Alert archive / Georgia / Flash Flood Warnings in 2020
Flash Flood Warning 1, NWS Atlanta, GA
NWS Atlanta, GA issued this flash flood warning at Jan 2, 2020, 5:33 PM EST for Gwinnett 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
- Jan 2, 2020, 5:33 PM EST (22:33 UTC)
- Expired
- Jan 2, 2020, 7:35 PM EST
- In force
- 2 hr
- Issued by
- NWS Atlanta, GA
- Area
- Storm-based polygon
- Flood severity
- None
County Gwinnett County, GA
The radar
The Atlanta radar (KFFC), 76 km from the middle of the area, began a volume at 22:37 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 12:00Z, 10.6 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1590 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- 126 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
335
WGUS52 KFFC 022233
FFWFFC
GAC135-030430-
/O.NEW.KFFC.FF.W.0001.200102T2233Z-200103T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
533 PM EST Thu Jan 2 2020
The National Weather Service in Peachtree City has issued a
* Flash Flood Warning for...
West central Gwinnett County in north central Georgia...
* Until 1130 PM EST.
* At 532 PM EST, Doppler radar indicated heavy rain across the warned
area. Up to two inches of rain have already fallen. Flash flooding
is expected to begin shortly in the Crooked Creek normally prone
areas.
* Some locations that will experience flooding include...
Norcross and Berkeley Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3400 8420 3399 8420 3399 8419 3396 8418
3395 8427 3396 8428 3397 8426 3399 8426
3399 8425 3400 8424 3401 8422
$$1 follow-up statement
026
WGUS72 KFFC 030035
FFSFFC
Flash Flood Statement
National Weather Service Peachtree City GA
735 PM EST Thu Jan 2 2020
GAC135-030044-
/O.CAN.KFFC.FF.W.0001.000000T0000Z-200103T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gwinnett GA-
735 PM EST Thu Jan 2 2020
...THE FLASH FLOOD WARNING FOR WEST CENTRAL GWINNETT COUNTY IS
CANCELLED...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.
LAT...LON 3400 8420 3399 8420 3399 8419 3396 8418
3395 8427 3396 8428 3397 8426 3399 8426
3399 8425 3400 8424 3401 8422
$$The office that day
Everything else NWS Atlanta, GA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 2, 5:36 PM EST | Flash Flood Warning | FFC | Fulton, Gwinnett | 119 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.