Alert archive / Georgia / Flash Flood Warnings in 2012

Flash Flood Warning 25, NWS Greenville-Spartanburg, SC

August 25, 2012Rabun County, Georgia

NWS Greenville-Spartanburg, SC issued this flash flood warning at Aug 25, 2012, 5:23 PM EDT for Rabun 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 outline as issued.

The facts

Issued
Aug 25, 2012, 5:23 PM EDT (21:23 UTC)
Expired
Aug 25, 2012, 8:30 PM EDT
In force
3 hr
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon
Flood severity
None

County Rabun County, GA

The radar

The Greer radar (KGSP), 111 km from the middle of the area, began a volume at 21:23 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, 9.4 hours before the alert went out and 189 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 2012-08-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 500 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 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 2012-08-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -42 square meters per square second.1939Sfc1 km3 km6 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
500 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
631 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
-42 m²/s²
0-3 km storm-relative helicity
-23 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.

403 
WGUS52 KGSP 252123
FFWGSP
GAC241-260030-
/O.NEW.KGSP.FF.W.0025.120825T2123Z-120826T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
523 PM EDT SAT AUG 25 2012

THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL RABUN COUNTY IN NORTHEAST GEORGIA...

* UNTIL 830 PM EDT

* AT 520 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE      
  WARNED AREA. RADAR ESTIMATES THAT IN EXCESS OF 3 INCHES HAS        
  OCCURRED IN THE TIGER CREEK BASIN SINCE 430 PM. AN ADDITIONAL ONE  
  HALF INCH TO AN INCH OF RAIN IS LIKELY. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO   
  OCCUR. THE MAIN STREAM THAT IS EXPECTED TO BE AFFECTED IS TIGER    
  CREEK. HOWEVER...OTHER STREAMS IN THE WARNED AREA COULD SEE FLASH  
  FLOODING AS WELL...INCLUDING STEKOA CREEK. 

OTHER STREAMS AND BASINS THAT COULD BE AFFECTED INCLUDE...
CHECHERO CREEK...BRIDGE CREEK...TIMPSON CREEK...BOEN CREEK...DADS 
CREEK...AND CLIFF CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

TO REPORT HIGH WATER...FLOODING...MUDSLIDES...LANDSLIDES OR OTHER
SEVERE WEATHER THROUGH OUR AUTOMATED REPORTING SYSTEM...CALL OUR TOLL
FREE NUMBER... 1 8 7 7...6 3 3...6 7 7 2.

&&

LAT...LON 3478 8338 3478 8350 3488 8351 3488 8338

$$
LANE
1 follow-up statement
419 
WGUS72 KGSP 252226
FFSGSP

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
626 PM EDT SAT AUG 25 2012

GAC241-260030-
/O.CON.KGSP.FF.W.0025.000000T0000Z-120826T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RABUN GA-
626 PM EDT SAT AUG 25 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR CENTRAL RABUN COUNTY
UNTIL 830 PM EDT...

AT 621 PM EDT...ALTHOUGH HEAVY RAIN HAS ENDED ACROSS THE WARNING 
AREA...DOPPLER RADAR ESTIMATES THAT 3 TO 4 INCHES OF RAIN HAS FALLEN 
SINCE 430 PM IN THE TIGER CREEK AND STEKOA CREEK BASINS IN THE TIGER 
COMMUNITY. AS WATER FROM THIS HEAVY RAIN CONTINUES TO MOVE 
DOWNSTREAM...FLOODING IS EXPECTED TO DEVELOP IN LOW SPOTS ALONG 
THESE STREAMS. ADDITIONAL FLOODING MAY BE SEEN IN SMALL TRIBUTARIES 
FEEDING THESE STREAMS AS WELL.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS
AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES... AS WELL AS
FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 3478 8338 3478 8350 3488 8351 3488 8338

$$
LANE

The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 25, 4:23 PM EDTSpecial Weather StatementGSPRabun52 min
Aug 25, 4:49 PM EDTSpecial Weather StatementGSPRabun41 min
Aug 25, 5:01 PM EDTSevere Thunderstorm WarningGSPHabersham, Rabun43 min
Aug 25, 7:55 PM EDTSpecial Weather StatementGSPRabun20 min

Nearby

Flash Flood Warnings in Georgia, 2012Every flash flood warning in 2012

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.