Alert archive / Georgia / Flash Flood Warnings in 2014

Flash Flood Warning 26, NWS Atlanta, GA

August 10, 2014DeKalb County, Henry County, Rockdale County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 10, 2014, 3:53 PM EDT for DeKalb County, Henry County, Rockdale County, Georgia. It was in force for 6 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 10, 2014, 3:53 PM EDT (19:53 UTC)
Expired
Aug 10, 2014, 10:00 PM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties DeKalb County, GA, Henry County, GA, Rockdale County, GA

The radar

The Atlanta radar (KFFC), 42 km from the middle of the area, began a volume at 19:54 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, 7.9 hours before the alert went out and 38 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.

Skew-T log-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 12:00Z on 2014-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 260 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 12:00Z on 2014-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
260 J/kg
Mixed-layer CIN
-62 J/kg
Mixed-layer LCL
695 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
-4 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

278 
WGUS52 KFFC 101953
FFWFFC
GAC089-151-247-110200-
/O.NEW.KFFC.FF.W.0026.140810T1953Z-140811T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
353 PM EDT SUN AUG 10 2014

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN DEKALB COUNTY IN NORTH CENTRAL GEORGIA
  NORTH CENTRAL HENRY COUNTY IN NORTH CENTRAL GEORGIA
  SOUTHWESTERN ROCKDALE COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 1000 PM EDT

* AT 351 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CEDAR
  GROVE...SNAPFINGER AND ARABIA MOUNTAIN

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

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 3370 8431 3371 8411 3355 8408 3357 8426
      3359 8425 3359 8424 3361 8426 3363 8426
      3365 8431

$$
1 follow-up statement
454 
WGUS72 KFFC 102321
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
721 PM EDT SUN AUG 10 2014

GAC089-151-247-102330-
/O.CAN.KFFC.FF.W.0026.000000T0000Z-140811T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ROCKDALE GA-DEKALB GA-HENRY GA-
721 PM EDT SUN AUG 10 2014

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTH CENTRAL
HENRY...SOUTHERN DEKALB AND SOUTHWESTERN ROCKDALE COUNTIES...

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 3370 8431 3371 8411 3355 8408 3357 8426
      3359 8425 3359 8424 3361 8426 3363 8426
      3365 8431

$$

The office that day

Everything else NWS Atlanta, GA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 9, 8:00 PM EDTSpecial Weather StatementFFCDeKalb30 min
Aug 9, 8:20 PM EDTFlash Flood WarningFFCDeKalb, Fulton, Gwinnett6 hr
Aug 9, 8:27 PM EDTSpecial Weather StatementFFCDeKalb, Gwinnett63 min
Aug 9, 8:58 PM EDTSpecial Weather StatementFFCForsyth, Hall62 min
Aug 9, 9:49 PM EDTFlash Flood WarningFFCDawson, Forsyth, Hall, Lumpkin6 hr
Aug 9, 9:56 PM EDTSpecial Weather StatementFFCBaldwin64 min
Aug 9, 9:59 PM EDTSpecial Weather StatementFFCWhite61 min
Aug 9, 10:25 PM EDTSpecial Weather StatementFFCWashington65 min
Aug 10, 3:37 PM EDTSpecial Weather StatementFFCDeKalb, Rockdale23 min
Aug 10, 7:05 PM EDTSpecial Weather StatementFFCHouston, Peach55 min
Aug 10, 7:29 PM EDTSpecial Weather StatementFFCCrawford61 min

Nearby

Flash Flood Warnings in Georgia, 2014Every flash flood warning in 2014

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.