Alert archive / Georgia / Flash Flood Warnings in 2013

Flash Flood Warning 19, NWS Atlanta, GA

June 5, 2013DeKalb County, Fulton County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jun 5, 2013, 9:28 PM EDT for DeKalb County, Fulton County, Georgia. It was in force for 4 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: Jun 5, 2013, 9:28 PM EDT (01:28 UTC)
Expired: Jun 6, 2013, 1:30 AM EDT
In force: 4 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties DeKalb County, GA, Fulton County, GA

The radar

The Atlanta radar (KFFC), 66 km from the middle of the area, began a volume at 01:31 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
Jun 5, 9:35 PM EDT	FLASH FLOOD	2 Wnw Chamblee, GA	A USGS STREAM GAGE ON NANCY CREEK AT JOHNSON FERRY ROAD REACHED FLOOD STAGE OF 16 FEET. THE CREEK CREST AT 16.2 FEET. THIS CAUSED MINOR FLOODING IN THE WOODLANDS ALONG THE CREEK AND ON THE ATHLETIC FIELDS OF THE MARIST HIGH SCHOOL CAMPUS. FLOODING OF RESIDENTI
Jun 5, 10:00 PM EDT	FLASH FLOOD	2 S Sandy Springs, GA	A DAM BREACH OCCURRED OF A 7 ACRE POND BY ROSWELL ROAD. AN ACCESS ROAD OVER THE DAM WAS THE ONLY ENTRANCE INTO A NEIGHBORHOOD WHICH IS NOW CUTOFF. EROSION CAUSED SEVERE DAMAGE TO THE ACCESS ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 1.5 hours before the alert went out and 241 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 429 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 717 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 222 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.

936 
WGUS52 KFFC 060128
FFWFFC
GAC089-121-060530-
/O.NEW.KFFC.FF.W.0019.130606T0128Z-130606T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
928 PM EDT WED JUN 5 2013

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

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

* UNTIL 130 AM EDT

* AT 921 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 DUNWOODY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...INCLUDING NANCY CREEK...AS WELL AS HIGHWAYS AND 
UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE 
BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO 
FLOODING.

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 3398 8437 3399 8428 3388 8424 3388 8435
      3385 8440

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 5, 8:03 PM EDT	Special Weather Statement	FFC	Clayton, Fulton	42 min
Jun 5, 8:29 PM EDT	Flash Flood Warning	FFC	Clayton, DeKalb, Fulton	4 hr
Jun 5, 8:53 PM EDT	Special Weather Statement	FFC	Bleckley, Laurens	52 min
Jun 5, 9:14 PM EDT	Flash Flood Warning	FFC	Bleckley, Dodge, Laurens	6 hr
Jun 5, 9:20 PM EDT	Special Weather Statement	FFC	Fayette	25 min
Jun 5, 10:06 PM EDT	Flash Flood Warning	FFC	Coweta, Fayette	6 hr
Jun 5, 11:02 PM EDT	Special Weather Statement	FFC	Henry	58 min
Jun 6, 12:12 AM EDT	River Flood Warning	FFC	DeKalb, Fulton	3 hr
Jun 6, 12:12 AM EDT	River Flood Warning	FFC	DeKalb, Fulton	3 hr
Jun 6, 12:21 AM EDT	Special Weather Statement	FFC	Henry, Jasper, Newton	54 min
Jun 6, 12:25 AM EDT	Special Weather Statement	FFC	Crawford, Peach, Taylor	65 min
Jun 6, 4:22 AM EDT	Flood Watch	FFC	Baldwin, Bibb, Bleckley, Crawford, Crisp, Dodge and 33 more	31 hr
Jun 6, 11:46 AM EDT	Wind Advisory	FFC	Montgomery, Telfair, Toombs, Wheeler	14 hr

Nearby

Flash Flood Warnings in Georgia, 2013 Every 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.