Alert archive / Georgia / Flash Flood Warnings in 2020
Flash Flood Warning 67, NWS Atlanta, GA
NWS Atlanta, GA issued this flash flood warning at Oct 24, 2020, 7:32 PM EDT for 5 counties in Georgia. It was in force for 6 hr. 2 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
- Oct 24, 2020, 7:32 PM EDT (23:32 UTC)
- Expired
- Oct 25, 2020, 1:30 AM EDT
- In force
- 6 hr
- Issued by
- NWS Atlanta, GA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Clayton County, GA, Cobb County, GA, DeKalb County, GA, Fulton County, GA, Gwinnett County, GA
The radar
The Atlanta radar (KFFC), 59 km from the middle of the area, began a volume at 23:30 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 |
|---|---|---|---|
| Oct 24, 7:55 PM EDT | FLASH FLOOD | 2 Ssw Bankhead, GA | WATER RESCUE OF 2 VECHICLES ON VERBENA ST. |
| Oct 24, 7:55 PM EDT | FLASH FLOOD | 3 Nw Cascade Heights, GA | WATER REPORTED INSIDE 3 BUILDINGS. |
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 12:00Z, 11.5 hours before the alert went out and 57 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
- 214 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 780 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
068
WGUS52 KFFC 242332
FFWFFC
GAC063-067-089-121-135-250530-
/O.NEW.KFFC.FF.W.0067.201024T2332Z-201025T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
732 PM EDT Sat Oct 24 2020
The National Weather Service in Peachtree City has issued a
* Flash Flood Warning for...
Northwestern Clayton County in north central Georgia...
Eastern Cobb County in north central Georgia...
DeKalb County in north central Georgia...
Central Fulton County in north central Georgia...
Southwestern Gwinnett County in north central Georgia...
* Until 130 AM EDT.
* At 732 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. Flash flooding is already occurring.
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...
Atlanta, Marietta, Decatur, Sandy Springs, Roswell, Johns Creek,
Alpharetta, Smyrna, Dunwoody, East Point, Duluth, Forest Park,
College Park, Lilburn, Chamblee, Norcross, Doraville, Clarkston,
Hapeville and Stone Mountain.
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.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses
as well as other drainage areas and low lying spots.
&&
LAT...LON 3379 8459 3407 8442 3407 8416 3404 8412
3365 8415 3364 8445
FLASH FLOOD...RADAR INDICATED
$$1 follow-up statement
891
WGUS72 KFFC 250005
FFSFFC
Flash Flood Statement
National Weather Service Peachtree City GA
805 PM EDT Sat Oct 24 2020
GAC063-067-089-121-135-250530-
/O.CON.KFFC.FF.W.0067.000000T0000Z-201025T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clayton GA-Cobb GA-DeKalb GA-Fulton GA-Gwinnett GA-
805 PM EDT Sat Oct 24 2020
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 AM EDT SUNDAY FOR
NORTHWESTERN CLAYTON, EASTERN COBB, DEKALB, CENTRAL FULTON AND
SOUTHWESTERN GWINNETT COUNTIES...
At 805 PM EDT, emergency management reported thunderstorms producing
heavy rain across the warned area. Between 1 and 3.5 inches of rain
have fallen. Flash flooding is already occurring. Emergency
management has reported water rescues and flooded roadways within
the warned area.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Emergency management.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Atlanta, Marietta, Decatur, Sandy Springs, Roswell, Johns Creek,
Alpharetta, Smyrna, Dunwoody, East Point, Duluth, Forest Park,
College Park, Lilburn, Chamblee, Norcross, Doraville, Clarkston,
Hapeville and Stone Mountain.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses
as well as other drainage areas and low lying spots.
&&
LAT...LON 3379 8459 3407 8442 3407 8416 3404 8412
3365 8415 3364 8445
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$The office that day
Everything else NWS Atlanta, GA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 24, 4:45 PM EDT | Special Weather Statement | FFC | Chattahoochee, Harris, Marion, Muscogee, Stewart, Talbot and 1 more | 30 min |
| Oct 24, 6:23 PM EDT | Special Weather Statement | FFC | Banks, Jackson | 22 min |
| Oct 24, 6:28 PM EDT | Special Weather Statement | FFC | Clayton, Cobb, DeKalb, Fulton | 32 min |
| Oct 24, 6:53 PM EDT | Special Weather Statement | FFC | Banks | 37 min |
| Oct 24, 7:22 PM EDT | River Flood Warning | FFC | DeKalb | 4 hr |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.