Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 410, NWS Atlanta, GA

July 1, 2011Henry County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 1, 2011, 5:27 PM EDT for Henry County, Georgia. It was in force for 33 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 1, 2011, 5:27 PM EDT (21:27 UTC)
Expired: Jul 1, 2011, 6:00 PM EDT
In force: 33 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

County Henry County, GA

The radar

The Atlanta radar (KFFC), 42 km from the middle of the area, began a volume at 21:30 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, 9.5 hours before the alert went out and 36 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: 1954 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 1094 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 55 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.

749 
WUUS52 KFFC 012127
SVRFFC
GAC151-012200-
/O.NEW.KFFC.SV.W.0410.110701T2127Z-110701T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
527 PM EDT FRI JUL 1 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN HENRY COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 600 PM EDT

* AT 522 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
  MCDONOUGH...MOVING SOUTH AT 5 MPH.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

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 3350 8421 3348 8400 3336 8401 3336 8403
      3333 8404 3331 8406 3332 8407 3330 8408
      3330 8413 3334 8415 3334 8425 3336 8426
TIME...MOT...LOC 2127Z 008DEG 6KT 3343 8414

$$

1 follow-up statement

393 
WWUS52 KFFC 012159
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
559 PM EDT FRI JUL 1 2011

GAC151-012209-
/O.EXP.KFFC.SV.W.0410.000000T0000Z-110701T2200Z/
HENRY GA-
559 PM EDT FRI JUL 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN HENRY COUNTY WILL BE 
ALLOWED TO EXPIRE AT 600 PM EDT...

AT 553 PM EDT...THE THUNDERSTORM THAT EARLIER PROMPTED THE WARNING 
FOR HENRY COUNTY HAS DROPPED BELOW SEVERE LIMITS. MODERATE TO HEAVY 
RAIN AND FREQUENT CLOUD-TO-GROUND LIGHTNING WILL CONTINUE ACROSS 
CENTRAL AND SOUTHERN HENRY COUNTY FOR ANOTHER 15 TO 30 MINUTES.

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 3350 8421 3348 8400 3336 8401 3336 8403
      3333 8404 3331 8406 3332 8407 3330 8408
      3330 8413 3334 8415 3334 8425 3336 8426
TIME...MOT...LOC 2159Z 008DEG 6KT 3338 8415

$$



19

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:16 PM EDT	Severe Thunderstorm Warning	FFC	Johnson, Laurens, Treutlen	44 min
Jun 30, 9:24 PM EDT	Special Weather Statement	FFC	Twiggs	36 min
Jun 30, 9:56 PM EDT	Special Weather Statement	FFC	Bibb, Twiggs	49 min
Jul 1, 2:52 PM EDT	Special Weather Statement	FFC	Bleckley	38 min
Jul 1, 3:23 PM EDT	Special Weather Statement	FFC	Baldwin	37 min
Jul 1, 3:24 PM EDT	Special Weather Statement	FFC	Lamar	36 min
Jul 1, 3:28 PM EDT	Special Weather Statement	FFC	Meriwether	32 min
Jul 1, 3:49 PM EDT	Special Weather Statement	FFC	Washington	26 min
Jul 1, 4:05 PM EDT	Special Weather Statement	FFC	Fulton	25 min
Jul 1, 4:41 PM EDT	Special Weather Statement	FFC	Chattahoochee	34 min
Jul 1, 4:45 PM EDT	Special Weather Statement	FFC	Spalding	30 min
Jul 1, 4:48 PM EDT	Special Weather Statement	FFC	Spalding	27 min
Jul 1, 5:22 PM EDT	Special Weather Statement	FFC	Henry	38 min
Jul 1, 5:25 PM EDT	Severe Thunderstorm Warning	FFC	Coweta, Fayette	35 min
Jul 1, 5:56 PM EDT	Special Weather Statement	FFC	Jones	34 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.