Alert archive / Georgia / Flash Flood Warnings in 2007

Flash Flood Warning 3, NWS Atlanta, GA

July 9, 2007Dawson County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jul 9, 2007, 3:49 PM EDT for Dawson County, Georgia. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 9, 2007, 3:49 PM EDT (19:49 UTC)
Expired: Jul 9, 2007, 6:45 PM EDT
In force: 3 hr
Issued by: NWS Atlanta, GA
Area: Whole counties

County Dawson County, GA

The radar

The Atlanta radar (KFFC), 126 km from the middle of the area, began a volume at 19:51 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, 7.8 hours before the alert went out and 123 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: 290 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 829 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: -7 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 091950
FFWFFC
GAC085-092245-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
349 PM EDT MON JUL 9 2007

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

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

* UNTIL 645 PM EDT

* AT 347 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAINFALL FROM A THUNDERSTORM 6 MILES SOUTHWEST OF       
  AMICALOLA FALLS STATE PARK. THIS STORM WAS MOVING EAST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO      
  JUNO AND MCKEE.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS...STREAMS AND COUNTRY ROADS. CAMPERS AND HIKERS SHOULD AVOID 
STREAMS OR CREEKS.

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 8441 3440 8425 3443 8405 3458 8420

$$

1 follow-up statement

000 
WGUS72 KFFC 092126
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
524 PM EDT MON JUL 9 2007

GAC085-092134-
DAWSON GA-
524 PM EDT MON JUL 9 2007

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR DAWSON COUNTY...

THE THUNDERSTORM THAT PROMPTED THE FLASH FLOOD WARNING FOR DAWSON
COUNTY EARLIER HAS DISSIPATED.  ALL SIGNIFICANT RAIN HAS EITHER
DISSIPATED OR EXITED THE COUNTY. A FEW CREEKS AND STREAMS IN THE 
NORTHERN PART OF THE COUNTY...NEAR AMICALOLA FALLS AND JUNO...COULD 
STILL BE NEAR BANKFULL FOR A SHORT WHILE...BUT FLASH FLOODING IS NO 
LONGER AN IMMEDIATE CONCERN.

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 8441 3440 8425 3443 8405 3458 8420

$$


19

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 2:42 PM EDT	Severe Thunderstorm Warning	FFC	Bartow, Cherokee	34 min
Jul 9, 4:25 PM EDT	Flash Flood Warning	FFC	Union	3 hr
Jul 9, 4:30 PM EDT	Severe Thunderstorm Warning	FFC	Bartow	45 min
Jul 9, 4:37 PM EDT	Severe Thunderstorm Warning	FFC	Pike	38 min

Nearby

Flash Flood Warnings in Georgia, 2007 Every flash flood warning in 2007

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.