Alert archive / Georgia / Flash Flood Warnings in 2020
Flash Flood Warning 34, NWS Atlanta, GA
NWS Atlanta, GA issued this flash flood warning at Aug 13, 2020, 8:59 PM EDT for Oconee County, Walton County, Georgia. It was in force for 2 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 13, 2020, 8:59 PM EDT (00:59 UTC)
- Expired
- Aug 13, 2020, 11:00 PM EDT
- In force
- 2 hr
- Issued by
- NWS Atlanta, GA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Oconee County, GA, Walton County, GA
The radar
The Atlanta radar (KFFC), 110 km from the middle of the area, began a volume at 01:02 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, 1.0 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.
- Mixed-layer CAPE
- 1129 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1535 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
364
WGUS52 KFFC 140059
FFWFFC
GAC219-297-140700-
/O.NEW.KFFC.FF.W.0034.200814T0059Z-200814T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
859 PM EDT Thu Aug 13 2020
The National Weather Service in Peachtree City has issued a
* Flash Flood Warning for...
Northeastern Walton County in north central Georgia...
Northwestern Oconee County in northeastern Georgia...
* Until 300 AM EDT Friday.
* At 859 PM EDT, Radar rainfall estimates between 1 and 3 inches of
rain have fallen and thunderstorms are still occurring. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flash flooding include...
Bogart and Eastville.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3390 8359 3391 8359 3393 8357 3394 8352
3393 8351 3393 8349 3392 8347 3389 8344
3386 8348 3383 8357 3382 8364 3384 8368
3387 8365
FLASH FLOOD...RADAR INDICATED
$$2 follow-up statements
142
WGUS72 KFFC 140207
FFSFFC
Flash Flood Statement
National Weather Service Peachtree City GA
1007 PM EDT Thu Aug 13 2020
GAC219-297-140700-
/O.CON.KFFC.FF.W.0034.000000T0000Z-200814T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Oconee GA-Walton GA-
1007 PM EDT Thu Aug 13 2020
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 3 AM EDT FRIDAY FOR
NORTHEASTERN WALTON AND NORTHWESTERN OCONEE COUNTIES...
At 1007 PM EDT, Radar and gage rainfall estimates between 1 and 3
inches of rain have fallen in the warned area. The heavy rain has
tapered off however creeks and rivers will continue to rise well
after the rain has ended. Flash flooding is expected to begin or
continue.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
Some locations that will experience flash flooding include...
Bogart and Eastville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.
If you see significant flooding call the National Weather Service
toll free at 1 8 6 6 7 6 3 4 4 6 6 or tweet us your report at
NWSATLANTA.
&&
LAT...LON 3390 8359 3391 8359 3393 8357 3394 8352
3393 8351 3393 8349 3392 8347 3389 8344
3386 8348 3383 8357 3384 8368 3387 8365
FLASH FLOOD...RADAR INDICATED
$$278
WGUS72 KFFC 140300
FFSFFC
Flash Flood Statement
National Weather Service Peachtree City GA
1100 PM EDT Thu Aug 13 2020
GAC219-297-140310-
/O.CAN.KFFC.FF.W.0034.000000T0000Z-200814T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Oconee GA-Walton GA-
1100 PM EDT Thu Aug 13 2020
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN WALTON AND
NORTHWESTERN OCONEE COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose an
immediate threat to life and property.
LAT...LON 3390 8359 3391 8359 3393 8357 3394 8352
3393 8351 3393 8349 3392 8347 3389 8344
3386 8348 3383 8357 3384 8368 3387 8365
$$The office that day
Everything else NWS Atlanta, GA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 8:23 PM EDT | Special Weather Statement | FFC | Gwinnett | 22 min |
| Aug 13, 8:30 PM EDT | Special Weather Statement | FFC | Forsyth | 30 min |
| Aug 13, 8:47 PM EDT | Special Weather Statement | FFC | Barrow | 28 min |
| Aug 13, 8:51 PM EDT | Special Weather Statement | FFC | Oconee | 24 min |
| Aug 13, 9:10 PM EDT | Special Weather Statement | FFC | Wilkinson | 35 min |
| Aug 13, 9:16 PM EDT | Special Weather Statement | FFC | Fulton | 29 min |
| Aug 13, 9:31 PM EDT | Special Weather Statement | FFC | Washington | 29 min |
| Aug 13, 9:41 PM EDT | Special Weather Statement | FFC | Morgan | 34 min |
| Aug 13, 11:04 PM EDT | Special Weather Statement | FFC | Jefferson | 26 min |
| Aug 13, 11:05 PM EDT | Special Weather Statement | FFC | Pike | 25 min |
| Aug 13, 11:22 PM EDT | River Flood Warning | FFC | DeKalb | 2 hr |
| Aug 14, 3:09 PM EDT | Special Weather Statement | FFC | Twiggs | 36 min |
Nearby
Flash Flood Warnings in Georgia, 2020Every flash flood warning in 2020
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.