Alert archive / Georgia / Flash Flood Warnings in 2021
Flash Flood Warning 31, NWS Atlanta, GA
NWS Atlanta, GA issued this flash flood warning at Sep 7, 2021, 11:47 PM EDT for 4 counties in Georgia. It was in force for 9 hr. 9 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
- Sep 7, 2021, 11:47 PM EDT (03:47 UTC)
- Expired
- Sep 8, 2021, 9:00 AM EDT
- In force
- 9 hr
- Issued by
- NWS Atlanta, GA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Cobb County, GA, Forsyth County, GA, Fulton County, GA, Gwinnett County, GA
The radar
The Atlanta radar (KFFC), 76 km from the middle of the area, began a volume at 03:48 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 7, 11:58 PM EDT | FLASH FLOOD | 2 S Alpharetta, GA | WATER COVERING ROADWAY WITH A STALLED VEHICLE AT ENCORE PARKWAY AT NORTH POINT CENTER EAST. |
| Sep 8, 12:08 AM EDT | FLASH FLOOD | 1 Sse Alpharetta, GA | WATER COVERING THE ROAD WITH STALLED VEHICLE AT HAYNES BRIDGE ROAD AND WESTSIDE PARKWAY. |
| Sep 8, 12:30 AM EDT | FLASH FLOOD | 2 Ene White Water Park, GA | PORTION OF EAST LAKE PARKWAY WASHED AWAY ABOVE DRAINAGE PIPE LEAVING SEVERAL FOOT WIDE AND DEEP HOLE. |
| Sep 8, 2:00 AM EDT | FLASH FLOOD | 1 Nnw White Water Park, GA | FLASH FLOODING ALONG SOPE CREEK HAS LEAD TO A COMPLETE COLLAPSE OF PICKENS INDUSTRIAL DR OVER THE CREEK. |
| Sep 8, 2:00 AM EDT | FLASH FLOOD | 1 Sw Marietta, GA | FLASH FLOODING OF SMALL CREEK BEHIND HOME DESTROYED A SMALL FOOT BRIDGE WELL ABOVE NORMAL DRAINAGE BASIN USED BY THE HOMEOWNERS NEAR THE INTERSECTION OF CHINQUAPIN DR AND S WOODLAND DR SW. |
| Sep 8, 4:00 AM EDT | FLASH FLOOD | 2 Ene Dobbins Air Reser, GA | NUMEROUS CARS FLOODED IN THE PARKING LOT OF THE MARIETTA CROSSING APARTMENT HOMES, LIKELY DUE TO FLASH FLOODING OF NEARBY CREEK. |
| Sep 8, 4:00 AM EDT | FLASH FLOOD | 3 W Sandy Springs, GA | FLASH FLOODING ALL ALONG COLUMNS DR. SE, ESPECIALLY NOTED WHERE THE CHATTAHOOCHEE AND SOPE CREEK MEET. WATER IN THE ROADWAY, SEVERAL STALLED VEHICLES, AND WATER REPORTED UP TO SEVERAL INCHES DEEP IN SOME BASEMENTS. |
| Sep 8, 6:00 AM EDT | FLOOD | 1 Sw Roswell, GA | RIVER FLOODING IS COVERING THE INTERSECTION OF WILLEO RD AND AZALEA DR, MAKING IT IMPASSIBLE FOR VEHICLE TRAFFIC. |
| Sep 8, 6:00 AM EDT | FLOOD | 2 Ese Roswell, GA | FLOODING OVER THE ROADWAY OF RIVERSIDE RD ALONG THE CHATTAHOOCHEE RIVER. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 3.8 hours before the alert went out and 73 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
- 2587 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 936 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
892
WGUS52 KFFC 080347
FFWFFC
GAC067-117-121-135-081000-
/O.NEW.KFFC.FF.W.0031.210908T0347Z-210908T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
1147 PM EDT Tue Sep 7 2021
The National Weather Service in Peachtree City has issued a
* Flash Flood Warning for...
Northeastern Cobb County in north central Georgia...
Southwestern Forsyth County in north central Georgia...
Northeastern Fulton County in north central Georgia...
Northwestern Gwinnett County in north central Georgia...
* Until 600 AM EDT Wednesday.
* At 1147 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Marietta, Sandy Springs, Roswell, Johns Creek, Alpharetta, Smyrna,
Dunwoody, Duluth, Sugar Hill, Suwanee, Buford, Berkeley Lake, Fair
Oaks, Mountain Park, Mount Bethel, Brookwood, Sandy Plains, White
Water Park, Dobbins Air Reserve Base and Buford Dam-Lake Lanier
Parks.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3390 8459 3394 8461 3400 8454 3409 8439
3410 8424 3416 8410 3415 8401 3409 8401
3402 8405 3397 8416 3396 8427 3397 8434
3388 8448
FLASH FLOOD...RADAR INDICATED
$$2 follow-up statements
824
WGUS52 KFFC 080616
FFWFFC
GAC067-117-121-135-081300-
/O.EXT.KFFC.FF.W.0031.000000T0000Z-210908T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
216 AM EDT Wed Sep 8 2021
The National Weather Service in Peachtree City has extended the
* Flash Flood Warning for...
Northeastern Cobb County in north central Georgia...
Southwestern Forsyth County in north central Georgia...
Northeastern Fulton County in north central Georgia...
Northwestern Gwinnett County in north central Georgia...
* Until 900 AM EDT Wednesday.
* At 216 AM EDT, local law enforcement reported numerous impassable
roadways and some flooding of residences from previous heavy rain
across the warned area. Between 3 and 5 inches of rain have
fallen. Flash flooding is already occurring.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Law enforcement reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Marietta, Sandy Springs, Roswell, Johns Creek, Alpharetta, Smyrna,
Dunwoody, Duluth, Sugar Hill, Suwanee, Buford, Berkeley Lake, Fair
Oaks, Mountain Park, Mount Bethel, Brookwood, Sandy Plains, White
Water Park, Dobbins Air Reserve Base and Buford Dam-Lake Lanier
Parks.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3390 8459 3394 8461 3400 8454 3409 8439
3410 8424 3416 8410 3415 8401 3409 8401
3402 8405 3397 8416 3396 8427 3397 8434
3388 8448
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$371
WGUS72 KFFC 081258
FFSFFC
Flash Flood Statement
National Weather Service Peachtree City GA
858 AM EDT Wed Sep 8 2021
GAC067-117-121-135-081308-
/O.EXP.KFFC.FF.W.0031.000000T0000Z-210908T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cobb GA-Forsyth GA-Fulton GA-Gwinnett GA-
858 AM EDT Wed Sep 8 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 9 AM EDT THIS MORNING FOR
NORTHEASTERN COBB, SOUTHWESTERN FORSYTH, NORTHEASTERN FULTON AND
NORTHWESTERN GWINNETT COUNTIES...
The threat for flash flooding has ended, but there continues to be a
response in creeks, streams, and rivers. Be sure to heed all road
closures, and do not drive through flooded roadways.
LAT...LON 3390 8459 3394 8461 3400 8454 3409 8439
3410 8424 3416 8410 3415 8401 3409 8401
3402 8405 3397 8416 3396 8427 3397 8434
3388 8448
$$The office that day
Everything else NWS Atlanta, GA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 8:20 PM EDT | Special Weather Statement | FFC | Coweta, Heard | 25 min |
| Sep 7, 8:34 PM EDT | Special Weather Statement | FFC | Troup | 26 min |
| Sep 7, 8:36 PM EDT | Special Weather Statement | FFC | Polk | 39 min |
| Sep 7, 9:11 PM EDT | Flash Flood Warning | FFC | Haralson, Polk | 6 hr |
| Sep 7, 9:23 PM EDT | Special Weather Statement | FFC | Meriwether, Pike | 52 min |
| Sep 7, 10:02 PM EDT | Special Weather Statement | FFC | Coweta, Fayette | 43 min |
| Sep 7, 10:38 PM EDT | Special Weather Statement | FFC | Forsyth | 52 min |
| Sep 7, 10:49 PM EDT | Special Weather Statement | FFC | Clayton, Fayette | 41 min |
| Sep 7, 11:06 PM EDT | Severe Thunderstorm Warning | FFC | Clayton, Cobb, Douglas, Fulton | 24 min |
| Sep 7, 11:34 PM EDT | Severe Thunderstorm Warning | FFC | Cobb, DeKalb, Fulton | 26 min |
| Sep 8, 12:04 AM EDT | Special Weather Statement | FFC | Gwinnett | 26 min |
| Sep 8, 12:37 AM EDT | Special Weather Statement | FFC | Forsyth | 23 min |
| Sep 8, 12:55 AM EDT | River Flood Warning | FFC | Forsyth, Fulton | 38 hr |
| Sep 8, 1:01 AM EDT | River Flood Warning | FFC | Cobb | 7 hr |
| Sep 8, 1:08 AM EDT | River Flood Warning | FFC | Cobb | 4 hr |
| Sep 8, 1:13 AM EDT | River Flood Warning | FFC | Fulton, Gwinnett | 4 hr |
| Sep 8, 1:24 AM EDT | River Flood Warning | FFC | Forsyth | 4 hr |
| Sep 8, 1:46 AM EDT | River Flood Warning | FFC | Cobb | 4 hr |
| Sep 8, 1:51 AM EDT | River Flood Warning | FFC | Fulton | 7 hr |
| Sep 8, 5:31 AM EDT | River Flood Warning | FFC | Cobb, Fulton | 8 hr |
| Sep 8, 5:33 AM EDT | River Flood Warning | FFC | Cobb, Fulton | 10 hr |
| Sep 8, 5:38 AM EDT | River Flood Warning | FFC | Cobb, Fulton | 5 hr |
| Sep 8, 1:04 PM EDT | Special Weather Statement | FFC | Warren | 26 min |
| Sep 8, 1:30 PM EDT | Special Weather Statement | FFC | Warren | 30 min |
| Sep 8, 2:03 PM EDT | Special Weather Statement | FFC | Taliaferro | 27 min |
| Sep 8, 2:17 PM EDT | Special Weather Statement | FFC | Whitfield | 28 min |
| Sep 8, 2:47 PM EDT | Special Weather Statement | FFC | Hancock, Jasper, Putnam, Taliaferro, Warren | 43 min |
| Sep 8, 3:22 PM EDT | Special Weather Statement | FFC | Lamar, Meriwether, Pike, Spalding, Upson | 38 min |
| Sep 8, 3:56 PM EDT | Special Weather Statement | FFC | Lamar, Meriwether, Pike | 49 min |
| Sep 8, 4:15 PM EDT | Special Weather Statement | FFC | Baldwin, Hancock, Jones | 45 min |
| Sep 8, 4:25 PM EDT | Special Weather Statement | FFC | Chattooga | 50 min |
| Sep 8, 5:10 PM EDT | Special Weather Statement | FFC | Carroll | 50 min |
| Sep 8, 5:13 PM EDT | Special Weather Statement | FFC | Union | 47 min |
| Sep 8, 5:17 PM EDT | Special Weather Statement | FFC | Barrow, Clarke, Gwinnett, Jackson, Madison | 43 min |
| Sep 8, 5:28 PM EDT | Special Weather Statement | FFC | Jefferson, Washington | 47 min |
| Sep 8, 5:32 PM EDT | Special Weather Statement | FFC | Floyd | 43 min |
| Sep 8, 6:05 PM EDT | Special Weather Statement | FFC | Barrow, Forsyth, Jackson | 55 min |
| Sep 8, 6:08 PM EDT | Special Weather Statement | FFC | Gilmer, Pickens | 52 min |
| Sep 8, 6:16 PM EDT | Flash Flood Warning | FFC | Barrow, Forsyth, Fulton, Gwinnett, Hall, Jackson | 6 hr |
| Sep 8, 6:57 PM EDT | Special Weather Statement | FFC | Dawson, Lumpkin, Pickens | 48 min |
| Sep 8, 7:23 PM EDT | River Flood Warning | FFC | Forsyth | 117 min |
| Sep 8, 7:44 PM EDT | Special Weather Statement | FFC | Cherokee, Dawson, Forsyth, Lumpkin | 46 min |
Nearby
Flash Flood Warnings in Georgia, 2021Every flash flood warning in 2021
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.