Alert archive / Georgia / Flash Flood Warnings in 2013

Flash Flood Warning 92, NWS Atlanta, GA

August 21, 2013DeKalb County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 21, 2013, 11:51 AM EDT for DeKalb County, 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
Aug 21, 2013, 11:51 AM EDT (15:51 UTC)
Expired
Aug 21, 2013, 5:45 PM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

County DeKalb County, GA

The radar

The Atlanta radar (KFFC), 63 km from the middle of the area, began a volume at 15:53 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

TimeReportWhereRemark
Aug 21, 12:35 PM EDTFLASH FLOOD2 Nne Stone Mountain, GATHE STAGE HEIGHT AT A USGS STREAM GAGE ON STONE MOUNTAIN CREEK AT SILVER HILL ROAD REACHED FLOOD STAGE OF 9 FEET. THE CREEK CREST AT 9.1 FEET. MINOR FLOODING OCCURRED IN THE WOODLANDS AND RESIDENTIAL YARDS ALONG THE CREEK.
Aug 21, 12:35 PM EDTFLASH FLOOD2 Sse Tucker, GAA PORTION OF SNAPFINGER CREEK CAME OUT OF ITS BANKS AND FLOODED A HOME OFF ROWLAND ROAD WITH AROUND ONE INCH OF WATER. THE SOUTH FORK PEACHTREE CREEK FLOODED PORTIONS OF MEDLOCK PARK AND ATHLETIC FIELDS WITH UP TO 3 FEET OF WATER. THREE HOMES ON SCOTT CIRCLE N

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, 3.9 hours before the alert went out and 59 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 2013-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 873 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 2013-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 116 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
873 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
589 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
116 m²/s²
0-3 km storm-relative helicity
118 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.

556 
WGUS52 KFFC 211551
FFWFFC
GAC089-212145-
/O.NEW.KFFC.FF.W.0092.130821T1551Z-130821T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1151 AM EDT WED AUG 21 2013

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL DEKALB COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 545 PM EDT

* AT 1141 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR 
  INDICATED 2 TO 3 INCHES OF RAIN HAS FALLEN IN THE LAST 2 HOURS 
  OVER PARTS OF EASTCENTRAL DEKALB COUNTY. RIVER GAGE LEVELS
  ON SNAPFINGER CREEK AND STONE MOUNTAIN CREEK ARE RISING 
  RAPIDLY AND WILL BE COMING OUT OF THEIR BANKS BY MIDDAY. 
  EVEN AFTER THE RAIN ENDS...WATER LEVELS WILL CONTINUE TO RISE
  AND WILL PROLONG THE FLOOD THROUGH AT LEAST MID AFTERNOON.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  TUCKER AND CLARKSTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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. NEVER DRIVE INTO 
WATER COVERING OR RUNNING OVER A ROAD. THE MAJORITY OF FLOODING
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. YOU CAN ALSO TWEET YOUR REPORT
USING HASHTAG GAWX.

&&

LAT...LON 3386 8423 3387 8419 3386 8416 3383 8413
      3382 8413 3376 8420 3381 8428

$$
1 follow-up statement
969 
WGUS72 KFFC 211900
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
300 PM EDT WED AUG 21 2013

GAC089-211909-
/O.CAN.KFFC.FF.W.0092.000000T0000Z-130821T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DEKALB GA-
300 PM EDT WED AUG 21 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL DEKALB
COUNTY...

WATER LEVELS HAVE RECEDED ON AFFECTED CREEKS AND STREAMS. ALTHOUGH 
LARGER CREEKS AND RIVERS WILL REMAIN AT HIGH LEVELS...FLOODING OR
FLASH FLOODING IS NO LONGER EXPECTED.

IF YOU SAW SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6. YOU CAN ALSO TWEET YOUR REPORT
USING HASHTAG GAWX.

LAT...LON 3386 8423 3387 8419 3386 8417 3383 8413
      3382 8413 3376 8420 3381 8428

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 8:13 PM EDTSpecial Weather StatementFFCChattahoochee, Macon, Marion, Muscogee, Schley, Talbot and 1 more47 min
Aug 20, 8:24 PM EDTSpecial Weather StatementFFCCrisp36 min
Aug 20, 8:39 PM EDTSevere Thunderstorm WarningFFCCrisp, Wilcox51 min
Aug 20, 8:55 PM EDTSevere Thunderstorm WarningFFCDooly, Pulaski, Wilcox50 min
Aug 20, 9:00 PM EDTSpecial Weather StatementFFCMacon, Talbot, Taylor30 min
Aug 20, 9:33 PM EDTFlash Flood WarningFFCCrisp, Dooly, Wilcox6 hr
Aug 20, 9:52 PM EDTSpecial Weather StatementFFCCrawford, Houston, Peach, Upson53 min
Aug 20, 11:03 PM EDTSpecial Weather StatementFFCDodge42 min
Aug 20, 11:37 PM EDTSpecial Weather StatementFFCLaurens, Wheeler38 min
Aug 20, 11:51 PM EDTSpecial Weather StatementFFCNewton, Rockdale24 min
Aug 21, 12:20 AM EDTSpecial Weather StatementFFCLaurens40 min
Aug 21, 4:07 AM EDTFlash Flood WatchFFCBaldwin, Bibb, Bleckley, Chattahoochee, Crawford, Crisp and 29 more17 hr
Aug 21, 9:26 AM EDTSpecial Weather StatementFFCRockdale64 min
Aug 21, 10:06 AM EDTSpecial Weather StatementFFCRockdale54 min
Aug 21, 11:17 AM EDTSpecial Weather StatementFFCDeKalb58 min
Aug 21, 12:10 PM EDTFlash Flood WarningFFCWhite6 hr
Aug 21, 1:24 PM EDTSpecial Weather StatementFFCPolk36 min
Aug 21, 3:47 PM EDTSpecial Weather StatementFFCTelfair, Wheeler28 min
Aug 21, 4:42 PM EDTSpecial Weather StatementFFCChattooga, Dade, Walker33 min
Aug 21, 4:57 PM EDTSevere Thunderstorm WarningFFCOglethorpe, Wilkes48 min
Aug 21, 5:58 PM EDTSpecial Weather StatementFFCPolk32 min
Aug 21, 6:22 PM EDTSpecial Weather StatementFFCHaralson38 min
Aug 21, 6:58 PM EDTSpecial Weather StatementFFCMonroe32 min

Nearby

Flash Flood Warnings in Georgia, 2013Every flash flood warning in 2013

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.