Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 19, NWS Atlanta, GA

February 28, 20119 counties in Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Feb 28, 2011, 5:16 PM EST for 9 counties in Georgia. It was in force for 44 min. 6 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
Feb 28, 2011, 5:16 PM EST (22:16 UTC)
Expired
Feb 28, 2011, 6:00 PM EST
In force
44 min
Issued by
NWS Atlanta, GA
Area
Storm-based polygon

Counties Banks County, GA, Barrow County, GA, Clarke County, GA, Gwinnett County, GA, Hall County, GA, Jackson County, GA, Madison County, GA, Oconee County, GA, Walton County, GA

The radar

The Atlanta radar (KFFC), 124 km from the middle of the area, began a volume at 22:17 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

TimeReportWhereRemark
Feb 28, 5:25 PM ESTTSTM WND DMGHomer, GABANKS COUNTY EMERGENCY MANAGEMENT REPORTED MULTIPLE DOWNED TREES. A STORAGE SHED AND STORE SIGNS WERE BLOWN ONTO US 441.
Feb 28, 5:25 PM ESTTSTM WND DMGMaysville, GABANKS COUNTY EMERGENCY MANAGEMENT RELAYED REPORTS THAT DOWNTOWN MAYSVILLE HAD POWER OUT.
Feb 28, 5:30 PM ESTHAIL 0.5Dacula, GAEMERGENCY MANAGER OF GWINNETT COUNTY HAS REPORTED DIME-SIZED HAIL IN DACULA GEORGIA ON HWY 124.
Feb 28, 5:37 PM ESTTSTM WND DMGWinder, GAPUBLIC REPORTED A COUPLE OF TREES DOWN IN WINDER.
Feb 28, 5:45 PM ESTTSTM WND DMGLawrenceville, GATHE 911 CENTER OF GWINNETT COUNTY REPORTED A TREE DOWN ON A HOUSE IN LAWRENCEVILLE ON GUARDIAN WAY.
Feb 28, 5:52 PM ESTTSTM WND DMGDanielsville, GAMADISON COUNTY 911 RELAYED REPORTS OF WIDESPREAD TREE DAMAGE IN THE COUNTY. MORE THAN A DOZEN TREES WERE DOWNED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Feb 28, 1:29 PM ESTTornado WatchSPC7 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.3 hours before the alert went out and 119 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-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 12:00Z on 2011-02-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 12:00Z on 2011-02-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 229 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1162 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
229 m²/s²
0-3 km storm-relative helicity
350 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.

777 
WUUS52 KFFC 282216
SVRFFC
GAC011-013-059-135-139-157-195-219-297-282300-
/O.NEW.KFFC.SV.W.0019.110228T2216Z-110228T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
516 PM EST MON FEB 28 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BARROW COUNTY IN NORTH CENTRAL GEORGIA
  GWINNETT COUNTY IN NORTH CENTRAL GEORGIA
  SOUTHERN HALL COUNTY IN NORTH CENTRAL GEORGIA
  NORTHERN WALTON COUNTY IN NORTH CENTRAL GEORGIA
  BANKS COUNTY IN NORTHEAST GEORGIA
  CLARKE COUNTY IN NORTHEAST GEORGIA
  JACKSON COUNTY IN NORTHEAST GEORGIA
  MADISON COUNTY IN NORTHEAST GEORGIA
  NORTHWESTERN OCONEE COUNTY IN NORTHEAST GEORGIA

* UNTIL 600 PM EST

* AT 513 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS UP
  TO 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
  ALTO TO FLOWERY BRANCH TO NORCROSS...MOVING EAST AT 60 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HOMER...TALMO...LILBURN...MAYSVILLE...PENDERGRASS...BRASELTON...
  HOSCHTON...LAWRENCEVILLE...DACULA...AUBURN...CARL...SNELLVILLE...
  COMMERCE...JEFFERSON...GRAYSON...WINDER...ARCADE...LOGANVILLE...
  NICHOLSON...BETHLEHEM...ILA...STATHAM...BETWEEN...BOGART...
  DANIELSVILLE...MONROE...HULL...ATHENS...COLBERT AND GOOD HOPE.

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 3446 8339 3433 8339 3425 8333 3425 8317
      3427 8311 3423 8307 3417 8309 3413 8306
      3374 8368 3388 8422 3394 8427 3400 8423
      3400 8419 3405 8412 3409 8412 3419 8404
      3420 8398 3428 8391 3445 8365 3449 8355
TIME...MOT...LOC 2216Z 291DEG 52KT 3443 8344 3417 8384
          3395 8422

$$

16
1 follow-up statement
201 
WWUS52 KFFC 282251
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
551 PM EST MON FEB 28 2011

GAC011-139-282258-
/O.CAN.KFFC.SV.W.0019.000000T0000Z-110228T2300Z/
BANKS GA-HALL GA-
551 PM EST MON FEB 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN HALL AND BANKS 
COUNTIES HAS BEEN CANCELLED...

MODERATE TO HEAVY RAIN AND OCCASIONAL CLOUD-TO-GROUND LIGHTNING WILL 
CONTINUE ACROSS SOUTHERN HALL AND MUCH OF BANKS COUNTIES DURING THE 
NEXT HOUR...BUT THE SEVERE THUNDERSTORMS HAVE MOVED SOUTH INTO 
GWINNETT...JACKSON...BARROW..AND MADISON COUNTIES.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EST MONDAY EVENING FOR
NORTHERN GEORGIA.

A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 1000 PM EST
MONDAY EVENING FOR NORTHERN GEORGIA.

LAT...LON 3426 8356 3426 8349 3420 8340 3425 8333
      3427 8311 3423 8307 3417 8309 3413 8306
      3374 8368 3388 8422 3394 8427 3400 8423
      3400 8419 3405 8412 3409 8412 3417 8405
      3410 8385 3430 8362
TIME...MOT...LOC 2248Z 291DEG 52KT 3426 8292 3400 8332
          3378 8370

$$

GAC013-059-135-157-195-219-297-282300-
/O.CON.KFFC.SV.W.0019.000000T0000Z-110228T2300Z/
WALTON GA-OCONEE GA-CLARKE GA-BARROW GA-GWINNETT GA-MADISON GA-
JACKSON GA-
551 PM EST MON FEB 28 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EST
FOR JACKSON...MADISON...GWINNETT...BARROW...NORTHERN CLARKE...
NORTHWESTERN OCONEE AND NORTHERN WALTON COUNTIES...

AT 545 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS UP TO 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING 
FROM COMMERCE...TO HOG MOUNTAIN...TO NORCROSS...MOVING EAST AT 60 
MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
ATHENS...EASTVILLE...PANNELL...COLBERT AND GOOD HOPE.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EST MONDAY EVENING FOR
NORTHERN GEORGIA.

A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 1000 PM EST
MONDAY EVENING FOR NORTHERN GEORGIA.

&&

LAT...LON 3426 8356 3426 8349 3420 8340 3425 8333
      3427 8311 3423 8307 3417 8309 3413 8306
      3374 8368 3388 8422 3394 8427 3400 8423
      3400 8419 3405 8412 3409 8412 3417 8405
      3410 8385 3430 8362
TIME...MOT...LOC 2248Z 291DEG 52KT 3426 8292 3400 8332
          3378 8370

$$



19

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 28, 4:04 AM ESTWind AdvisoryFFCBaldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 90 more15 hr
Feb 28, 2:25 PM ESTSevere Thunderstorm WarningFFCCatoosa, Dade, Walker50 min
Feb 28, 2:45 PM ESTSevere Thunderstorm WarningFFCMurray, Whitfield45 min
Feb 28, 3:08 PM ESTSevere Thunderstorm WarningFFCChattooga, Dade, Floyd, Walker37 min
Feb 28, 3:13 PM ESTSevere Thunderstorm WarningFFCFannin, Gilmer32 min
Feb 28, 3:29 PM ESTSevere Thunderstorm WarningFFCTowns, Union31 min
Feb 28, 3:42 PM ESTSevere Thunderstorm WarningFFCBartow, Chattooga, Floyd, Gordon48 min
Feb 28, 3:50 PM ESTSevere Thunderstorm WarningFFCBartow, Floyd, Polk25 min
Feb 28, 4:09 PM ESTSevere Thunderstorm WarningFFCBartow, Cherokee, Pickens51 min
Feb 28, 4:17 PM ESTSevere Thunderstorm WarningFFCBartow, Floyd13 min
Feb 28, 4:32 PM ESTTornado WarningFFCBartow, Cherokee, Cobb, Paulding28 min
Feb 28, 4:40 PM ESTSevere Thunderstorm WarningFFCDawson, Forsyth, Hall50 min
Feb 28, 4:56 PM ESTTornado WarningFFCCherokee, Cobb, Forsyth, Fulton35 min
Feb 28, 5:04 PM ESTSevere Thunderstorm WarningFFCCarroll, Haralson, Paulding, Polk41 min
Feb 28, 5:49 PM ESTSevere Thunderstorm WarningFFCCarroll, Cobb, Douglas, Fulton, Paulding41 min
Feb 28, 5:55 PM ESTTornado WarningFFCDouglas, Fulton35 min
Feb 28, 6:12 PM ESTSevere Thunderstorm WarningFFCClayton, DeKalb, Henry, Newton, Rockdale33 min
Feb 28, 6:36 PM ESTSevere Thunderstorm WarningFFCMeriwether, Troup39 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2011Every 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.