Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 231, NWS Atlanta, GA

May 13, 2011Harris County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at May 13, 2011, 6:58 PM EDT for Harris County, Georgia. It was in force for 20 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: May 13, 2011, 6:58 PM EDT (22:58 UTC)
Expired: May 13, 2011, 7:18 PM EDT
In force: 20 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

County Harris County, GA

The radar

The Atlanta radar (KFFC), 73 km from the middle of the area, began a volume at 22:58 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
May 13, 7:03 PM EDT	TSTM WND DMG	1 Wsw Cataula, GA	HARRIS COUNTY 911 RELAYED REPORTS OF SEVERAL DOWNED TREES IN AN AREA FROM THE HARRIS-MUSCOGEE COUNTY LINE TO CATAULA.

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, 11.0 hours before the alert went out and 76 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: 696 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1122 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -33 m²/s²
0-3 km storm-relative helicity: 32 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.

965 
WUUS52 KFFC 132258
SVRFFC
GAC145-132345-
/O.NEW.KFFC.SV.W.0231.110513T2258Z-110513T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
658 PM EDT FRI MAY 13 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HARRIS COUNTY IN WEST CENTRAL GEORGIA

* UNTIL 745 PM EDT

* AT 653 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS UP TO 60
  MPH.  THIS STORM WAS LOCATED 11 MILES SOUTHWEST OF HAMILTON...
  MOVING NORTHEAST AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  WAVERLY HALL AND SHILOH.

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 3271 8499 3286 8474 3285 8471 3283 8469
      3274 8470 3273 8468 3272 8470 3270 8470
      3260 8469 3261 8504
TIME...MOT...LOC 2258Z 245DEG 25KT 3266 8496

$$

1 follow-up statement

483 
WWUS52 KFFC 132318
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
718 PM EDT FRI MAY 13 2011

GAC145-132328-
/O.CAN.KFFC.SV.W.0231.000000T0000Z-110513T2345Z/
HARRIS GA-
718 PM EDT FRI MAY 13 2011

...THE SEVERE THUNDERSTORM WARNING FOR HARRIS COUNTY IS CANCELLED...

THE THUNDERSTORM HAS WEAKENED AND IS NO LONGER EXPECTED TO PRODUCE 
SEVERE WEATHER. HOWEVER...STRONG GUSTY WINDS UP TO 45 MPH...VERY 
HEAVY RAIN...AND SMALL HAIL ARE STILL POSSIBLE WITH THIS STORM AS IT 
MOVES INTO NORTHEASTERN HARRIS COUNTY.

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 3271 8499 3286 8474 3285 8471 3283 8469
      3274 8470 3273 8468 3272 8470 3270 8470
      3260 8469 3261 8504
TIME...MOT...LOC 2318Z 245DEG 25KT 3272 8481

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 13, 12:55 PM EDT	Special Weather Statement	FFC	Dade	50 min
May 13, 1:30 PM EDT	Special Weather Statement	FFC	Catoosa, Walker	45 min
May 13, 1:46 PM EDT	Severe Thunderstorm Warning	FFC	Chattooga, Floyd	44 min
May 13, 2:09 PM EDT	Special Weather Statement	FFC	Catoosa, Whitfield	51 min
May 13, 2:28 PM EDT	Special Weather Statement	FFC	Floyd, Gordon, Polk	47 min
May 13, 2:48 PM EDT	Special Weather Statement	FFC	Walker	27 min
May 13, 2:49 PM EDT	Special Weather Statement	FFC	Haralson	26 min
May 13, 2:56 PM EDT	Special Weather Statement	FFC	Murray	49 min
May 13, 3:07 PM EDT	Special Weather Statement	FFC	Gilmer, Pickens	38 min
May 13, 3:45 PM EDT	Special Weather Statement	FFC	Fannin	45 min
May 13, 3:55 PM EDT	Special Weather Statement	FFC	Forsyth	50 min
May 13, 4:39 PM EDT	Special Weather Statement	FFC	White	36 min
May 13, 6:10 PM EDT	Special Weather Statement	FFC	Chattahoochee, Muscogee	65 min
May 13, 6:28 PM EDT	Special Weather Statement	FFC	Harris	47 min
May 13, 6:48 PM EDT	Special Weather Statement	FFC	Chattahoochee, Harris, Muscogee	42 min
May 13, 7:10 PM EDT	Special Weather Statement	FFC	Talbot	35 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.