Alert archive / Georgia / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 430, NWS Atlanta, GA

September 9, 2009Towns County, White County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Sep 9, 2009, 5:08 PM EDT for Towns County, White County, Georgia. It was in force for 23 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: Sep 9, 2009, 5:08 PM EDT (21:08 UTC)
Expired: Sep 9, 2009, 5:31 PM EDT
In force: 23 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Towns County, GA, White County, GA

The radar

The Greer radar (KGSP), 131 km from the middle of the area, began a volume at 21:10 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, 9.1 hours before the alert went out and 178 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: 591 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 1104 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

000 
WUUS52 KFFC 092108
SVRFFC
GAC281-311-092200-
/O.NEW.KFFC.SV.W.0430.090909T2108Z-090909T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
508 PM EDT WED SEP 9 2009

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN TOWNS COUNTY IN NORTHEAST GEORGIA
  NORTHEASTERN WHITE COUNTY IN NORTHEAST GEORGIA

* UNTIL 600 PM EDT

* AT 507 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZED HAIL...AND
  DAMAGING WINDS UP TO 60 MPH.  THIS STORM WAS LOCATED NEAR MOUNTAIN
  SCENE...MOVING SOUTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED COUNTIES.

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 3488 8364 3487 8365 3481 8365 3479 8367
      3476 8362 3470 8362 3469 8363 3471 8366
      3487 8374 3490 8366
TIME...MOT...LOC 2108Z 334DEG 15KT 3485 8368

$$

1 follow-up statement

000 
WWUS52 KFFC 092131
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
531 PM EDT WED SEP 9 2009

GAC281-311-092141-
/O.CAN.KFFC.SV.W.0430.000000T0000Z-090909T2200Z/
WHITE GA-TOWNS GA-
531 PM EDT WED SEP 9 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN TOWNS AND
NORTHEASTERN WHITE COUNTIES IS CANCELLED...

THE SEVERE THUNDERSTORM HAS MOVED OUT OF TOWNS AND NORTHEASTERN 
WHITE COUNTIES AND SEVERE WEATHER IS NO LONGER EXPECTED.

IF YOU SAW WIND DAMAGE...LARGE HAIL OR SIGNIFICANT FLOODING...WAIT
UNTIL AFTER 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 3488 8364 3487 8365 3481 8365 3479 8367
      3476 8362 3470 8362 3469 8363 3471 8366
      3487 8374 3490 8366
TIME...MOT...LOC 2131Z 334DEG 15KT 3476 8363

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 9, 3:59 PM EDT	Severe Thunderstorm Warning	FFC	Catoosa	46 min
Sep 9, 4:43 PM EDT	Severe Thunderstorm Warning	FFC	Dawson, Forsyth, Hall	47 min
Sep 9, 5:44 PM EDT	Severe Thunderstorm Warning	FFC	Dawson, Lumpkin	35 min
Sep 9, 6:03 PM EDT	Severe Thunderstorm Warning	FFC	Forsyth, Gwinnett, Hall	31 min
Sep 9, 6:49 PM EDT	Severe Thunderstorm Warning	FFC	Fannin	41 min
Sep 9, 6:52 PM EDT	Severe Thunderstorm Warning	FFC	Banks, Hall, Jackson	38 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2009 Every severe thunderstorm warning in 2009

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.