Alert archive / Georgia / Flash Flood Warnings in 2012

Flash Flood Warning 8, NWS Atlanta, GA

March 3, 2012DeKalb County, Georgia

NWS Atlanta, GA issued this flash flood warning at Mar 3, 2012, 3:47 AM EST for DeKalb 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, 3:47 AM EST (08:47 UTC)
Expired: Mar 3, 2012, 9:45 AM EST
In force: 6 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

County DeKalb County, GA

The radar

The Atlanta radar (KFFC), 54 km from the middle of the area, began a volume at 08:48 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, 8.8 hours before the alert went out and 50 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.

353 
WGUS52 KFFC 030847
FFWFFC
GAC089-031445-
/O.NEW.KFFC.FF.W.0008.120303T0847Z-120303T1445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DEKALB COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 945 AM EST

* AT 338 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  OCCASIONAL HEAVY RAIN HAS CAUSED 2 TO 3 INCHES OF RAIN AND POSSIBLE
  FLASH FLOODING ON THE NORTH FORK PEACHTREE CREEK AND SNAPFINGER    
  CREEK. OTHER CREEKS IN THE WARNED AREA MAY ALSO HAVE FLASH         
  FLOODING.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PINE
  LAKE...STONE MOUNTAIN...CLARKSTON...TUCKER AND DRUID HILLS.

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 3388 8421 3386 8416 3377 8407 3375 8402
      3372 8406 3361 8412 3365 8418 3365 8422
      3363 8424 3365 8424 3365 8435 3386 8435

$$

16

2 follow-up statements

397 
WGUS72 KFFC 031115
FFSFFC

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

GAC089-031445-
/O.CON.KFFC.FF.W.0008.000000T0000Z-120303T1445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DEKALB GA-
615 AM EST SAT MAR 3 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 AM EST FOR
DEKALB COUNTY...

AT 605 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 DEKALB COUNTY TO REACH BANKFULL CONDITIONS. THE NORTH 
AND SOUTH FORK PEACHTREE CREEKS...SNAPFINGER CREEK AND SHOAL CREEK 
HAVE BEEN WITHIN ONE HALF FOOT OF FLOOD STAGE. THE CREEKS HAVE 
LEVELED OFF OR ARE SLOWLY BEGINNING TO FALL. HOWEVER...ADDITIONAL 
RAINFALL AMOUNTS OF ONE HALF TO ONE INCH THROUGH 900 AM EST MAY 
CAUSE THE CREEKS TO RISE AGAIN AND REACH FLOOD STAGE. THE FLASH 
FLOOD WARNING WILL CONTINUE.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PINE LAKE...
AVONDALE ESTATES...DECATUR...STONE MOUNTAIN...CLARKSTON...TUCKER AND 
DRUID HILLS.

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 3388 8421 3386 8416 3377 8407 3375 8402
      3372 8406 3361 8412 3365 8418 3365 8422
      3363 8424 3365 8424 3365 8435 3386 8435

$$

16

328 
WGUS72 KFFC 031438
FFSFFC

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

GAC089-031445-
/O.EXP.KFFC.FF.W.0008.000000T0000Z-120303T1445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DEKALB GA-
938 AM EST SAT MAR 3 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 945 AM EST FOR DEKALB
COUNTY...

THE MODERATE TO HEAVY RAIN HAS MOVED OUT OF THE AREA AND THE FLASH 
FLOOD THREAT HAS ENDED. HOWEVER...CREEKS AND RIVERS IN DEKALB 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 3388 8421 3386 8416 3377 8407 3375 8402
      3372 8406 3361 8412 3365 8418 3365 8422
      3363 8424 3365 8424 3365 8435 3386 8435

$$

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, 4:11 AM EST	Flash Flood Warning	FFC	Gwinnett	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.