Alert archive / Georgia / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 189, NWS Atlanta, GA
NWS Atlanta, GA issued this severe thunderstorm warning at Apr 21, 2011, 3:08 AM EDT for 6 counties in Georgia. It was in force for 52 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
- Apr 21, 2011, 3:08 AM EDT (07:08 UTC)
- Expired
- Apr 21, 2011, 4:00 AM EDT
- In force
- 52 min
- Issued by
- NWS Atlanta, GA
- Area
- Storm-based polygon
Counties Cherokee County, GA, Dawson County, GA, DeKalb County, GA, Forsyth County, GA, Fulton County, GA, Gwinnett County, GA
The radar
The Atlanta radar (KFFC), 98 km from the middle of the area, began a volume at 07:11 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 21, 2:32 AM EDT | Severe Thunderstorm Watch | SPC | 2 hr |
The nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 7.1 hours before the alert went out and 95 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.
- Mixed-layer CAPE
- 316 J/kg
- Mixed-layer CIN
- -171 J/kg
- Mixed-layer LCL
- 1406 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 108 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
181
WUUS52 KFFC 210708
SVRFFC
GAC057-085-089-117-121-135-210800-
/O.NEW.KFFC.SV.W.0189.110421T0708Z-110421T0800Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
308 AM EDT THU APR 21 2011
THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CHEROKEE COUNTY IN NORTH CENTRAL GEORGIA
SOUTHERN DAWSON COUNTY IN NORTH CENTRAL GEORGIA
NORTHWESTERN DEKALB COUNTY IN NORTH CENTRAL GEORGIA
FORSYTH COUNTY IN NORTH CENTRAL GEORGIA
NORTHEASTERN FULTON COUNTY IN NORTH CENTRAL GEORGIA
GWINNETT COUNTY IN NORTH CENTRAL GEORGIA
* UNTIL 400 AM EDT
* AT 307 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZED
HAIL...AND DAMAGING WINDS UP TO 60 MPH. THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM BALL GROUND TO ALPHARETTA TO
CHAMBLEE...MOVING EAST AT 55 MPH.
* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
MILTON...DORAVILLE...FREE HOME...NORCROSS...BERKELEY LAKE...JOHNS
CREEK...DULUTH...LILBURN...CUMMING...SUWANEE...SUGAR HILL...
BUFORD...LAWRENCEVILLE...REST HAVEN AND DACULA.
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 3442 8398 3428 8393 3427 8396 3420 8398
3419 8405 3417 8406 3409 8386 3411 8382
3400 8387 3393 8380 3391 8383 3385 8445
3392 8444 3398 8437 3407 8442 3408 8449
3440 8465 3437 8439 3438 8426 3441 8426
TIME...MOT...LOC 0708Z 264DEG 47KT 3430 8441 3408 8431
3389 8431
$$3 follow-up statements
165
WWUS52 KFFC 210732
SVSFFC
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
332 AM EDT THU APR 21 2011
GAC057-210741-
/O.CAN.KFFC.SV.W.0189.000000T0000Z-110421T0800Z/
CHEROKEE GA-
332 AM EDT THU APR 21 2011
...THE SEVERE THUNDERSTORM WARNING FOR CHEROKEE COUNTY IS
CANCELLED...
THE STORM THAT PROMPTED THE WARNING HAS EXITED CHEROKEE COUNTY.
IF YOU SEE WIND DAMAGE...LARGE HAIL OR SIGNIFICANT FLOODING...WAIT
UNTIL AFTER THE STORM HAS PASSED...AND THEN CALL THE NATIONAL WEATHER
SERVICE TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 AM EDT
THURSDAY MORNING FOR NORTHERN GEORGIA.
LAT...LON 3442 8398 3428 8393 3427 8396 3420 8398
3419 8405 3417 8406 3409 8386 3410 8382
3400 8387 3393 8380 3391 8383 3385 8445
3392 8444 3398 8437 3410 8442 3413 8436
3419 8433 3419 8426 3441 8426
TIME...MOT...LOC 0731Z 264DEG 47KT 3433 8405 3411 8395
3392 8395
$$
GAC085-089-117-121-135-210800-
/O.CON.KFFC.SV.W.0189.000000T0000Z-110421T0800Z/
DAWSON GA-DEKALB GA-FORSYTH GA-GWINNETT GA-FULTON GA-
332 AM EDT THU APR 21 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 AM EDT
FOR NORTHEASTERN FULTON...GWINNETT...FORSYTH...NORTHWESTERN DEKALB
AND SOUTHERN DAWSON COUNTIES...
AT 325 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZED HAIL...AND DAMAGING WINDS UP TO 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM SILVER CITY TO SUGAR HILL TO
LAWRENCEVILLE...MOVING EAST AT 45 MPH.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
LUMPKIN...HOG MOUNTAIN...CHESTATEE...OSCARVILLE...DACULA...WAR HILL
PARK AND HARBIN.
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 SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 AM EDT
THURSDAY MORNING FOR NORTHERN GEORGIA.
&&
LAT...LON 3442 8398 3428 8393 3427 8396 3420 8398
3419 8405 3417 8406 3409 8386 3410 8382
3400 8387 3393 8380 3391 8383 3385 8445
3392 8444 3398 8437 3410 8442 3413 8436
3419 8433 3419 8426 3441 8426
TIME...MOT...LOC 0731Z 264DEG 47KT 3433 8405 3411 8395
3392 8395
$$998
WWUS52 KFFC 210742
SVSFFC
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
342 AM EDT THU APR 21 2011
GAC089-121-210751-
/O.CAN.KFFC.SV.W.0189.000000T0000Z-110421T0800Z/
DEKALB GA-FULTON GA-
342 AM EDT THU APR 21 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN FULTON AND
NORTHWESTERN DEKALB COUNTIES IS CANCELLED...
THE STORM THAT PROMPTED THE WARNING HAS EXITED FULTON AND DEKALB
COUNTIES.
IF YOU SEE WIND DAMAGE...LARGE HAIL OR SIGNIFICANT FLOODING...WAIT
UNTIL AFTER THE STORM HAS PASSED...AND THEN CALL THE NATIONAL WEATHER
SERVICE TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 AM EDT
THURSDAY MORNING FOR NORTHERN GEORGIA.
LAT...LON 3442 8398 3428 8393 3427 8396 3420 8398
3419 8405 3417 8406 3410 8383 3400 8387
3393 8380 3391 8383 3387 8421 3393 8427
3398 8426 3400 8423 3399 8420 3403 8417
3405 8410 3411 8426 3441 8426
TIME...MOT...LOC 0741Z 264DEG 47KT 3434 8389 3412 8379
3393 8379
$$
GAC085-117-135-210800-
/O.CON.KFFC.SV.W.0189.000000T0000Z-110421T0800Z/
DAWSON GA-FORSYTH GA-GWINNETT GA-
342 AM EDT THU APR 21 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 AM EDT
FOR GWINNETT...FORSYTH AND SOUTHERN DAWSON COUNTIES...
AT 339 AM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING QUARTER SIZED HAIL...AND DAMAGING WINDS UP TO 60 MPH.
THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM WAR HILL PARK
TO 8 MILES NORTHEAST OF HOG MOUNTAIN TO HARBIN...MOVING EAST AT 45
MPH. THESE STORMS HAVE WEAKENED AND WILL LIKELY CONTINUE TO DO SO.
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 SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 AM EDT
THURSDAY MORNING FOR NORTHERN GEORGIA.
&&
LAT...LON 3442 8398 3428 8393 3427 8396 3420 8398
3419 8405 3417 8406 3410 8383 3400 8387
3393 8380 3391 8383 3387 8421 3393 8427
3398 8426 3400 8423 3399 8420 3403 8417
3405 8410 3411 8426 3441 8426
TIME...MOT...LOC 0741Z 264DEG 47KT 3434 8389 3412 8379
3393 8379
$$884
WWUS52 KFFC 210752
SVSFFC
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
352 AM EDT THU APR 21 2011
GAC085-117-135-210801-
/O.EXP.KFFC.SV.W.0189.000000T0000Z-110421T0800Z/
DAWSON GA-FORSYTH GA-GWINNETT GA-
352 AM EDT THU APR 21 2011
...THE SEVERE THUNDERSTORM WARNING FOR GWINNETT...FORSYTH AND
SOUTHERN DAWSON COUNTIES WILL BE ALLOWED TO EXPIRE AT 400 AM EDT...
AT 349 AM EDT...A LINE OF STRONG THUNDERSTORMS WAS REPORTED. THESE
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 12 MILES EAST OF WAR
HILL PARK TO 16 MILES EAST OF HOG MOUNTAIN TO 11 MILES EAST OF
HARBIN...MOVING EAST AT 55 MPH.
THE STORMS THAT PROMPTED THE WARNING HAVE MOVED OUT OF THE WARNED
AREA...THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE AT 4 AM.
IF YOU SEE WIND DAMAGE...LARGE HAIL OR SIGNIFICANT FLOODING...WAIT
UNTIL AFTER THE STORM HAS PASSED...AND THEN CALL THE NATIONAL WEATHER
SERVICE TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 AM EDT
THURSDAY MORNING FOR NORTHERN GEORGIA.
LAT...LON 3442 8398 3428 8393 3427 8396 3420 8398
3419 8405 3417 8406 3410 8383 3400 8387
3393 8380 3391 8383 3387 8421 3393 8427
3398 8426 3400 8423 3399 8420 3403 8417
3405 8410 3411 8426 3441 8426
TIME...MOT...LOC 0751Z 264DEG 47KT 3435 8373 3413 8363
3394 8363
$$The office that day
Everything else NWS Atlanta, GA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 1:54 AM EDT | Severe Thunderstorm Warning | FFC | Carroll, Haralson | 51 min |
| Apr 21, 2:06 AM EDT | Severe Thunderstorm Warning | FFC | Bartow, Floyd, Polk | 39 min |
| Apr 21, 2:27 AM EDT | Severe Thunderstorm Warning | FFC | Carroll, Coweta, Douglas, Fulton, Heard | 48 min |
| Apr 21, 2:46 AM EDT | Severe Thunderstorm Warning | FFC | Cobb, Douglas, Fulton, Paulding | 44 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.