Alert archive / Georgia / Flash Flood Warnings in 2017
Flash Flood Warning 45, NWS Atlanta, GA
NWS Atlanta, GA issued this flash flood warning at Aug 14, 2017, 9:37 PM EDT for Gwinnett County, Georgia. It was in force for 4 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
- Aug 14, 2017, 9:37 PM EDT (01:37 UTC)
- Expired
- Aug 15, 2017, 1:30 AM EDT
- In force
- 4 hr
- Issued by
- NWS Atlanta, GA
- Area
- Storm-based polygon
- Flood severity
- None
County Gwinnett County, GA
The radar
The Atlanta radar (KFFC), 84 km from the middle of the area, began a volume at 01:40 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, 1.6 hours before the alert went out and 80 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
- 314 J/kg
- Mixed-layer CIN
- -71 J/kg
- Mixed-layer LCL
- 1290 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
158
WGUS52 KFFC 150137
FFWFFC
GAC135-150530-
/O.NEW.KFFC.FF.W.0045.170815T0137Z-170815T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
937 PM EDT MON AUG 14 2017
The National Weather Service in Peachtree City has issued a
* Flash Flood Warning for...
Central Gwinnett County in north central Georgia...
* Until 130 AM EDT
* At 937 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to three inches of rain have
already fallen. Flash flooding is expected to begin shortly.
* Some locations that will experience flooding include...
Lawrenceville, Duluth, Snellville, Suwanee, Lilburn, Dacula,
Grayson, Mountain Park, Harbin and Hog Mountain.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
If you see significant flooding call the National Weather Service
toll free at 1 8 6 6 7 6 3 4 4 6 6 or tweet us your report at
NWSATLANTA.
&&
LAT...LON 3405 8389 3396 8385 3387 8389 3382 8401
3384 8413 3395 8418 3402 8414 3407 8402
$$1 follow-up statement
112
WGUS72 KFFC 150529
FFSFFC
Flash Flood Statement
National Weather Service Peachtree City GA
129 AM EDT TUE AUG 15 2017
GAC135-150535-
/O.EXP.KFFC.FF.W.0045.000000T0000Z-170815T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gwinnett GA-
129 AM EDT TUE AUG 15 2017
...THE FLASH FLOOD WARNING FOR CENTRAL GWINNETT COUNTY WILL EXPIRE AT
130 AM EDT...
The heavy rain has ended. River stages along Shoal Creek and Alcovy
River have slowed with the levels below minor flood stage.
Anticipate the run-off, from the heavy rainfall earlier this
evening, to continue to subside with no other impacts expected.
Please continue to heed any remaining road closures.
LAT...LON 3405 8389 3396 8385 3387 8389 3382 8401
3384 8413 3395 8418 3402 8414 3407 8402
$$The office that day
Everything else NWS Atlanta, GA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 8:12 PM EDT | Special Weather Statement | FFC | Emanuel | 33 min |
| Aug 14, 8:23 PM EDT | Special Weather Statement | FFC | Hall | 37 min |
| Aug 14, 8:29 PM EDT | Special Weather Statement | FFC | Gwinnett | 31 min |
| Aug 14, 9:04 PM EDT | Special Weather Statement | FFC | Barrow, Walton | 26 min |
| Aug 14, 10:16 PM EDT | Special Weather Statement | FFC | Madison | 44 min |
| Aug 15, 4:09 PM EDT | Special Weather Statement | FFC | Lamar, Pike | 36 min |
| Aug 15, 4:17 PM EDT | Special Weather Statement | FFC | Jones | 28 min |
| Aug 15, 4:43 PM EDT | Special Weather Statement | FFC | Baldwin, Jones | 32 min |
| Aug 15, 5:15 PM EDT | Special Weather Statement | FFC | Wilkinson | 30 min |
| Aug 15, 6:33 PM EDT | Special Weather Statement | FFC | Bibb | 27 min |
| Aug 15, 6:46 PM EDT | Special Weather Statement | FFC | Harris | 29 min |
| Aug 15, 6:52 PM EDT | Special Weather Statement | FFC | Houston | 23 min |
| Aug 15, 7:28 PM EDT | Special Weather Statement | FFC | Harris | 32 min |
Nearby
Flash Flood Warnings in Georgia, 2017Every flash flood warning in 2017
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.