Alert archive / Georgia / Flash Flood Warnings in 2012

Flash Flood Warning 9, NWS Atlanta, GA

March 3, 2012Gwinnett County, Georgia

NWS Atlanta, GA issued this flash flood warning at Mar 3, 2012, 4:11 AM EST for Gwinnett County, Georgia. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 3, 2012, 4:11 AM EST (09:11 UTC)
Expired: Mar 3, 2012, 10:00 AM EST
In force: 6 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

County Gwinnett County, GA

The radar

The Atlanta radar (KFFC), 78 km from the middle of the area, began a volume at 09:11 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 nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 9.2 hours before the alert went out and 74 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: 540 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 948 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 212 m²/s²
0-3 km storm-relative helicity: 274 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 4.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

053 
WGUS52 KFFC 030911
FFWFFC
GAC135-031500-
/O.NEW.KFFC.FF.W.0009.120303T0911Z-120303T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
411 AM EST SAT MAR 3 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN GWINNETT COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 1000 AM EST

* AT 405 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  OCCASIONAL HEAVY RAIN HAS CAUSED 2 TO 3 INCHES OF RAIN IN CENTRAL
  AND SOUTH GWINNETT COUNTY THIS MORNING. RAPID RISES ARE OCCURRING  
  ON SWEETWATER CREEK...PEW CREEK AND NO BUSINESS CREEK. THESE AND   
  OTHER CREEKS IN THE WARNED AREA MAY EXPERIENCE FLASH FLOODING      
  DURING THE NEXT FEW HOURS. ADDITIONAL RAINFALL AMOUNTS UP ONE INCH 
  CAN BE EXPECTED OVER THE WARNED AREA THROUGH 700 AM EST.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NORCROSS...
  LAWRENCEVILLE AND DACULA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

IF YOU SEE SIGNIFICANT FLOODING 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 3400 8387 3399 8384 3393 8380 3376 8402
      3376 8403 3377 8407 3386 8416 3388 8421
      3392 8426 3396 8428 3397 8425 3402 8386

$$

16

2 follow-up statements

790 
WGUS72 KFFC 031128
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
628 AM EST SAT MAR 3 2012

GAC135-031500-
/O.CON.KFFC.FF.W.0009.000000T0000Z-120303T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GWINNETT GA-
628 AM EST SAT MAR 3 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 AM EST FOR
SOUTHERN GWINNETT COUNTY...

AT 620 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE LIGHT TO MODERATE RAIN PASSING OVER THE WARNED AREA. 
RAINFALL AMOUNTS OF 2 TO 3 INCHES HAS OCCURRED THIS MORNING WHICH 
HAS CAUSED MOST CREEKS IN GWINNETT COUNTY TO REACH BANKFULL 
CONDITIONS. THE SWEETWATER CREEK AND THE UPPER HEADWATERS OF THE 
ALCOVY RIVER ARE WITHIN ONE FOOT OF FLOOD STAGE. ADDITIONAL RAINFALL 
AMOUNTS OF ONE HALF TO ONE INCH THROUGH 900 AM EST MAY CAUSE THE 
CREEK AND RIVER TO REACH FLOOD STAGE AND CAUSE MINOR FLOODING. THE 
FLASH FLOOD WARNING WILL CONTINUE.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
NORCROSS...LAWRENCEVILLE AND DACULA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY...THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

IF YOU SEE SIGNIFICANT FLOODING 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 3400 8387 3399 8384 3393 8380 3376 8402
      3376 8403 3377 8407 3386 8416 3388 8421
      3392 8426 3396 8428 3397 8425 3402 8386

$$

16

942 
WGUS72 KFFC 031452
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
952 AM EST SAT MAR 3 2012

GAC135-031501-
/O.EXP.KFFC.FF.W.0009.000000T0000Z-120303T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GWINNETT GA-
952 AM EST SAT MAR 3 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1000 AM EST FOR SOUTHERN
GWINNETT COUNTY...

THE MODERATE TO HEAVY RAIN HAS MOVED OUT OF THE AREA AND THE FLASH 
FLOOD THREAT HAS ENDED. HOWEVER...CREEKS AND RIVERS IN GWINNETT 
COUNTY WILL CONTINUE TO SEE HIGH WATER LEVELS WITH SWIFT CURRENTS 
THROUGH THE REST OF THIS MORNING INTO THE AFTERNOON. 

IF YOU SEE SIGNIFICANT FLOODING 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 3400 8387 3399 8384 3393 8380 3376 8402
      3376 8403 3377 8407 3386 8416 3388 8421
      3392 8426 3396 8428 3397 8425 3402 8386

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 2, 7:01 PM EST	Special Weather Statement	FFC	Coweta, Heard	44 min
Mar 2, 7:24 PM EST	Severe Thunderstorm Warning	FFC	Catoosa, Murray, Walker, Whitfield	21 min
Mar 2, 7:33 PM EST	Tornado Warning	FFC	Haralson, Polk	42 min
Mar 2, 7:37 PM EST	Special Weather Statement	FFC	Floyd	38 min
Mar 2, 8:14 PM EST	Tornado Warning	FFC	Haralson, Paulding, Polk	46 min
Mar 2, 8:28 PM EST	Special Weather Statement	FFC	Gordon	32 min
Mar 2, 8:34 PM EST	Severe Thunderstorm Warning	FFC	Floyd	41 min
Mar 2, 8:40 PM EST	Tornado Warning	FFC	Cherokee, Cobb, Paulding	50 min
Mar 2, 8:52 PM EST	Tornado Warning	FFC	Floyd	53 min
Mar 2, 9:11 PM EST	Tornado Warning	FFC	Cherokee, Cobb, DeKalb, Forsyth, Fulton, Gwinnett and 1 more	49 min
Mar 2, 9:26 PM EST	Tornado Warning	FFC	Bartow	35 min
Mar 2, 9:39 PM EST	Tornado Warning	FFC	Barrow, Forsyth, Gwinnett, Hall, Jackson	51 min
Mar 2, 9:43 PM EST	Special Weather Statement	FFC	Fannin	32 min
Mar 2, 10:14 PM EST	Special Weather Statement	FFC	Gordon	46 min
Mar 2, 10:17 PM EST	Special Weather Statement	FFC	Banks	43 min
Mar 2, 10:23 PM EST	Special Weather Statement	FFC	Pickens	52 min
Mar 2, 10:30 PM EST	Severe Thunderstorm Warning	FFC	Cherokee, Dawson, Forsyth, Pickens	33 min
Mar 2, 10:35 PM EST	Severe Thunderstorm Warning	FFC	Gordon	40 min
Mar 2, 10:40 PM EST	Special Weather Statement	FFC	White	50 min
Mar 2, 10:46 PM EST	Severe Thunderstorm Warning	FFC	Gordon	44 min
Mar 2, 10:53 PM EST	Tornado Warning	FFC	Dawson, Forsyth, Hall, Lumpkin, White	37 min
Mar 2, 10:59 PM EST	Severe Thunderstorm Warning	FFC	Chattooga, Floyd	51 min
Mar 2, 11:19 PM EST	Flash Flood Warning	FFC	Chattooga, Floyd, Gordon	4 hr
Mar 2, 11:31 PM EST	Special Weather Statement	FFC	White	14 min
Mar 2, 11:42 PM EST	Special Weather Statement	FFC	Pickens	33 min
Mar 3, 12:11 AM EST	Flash Flood Warning	FFC	Gilmer, Pickens	5 hr
Mar 3, 12:15 AM EST	Tornado Warning	FFC	Troup	45 min
Mar 3, 12:16 AM EST	Special Weather Statement	FFC	Floyd, Polk	29 min
Mar 3, 12:51 AM EST	Severe Thunderstorm Warning	FFC	Haralson, Paulding, Polk	39 min
Mar 3, 12:56 AM EST	Severe Thunderstorm Warning	FFC	Coweta, Meriwether	11 min
Mar 3, 1:07 AM EST	Special Weather Statement	FFC	Madison	23 min
Mar 3, 1:14 AM EST	Special Weather Statement	FFC	Carroll, Cobb, Douglas	46 min
Mar 3, 1:21 AM EST	Special Weather Statement	FFC	DeKalb, Fulton	24 min
Mar 3, 1:29 AM EST	Severe Thunderstorm Warning	FFC	DeKalb, Fulton	31 min
Mar 3, 1:42 AM EST	Severe Thunderstorm Warning	FFC	Gwinnett, Walton	33 min
Mar 3, 1:44 AM EST	Special Weather Statement	FFC	Heard	31 min
Mar 3, 1:52 AM EST	Special Weather Statement	FFC	DeKalb, Fulton	23 min
Mar 3, 1:58 AM EST	Tornado Warning	FFC	Barrow, Gwinnett, Walton	34 min
Mar 3, 2:02 AM EST	Special Weather Statement	FFC	Douglas	28 min
Mar 3, 2:10 AM EST	Special Weather Statement	FFC	Coweta	20 min
Mar 3, 2:25 AM EST	Special Weather Statement	FFC	Coweta, Fayette, Meriwether, Troup	50 min
Mar 3, 2:26 AM EST	Special Weather Statement	FFC	Clarke	34 min
Mar 3, 2:34 AM EST	Special Weather Statement	FFC	Clayton	41 min
Mar 3, 2:48 AM EST	Special Weather Statement	FFC	Henry, Newton, Rockdale, Spalding	27 min
Mar 3, 3:10 AM EST	Special Weather Statement	FFC	Butts, Henry, Jasper, Morgan, Newton, Oconee	35 min
Mar 3, 3:31 AM EST	Special Weather Statement	FFC	Oglethorpe	14 min
Mar 3, 3:41 AM EST	Special Weather Statement	FFC	Greene, Oglethorpe, Taliaferro, Wilkes	34 min
Mar 3, 3:47 AM EST	Flash Flood Warning	FFC	DeKalb	6 hr
Mar 3, 5:13 AM EST	River Flood Warning	FFC	Forsyth	12 hr
Mar 3, 5:47 AM EST	River Flood Warning	FFC	Forsyth, Fulton	36 hr
Mar 3, 6:44 AM EST	Special Weather Statement	FFC	Muscogee	31 min
Mar 3, 7:12 AM EST	Special Weather Statement	FFC	Chattahoochee	33 min
Mar 3, 7:42 AM EST	Special Weather Statement	FFC	Bibb, Chattahoochee, Crawford, Macon, Marion, Peach and 4 more	33 min
Mar 3, 8:14 AM EST	Special Weather Statement	FFC	Wheeler	31 min
Mar 3, 8:36 AM EST	Special Weather Statement	FFC	Houston, Twiggs	24 min
Mar 3, 9:01 AM EST	Special Weather Statement	FFC	Houston, Johnson, Twiggs, Wilkinson	29 min
Mar 3, 9:30 AM EST	Special Weather Statement	FFC	Bleckley, Dodge, Emanuel, Johnson, Laurens, Pulaski and 1 more	30 min
Mar 3, 9:57 AM EST	Special Weather Statement	FFC	Dodge, Emanuel, Johnson, Laurens, Treutlen	48 min
Mar 3, 10:19 AM EST	River Flood Warning	FFC	Carroll, Coweta, Heard	16 hr
Mar 3, 2:40 PM EST	Freeze Warning	FFC	Dawson, Fannin, Gilmer, Lumpkin, Pickens, Towns and 2 more	18 hr

Nearby

Flash Flood Warnings in Georgia, 2012 Every flash flood warning in 2012

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.