Alert archive / Georgia / Flash Flood Warnings in 2008

Flash Flood Warning 7, NWS Atlanta, GA

July 9, 2008Dawson County, Lumpkin County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jul 9, 2008, 1:54 AM EDT for Dawson County, Lumpkin County, Georgia. It was in force for 4 hr. 1 report 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 9, 2008, 1:54 AM EDT (05:54 UTC)
Expired: Jul 9, 2008, 6:00 AM EDT
In force: 4 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties Dawson County, GA, Lumpkin County, GA

The radar

The Atlanta radar (KFFC), 132 km from the middle of the area, began a volume at 05:57 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 9, 3:00 AM EDT	FLASH FLOOD	3 Nw Mckee, GA	COCHRANS CREEK AND GAB CREEK CAME OUT OF THEIR BANKS AND CAUSED MINOR FLOODING OF AGRICULTURAL FIELDS. A LARGE GARDEN WAS FLOODED OUT IN THE 2000 BLOCK OF BAILEY WATERS ROAD.

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 00:00Z, 5.9 hours before the alert went out and 129 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: 1306 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1363 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 74 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 090601
FFWFFC
GAC085-187-091000-
/O.NEW.KFFC.FF.W.0007.080709T0554Z-080709T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
154 AM EDT WED JUL 9 2008

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DAWSON COUNTY IN NORTH CENTRAL GEORGIA
  LUMPKIN COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 600 AM EDT

* AT 154 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM THUNDERSTORMS ALONG THE BORDER OF DAWSON AND
  LUMPKIN COUNTIES. AFFECTED CREEK BASINS INCLUDE 
  POVERTY CREEK...COCHRAN CREEK...MILL CREEK...PIGEON CREEK...FLAT 
  CREEK...BURT CREEK...AND CALHOUN CREEK.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
  NIMBLEWILL...MCKEE...AURARIA AND DAWSONVILLE

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

IN HILLY TERRAIN THERE ARE LOW WATER CROSSINGS WHICH ARE POTENTIALLY
DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED
ROADS...FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW INCHES OF SWIFTLY
FLOWING WATER TO CARRY VEHICLES AWAY.

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 3456 8424 3460 8416 3444 8394 3438 8402
      3441 8417

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 8:00 PM EDT	Severe Thunderstorm Warning	FFC	Barrow, Gwinnett	29 min
Jul 8, 9:30 PM EDT	Severe Thunderstorm Warning	FFC	Banks, Hall, Jackson	49 min
Jul 8, 11:56 PM EDT	Flash Flood Warning	FFC	Forsyth	6 hr
Jul 9, 5:29 PM EDT	Severe Thunderstorm Warning	FFC	Bartow, Cherokee, Cobb	34 min

Nearby

Flash Flood Warnings in Georgia, 2008 Every flash flood warning in 2008

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.