Alert archive / Georgia / Flash Flood Warnings in 2013

Flash Flood Warning 77, NWS Atlanta, GA

August 10, 2013Lumpkin County, Union County, White County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 10, 2013, 6:39 PM EDT for Lumpkin County, Union County, White County, Georgia. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 10, 2013, 6:39 PM EDT (22:39 UTC)
Expired
Aug 11, 2013, 12:45 AM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties Lumpkin County, GA, Union County, GA, White County, GA

The radar

The Greer radar (KGSP), 139 km from the middle of the area, began a volume at 22:41 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, 10.7 hours before the alert went out and 170 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 2013-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1521 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 2013-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 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
1521 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
752 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
-5 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.

335 
WGUS52 KFFC 102239
FFWFFC
GAC187-291-311-110445-
/O.NEW.KFFC.FF.W.0077.130810T2239Z-130811T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
639 PM EDT SAT AUG 10 2013

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN LUMPKIN COUNTY IN NORTH CENTRAL GEORGIA
  SOUTHEASTERN UNION COUNTY IN NORTH CENTRAL GEORGIA
  NORTHERN WHITE COUNTY IN NORTHEAST GEORGIA

* UNTIL 1245 AM EDT

* AT 636 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM 8
  MILES WEST OF HELEN TO HELEN TO 7 MILES SOUTHEAST OF HELEN..MOVING
  NORTHEAST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  UNICOI STATE PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...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 3484 8379 3483 8380 3482 8378 3479 8377
      3480 8368 3477 8363 3475 8362 3466 8365
      3463 8363 3458 8363 3469 8403 3487 8382

$$
1 follow-up statement
528 
WGUS72 KFFC 110125
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
925 PM EDT SAT AUG 10 2013

GAC187-291-311-110135-
/O.CAN.KFFC.FF.W.0077.000000T0000Z-130811T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WHITE GA-UNION GA-LUMPKIN GA-
925 PM EDT SAT AUG 10 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN
LUMPKIN...SOUTHEASTERN UNION AND NORTHERN WHITE COUNTIES...

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 3484 8379 3483 8380 3482 8378 3479 8377
      3480 8368 3477 8363 3475 8362 3466 8365
      3463 8363 3458 8363 3469 8403 3487 8382

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 2:06 PM EDTSpecial Weather StatementFFCWhitfield24 min
Aug 10, 3:19 PM EDTSpecial Weather StatementFFCJackson26 min
Aug 10, 4:31 PM EDTSpecial Weather StatementFFCDeKalb59 min
Aug 10, 5:39 PM EDTSpecial Weather StatementFFCBartow51 min
Aug 10, 6:34 PM EDTSpecial Weather StatementFFCWhite26 min
Aug 10, 7:07 PM EDTSpecial Weather StatementFFCPaulding38 min
Aug 10, 7:21 PM EDTRiver Flood WarningFFCForsyth, Fulton16 hr
Aug 10, 7:40 PM EDTSpecial Weather StatementFFCFulton35 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.