Alert archive / Georgia / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 259, NWS Atlanta, GA

August 22, 20134 counties in Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Aug 22, 2013, 5:09 PM EDT for 4 counties in Georgia. It was in force for 51 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
Aug 22, 2013, 5:09 PM EDT (21:09 UTC)
Expired
Aug 22, 2013, 6:00 PM EDT
In force
51 min
Issued by
NWS Atlanta, GA
Area
Storm-based polygon

Counties Forsyth County, GA, Gwinnett County, GA, Hall County, GA, Jackson County, GA

The radar

The Atlanta radar (KFFC), 109 km from the middle of the area, began a volume at 21:08 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, 9.2 hours before the alert went out and 105 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 2013-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 824 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2013-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -35 square meters per square second.1939Sfc1 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
824 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
786 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-35 m²/s²
0-3 km storm-relative helicity
-30 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.

227 
WUUS52 KFFC 222109
SVRFFC
GAC117-135-139-157-222200-
/O.NEW.KFFC.SV.W.0259.130822T2109Z-130822T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
509 PM EDT THU AUG 22 2013

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN FORSYTH COUNTY IN NORTH CENTRAL GEORGIA
  NORTHEASTERN GWINNETT COUNTY IN NORTH CENTRAL GEORGIA
  SOUTHERN HALL COUNTY IN NORTH CENTRAL GEORGIA
  EXTREME WEST CENTRAL JACKSON COUNTY IN NORTHEAST GEORGIA

* UNTIL 600 PM EDT

* AT 504 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS UP TO 60
  MPH.  THIS STORM WAS LOCATED 6 MILES EAST OF CUMMING...MOVING
  SOUTHEAST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  BUFORD...REST HAVEN...FLOWERY BRANCH AND OAKWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU SEE WIND DAMAGE...HAIL OR 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. YOU CAN ALSO TWEET YOUR REPORT USING HASHTAG GAWX.

&&

LAT...LON 3425 8373 3411 8381 3412 8382 3403 8385
      3403 8386 3421 8416 3433 8408
TIME...MOT...LOC 2109Z 295DEG 8KT 3423 8403

$$
1 follow-up statement
866 
WWUS52 KFFC 222138
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
538 PM EDT THU AUG 22 2013

GAC117-222149-
/O.CAN.KFFC.SV.W.0259.000000T0000Z-130822T2200Z/
FORSYTH GA-
538 PM EDT THU AUG 22 2013

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN FORSYTH COUNTY IS
CANCELLED...

.

IF YOU SEE WIND DAMAGE...HAIL OR 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. YOU CAN ALSO TWEET YOUR REPORT USING HASHTAG GAWX.

LAT...LON 3425 8373 3411 8381 3412 8382 3403 8386
      3416 8407 3419 8405 3419 8399 3422 8396
      3423 8397 3424 8395 3430 8393
TIME...MOT...LOC 2139Z 295DEG 8KT 3420 8396

$$

GAC135-139-157-222200-
/O.CON.KFFC.SV.W.0259.000000T0000Z-130822T2200Z/
GWINNETT GA-HALL GA-JACKSON GA-
538 PM EDT THU AUG 22 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR EXTREME WEST CENTRAL JACKSON...SOUTHERN HALL AND NORTHEASTERN
GWINNETT COUNTIES...

AT 536 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 AQUALAND PARK...MOVING
SOUTHEAST AT 10 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO REST
HAVEN...FLOWERY BRANCH...OAKWOOD...CANDLER...CHESTNUT MOUNTAIN AND
ROAD ATLANTA-LANIER SPEEDWAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU SEE WIND DAMAGE...HAIL OR 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. YOU CAN ALSO TWEET YOUR REPORT USING HASHTAG GAWX.

&&

LAT...LON 3425 8373 3411 8381 3412 8382 3403 8386
      3416 8407 3419 8405 3419 8399 3422 8396
      3423 8397 3424 8395 3430 8393
TIME...MOT...LOC 2139Z 295DEG 8KT 3420 8396

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 8:10 PM EDTSpecial Weather StatementFFCStewart50 min
Aug 21, 10:26 PM EDTSpecial Weather StatementFFCCarroll, Douglas49 min
Aug 21, 11:15 PM EDTSpecial Weather StatementFFCDouglas60 min
Aug 22, 2:51 PM EDTSpecial Weather StatementFFCBanks24 min
Aug 22, 4:27 PM EDTSpecial Weather StatementFFCDawson33 min
Aug 22, 4:56 PM EDTFlash Flood WarningFFCDawson6 hr
Aug 22, 5:03 PM EDTSpecial Weather StatementFFCForsyth27 min
Aug 22, 5:37 PM EDTSpecial Weather StatementFFCGwinnett38 min
Aug 22, 5:59 PM EDTSpecial Weather StatementFFCBartow31 min
Aug 22, 6:38 PM EDTSpecial Weather StatementFFCFloyd22 min
Aug 22, 7:17 PM EDTSpecial Weather StatementFFCBartow28 min
Aug 22, 7:23 PM EDTSpecial Weather StatementFFCWashington37 min
Aug 22, 7:53 PM EDTSpecial Weather StatementFFCHaralson22 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2013Every severe thunderstorm warning in 2013

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.