      3322 8232 3322 8223
TIME...MOT...LOC 1847Z 245DEG 43KT 3298 8249 3302 8231
          3303 8218

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 8:17 PM EDT	Special Weather Statement	FFC	Emanuel	43 min
Jun 10, 8:52 PM EDT	Special Weather Statement	FFC	Emanuel	38 min
Jun 11, 12:19 PM EDT	Special Weather Statement	FFC	Houston, Macon, Marion, Schley, Sumter, Webster	41 min
Jun 11, 12:56 PM EDT	Special Weather Statement	FFC	Dooly, Houston, Pulaski	49 min
Jun 11, 1:00 PM EDT	Special Weather Statement	FFC	Bleckley, Dodge, Laurens	45 min
Jun 11, 1:27 PM EDT	Severe Thunderstorm Warning	FFC	Johnson, Laurens, Treutlen	33 min
Jun 11, 1:32 PM EDT	Special Weather Statement	FFC	Bleckley, Pulaski, Twiggs	43 min
Jun 11, 1:36 PM EDT	Special Weather Statement	FFC	Crisp, Wilcox	39 min
Jun 11, 1:47 PM EDT	Severe Thunderstorm Warning	FFC	Emanuel, Jefferson, Johnson, Montgomery, Treutlen, Washington	58 min
Jun 11, 2:05 PM EDT	Special Weather Statement	FFC	Bleckley, Crisp, Dodge, Laurens, Telfair, Wheeler and 1 more	40 min
Jun 11, 2:43 PM EDT	Special Weather Statement	FFC	Emanuel, Montgomery, Telfair, Toombs, Treutlen, Wheeler	62 min
Jun 11, 3:42 PM EDT	Special Weather Statement	FFC	Toombs	18 min
Jun 11, 3:47 PM EDT	Flood Watch	FFC	Baldwin, Bibb, Bleckley, Chattahoochee, Crawford, Crisp and 30 more	13 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.