Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 489, NWS Atlanta, GA

September 27, 2011Twiggs County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Sep 27, 2011, 3:56 PM EDT for Twiggs County, Georgia. It was in force for 34 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: Sep 27, 2011, 3:56 PM EDT (19:56 UTC)
Expired: Sep 27, 2011, 4:30 PM EDT
In force: 34 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

County Twiggs County, GA

The radar

The Robins AFB radar (KJGX), 9 km from the middle of the area, began a volume at 19:57 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
Sep 27, 3:59 PM EDT	TSTM WND DMG	1 S Bullard, GA	TWIGGS COUNTY 911 RELAYED A REPORT OF THREE TREES DOWN SOUTH OF BULLARD.

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, 7.9 hours before the alert went out and 130 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: 1343 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 839 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

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

920 
WUUS52 KFFC 271956
SVRFFC
GAC289-272030-
/O.NEW.KFFC.SV.W.0489.110927T1956Z-110927T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
356 PM EDT TUE SEP 27 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

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

* UNTIL 430 PM EDT

* AT 352 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 7 MILES
  SOUTHWEST OF JEFFERSONVILLE...MOVING EAST AT 25 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  DANVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3252 8350 3269 8356 3277 8333 3260 8323
TIME...MOT...LOC 1956Z 255DEG 20KT 3263 8342

$$

26/16

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 26, 8:18 PM EDT	Special Weather Statement	FFC	White	27 min
Sep 27, 2:35 PM EDT	Special Weather Statement	FFC	Macon, Schley	25 min
Sep 27, 2:39 PM EDT	Special Weather Statement	FFC	Crawford	36 min
Sep 27, 3:05 PM EDT	Special Weather Statement	FFC	Wilkinson	25 min
Sep 27, 3:34 PM EDT	Special Weather Statement	FFC	Washington	26 min
Sep 27, 3:42 PM EDT	Severe Thunderstorm Warning	FFC	Bibb, Jones, Twiggs	48 min
Sep 27, 4:14 PM EDT	Special Weather Statement	FFC	Wilkinson	31 min
Sep 27, 4:27 PM EDT	Severe Thunderstorm Warning	FFC	Hancock, Washington	33 min
Sep 27, 4:37 PM EDT	Severe Thunderstorm Warning	FFC	Butts, Jasper, Newton	23 min
Sep 27, 4:42 PM EDT	Severe Thunderstorm Warning	FFC	Emanuel, Jefferson	48 min
Sep 27, 4:50 PM EDT	Special Weather Statement	FFC	Johnson	25 min
Sep 27, 4:53 PM EDT	Special Weather Statement	FFC	Glascock	22 min
Sep 27, 4:59 PM EDT	Special Weather Statement	FFC	Butts, Jasper	31 min
Sep 27, 5:09 PM EDT	Severe Thunderstorm Warning	FFC	Emanuel	36 min
Sep 27, 5:34 PM EDT	Special Weather Statement	FFC	Morgan, Oconee	26 min
Sep 27, 5:37 PM EDT	Special Weather Statement	FFC	Butts	23 min
Sep 27, 6:29 PM EDT	Special Weather Statement	FFC	Oglethorpe	31 min
Sep 27, 7:24 PM EDT	Special Weather Statement	FFC	Wilkes	36 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.