Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 488, NWS Atlanta, GA

September 27, 2011Bibb County, Jones County, Twiggs County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Sep 27, 2011, 3:42 PM EDT for Bibb County, Jones County, Twiggs County, Georgia. It was in force for 48 min. 4 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: Sep 27, 2011, 3:42 PM EDT (19:42 UTC)
Expired: Sep 27, 2011, 4:30 PM EDT
In force: 48 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Bibb County, GA, Jones County, GA, Twiggs County, GA

The radar

The Robins AFB radar (KJGX), 26 km from the middle of the area, began a volume at 19:42 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, 3:42 PM EDT	TSTM WND DMG	1 Sse Macon, GA	AMATUER RADIO OPERATOR RELAYED A REPORT OF STRAIGHT LINE WIND DAMAGE JUST SOUTH OF DOWNTOWN MACON. 12-14 TREES WERE REPORTED DOWN ALONG WITH DAMAGE TO 2-3 STRUCTURES IN THE AREA AS WELL.
Sep 27, 3:42 PM EDT	HAIL 0.88	Macon, GA
Sep 27, 3:50 PM EDT	HAIL 1	1 Ese Macon, GA
Sep 27, 4:00 PM EDT	HAIL 1	Dry Branch, GA

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, 7.7 hours before the alert went out and 109 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.

129 
WUUS52 KFFC 271942
SVRFFC
GAC021-169-289-272030-
/O.NEW.KFFC.SV.W.0488.110927T1942Z-110927T2030Z/

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

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN BIBB COUNTY IN CENTRAL GEORGIA
  SOUTHEASTERN JONES COUNTY IN CENTRAL GEORGIA
  NORTHERN TWIGGS COUNTY IN CENTRAL GEORGIA

* UNTIL 430 PM EDT

* AT 342 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 MACON...
  MOVING EAST AT 20 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  FRANKLINTON...DRY BRANCH...POSTELL...GRISWOLDVILLE...FITZPATRICK...
  MOUNTAIN SPRINGS...GREENBERRY CROSSROADS AND MYRICKS MILL.

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 3289 8372 3298 8337 3294 8336 3293 8336
      3290 8341 3276 8333 3271 8367
TIME...MOT...LOC 1942Z 257DEG 17KT 3282 8358

$$
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, 3:56 PM EDT	Severe Thunderstorm Warning	FFC	Twiggs	34 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.