Alert archive / Georgia / Flash Flood Warnings in 2009

Flash Flood Warning 7, NWS Atlanta, GA

July 8, 2009Union County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jul 8, 2009, 7:06 PM EDT for Union County, Georgia. It was in force for 3 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: Jul 8, 2009, 7:06 PM EDT (23:06 UTC)
Expired: Jul 8, 2009, 10:00 PM EDT
In force: 3 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

County Union County, GA

The radar

The Knoxville radar (KMRX), 147 km from the middle of the area, began a volume at 23:07 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
Jul 8, 7:30 PM EDT	FLASH FLOOD	4 N Blairsville, GA	MINOR FLOODING OF LOW-LYING AREAS AS IVYLOG CREEK SPILLED OUT OF ITS BANKS. NO STRUCTURES AFFECTED.
Jul 8, 7:30 PM EDT	FLASH FLOOD	5 Nw Blairsville, GA	MINOR FLOODING OF LOW-LYING AREAS AND AGRICULTURAL FIELDS AS IVYLOG CREEK SPILLED OUT OF ITS BANKS. NO STRUCTURES AFFECTED.

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, 11.1 hours before the alert went out and 180 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: 1388 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 684 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 42 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.

000 
WGUS52 KFFC 082306 CCA
FFWFFC
GAC291-090200-
/O.NEW.KFFC.FF.W.0007.090708T2306Z-090709T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
706 PM EDT WED JUL 8 2009

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

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

* UNTIL 1000 PM EDT

* AT 656 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  POSSIBLE FLASH FLOODING FROM THUNDERSTORMS OVER THE WARNED AREA.

* THE STORMS PRODUCING POSSIBLE FLASH FLOODING WILL OTHERWISE REMAIN 
  OVER MAINLY RURAL AREAS OF UNION COUNTY BETWEEN IVYLOG...
  BLAIRSVILLE AND GUMLOG MOUNTAIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS...STREAMS AND COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE 
BANKS OF CREEKS AND STREAMS. SOME CREEKS THAT WILL BE AFFECTED ARE
MOCCASIN...IVYLOG...GUMLOG AND BUTTERNUT.

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.

&&

LAT...LON 3496 8394 3491 8390 3491 8388 3489 8385
      3484 8385 3484 8403 3498 8404 3498 8394

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 7:47 AM EDT	Flash Flood Warning	FFC	Towns, Union, White	6 hr
Jul 8, 10:25 AM EDT	Flash Flood Warning	FFC	Lumpkin, Union	12 hr
Jul 8, 3:56 PM EDT	Severe Thunderstorm Warning	FFC	Houston, Twiggs	49 min
Jul 8, 4:31 PM EDT	Severe Thunderstorm Warning	FFC	Fannin, Gilmer	18 min
Jul 8, 4:45 PM EDT	Severe Thunderstorm Warning	FFC	Bleckley, Twiggs	18 min

Nearby

Flash Flood Warnings in Georgia, 2009 Every flash flood warning in 2009

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.