Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 359, NWS Atlanta, GA

June 21, 2011Twiggs County, Wilkinson County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jun 21, 2011, 6:37 PM EDT for Twiggs County, Wilkinson County, Georgia. It was in force for 38 min. 1 report 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: Jun 21, 2011, 6:37 PM EDT (22:37 UTC)
Expired: Jun 21, 2011, 7:15 PM EDT
In force: 38 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Twiggs County, GA, Wilkinson County, GA

The radar

The Robins AFB radar (KJGX), 18 km from the middle of the area, began a volume at 22:41 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
Jun 21, 7:05 PM EDT	TSTM WND DMG	Irwinton, GA	WILKINSON EMA RELAYED A REPORT OF TEN TREES DOWN IN THE IRWINTON AREA.

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, 10.6 hours before the alert went out and 128 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: 1450 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 1187 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -43 m²/s²
0-3 km storm-relative helicity: -64 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.

216 
WUUS52 KFFC 212237
SVRFFC
GAC289-319-212315-
/O.NEW.KFFC.SV.W.0359.110621T2237Z-110621T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
637 PM EDT TUE JUN 21 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN TWIGGS COUNTY IN CENTRAL GEORGIA
  WILKINSON COUNTY IN CENTRAL GEORGIA

* UNTIL 715 PM EDT

* AT 634 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZED HAIL...AND
  DAMAGING WINDS UP TO 60 MPH.  THIS STORM WAS LOCATED NEAR
  JEFFERSONVILLE...MOVING NORTHEAST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MCINTYRE...IVEY...GORDON AND IRWINTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

IF YOU SEE WIND DAMAGE...LARGE HAIL OR SIGNIFICANT 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.

&&

LAT...LON 3258 8329 3269 8349 3293 8334 3295 8330
      3294 8328 3296 8326 3297 8325 3287 8305
TIME...MOT...LOC 2237Z 211DEG 12KT 3270 8335

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 5:50 PM EDT	Special Weather Statement	FFC	Chattooga, Dade, Floyd, Walker	55 min
Jun 21, 6:02 PM EDT	Severe Thunderstorm Warning	FFC	Catoosa, Chattooga, Dade, Walker	43 min
Jun 21, 6:04 PM EDT	Severe Thunderstorm Warning	FFC	Oglethorpe, Wilkes	41 min
Jun 21, 6:28 PM EDT	Special Weather Statement	FFC	Twiggs, Wilkinson	47 min
Jun 21, 6:45 PM EDT	Special Weather Statement	FFC	Catoosa	30 min
Jun 21, 6:46 PM EDT	Special Weather Statement	FFC	Bleckley	29 min
Jun 21, 6:49 PM EDT	Special Weather Statement	FFC	Oglethorpe, Wilkes	41 min
Jun 21, 6:59 PM EDT	Special Weather Statement	FFC	Hancock	46 min
Jun 21, 7:07 PM EDT	Severe Thunderstorm Warning	FFC	Hancock, Washington	38 min
Jun 21, 7:12 PM EDT	Severe Thunderstorm Warning	FFC	Bleckley, Twiggs, Wilkinson	32 min
Jun 21, 7:25 PM EDT	Special Weather Statement	FFC	Murray	50 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2011 Every severe thunderstorm warning in 2011

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.