Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 452, NWS Atlanta, GA

July 31, 2011Washington County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 31, 2011, 8:46 PM EDT for Washington County, Georgia. It was in force for 29 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: Jul 31, 2011, 8:46 PM EDT (00:46 UTC)
Expired: Jul 31, 2011, 9:15 PM EDT
In force: 29 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

County Washington County, GA

The radar

The Robins AFB radar (KJGX), 49 km from the middle of the area, began a volume at 00:45 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 00:00Z, 0.8 hours before the alert went out and 154 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: 1266 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1675 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 29 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.

592 
WUUS52 KFFC 010046
SVRFFC
GAC303-010115-
/O.NEW.KFFC.SV.W.0452.110801T0046Z-110801T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
846 PM EDT SUN JUL 31 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL WASHINGTON COUNTY IN EAST CENTRAL GEORGIA

* UNTIL 915 PM EDT

* AT 838 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS UP TO 60
  MPH.  THIS STORM WAS LOCATED NEAR DEEPSTEP...MOVING SOUTH AT 15
  MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF WESTERN WASHINGTON COUNTY.

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 3286 8285 3287 8302 3304 8301 3304 8291
TIME...MOT...LOC 0046Z 002DEG 13KT 3296 8296

$$

1 follow-up statement

799 
WWUS52 KFFC 010107
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
907 PM EDT SUN JUL 31 2011

GAC303-010115-
/O.CON.KFFC.SV.W.0452.000000T0000Z-110801T0115Z/
WASHINGTON GA-
907 PM EDT SUN JUL 31 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR WEST CENTRAL WASHINGTON COUNTY...

AT 903 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS UP
TO 60 MPH. THIS STORM WAS LOCATED NEAR HEBRON...MOVING SOUTH AT 10 
MPH.  THE STORM IS EXPECTED TO WEAKEN AND THE WARNING WILL BE 
ALLOWED TO EXPIRE AT 915 PM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU SEE 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 3286 8285 3287 8302 3304 8301 3304 8291
TIME...MOT...LOC 0107Z 008DEG 10KT 3291 8299

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:07 PM EDT	Special Weather Statement	FFC	Putnam	23 min
Jul 31, 8:09 PM EDT	Special Weather Statement	FFC	Crisp	36 min
Jul 31, 8:38 PM EDT	Special Weather Statement	FFC	Macon	22 min
Jul 31, 8:43 PM EDT	Special Weather Statement	FFC	Washington	17 min
Jul 31, 9:04 PM EDT	Special Weather Statement	FFC	Macon	21 min
Jul 31, 9:21 PM EDT	Special Weather Statement	FFC	Lamar, Upson	24 min
Jul 31, 10:51 PM EDT	Special Weather Statement	FFC	Taylor	24 min
Aug 1, 12:16 AM EDT	Special Weather Statement	FFC	Sumter	29 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.