Alert archive / Georgia / Flash Flood Warnings in 2012

Flash Flood Warning 17, NWS Atlanta, GA

August 7, 2012Banks County, Jackson County, Madison County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 7, 2012, 8:12 PM EDT for Banks County, Jackson County, Madison County, Georgia. It was in force for 2 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 7, 2012, 8:12 PM EDT (00:12 UTC)
Expired
Aug 7, 2012, 10:20 PM EDT
In force
2 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties Banks County, GA, Jackson County, GA, Madison County, GA

The radar

The Greer radar (KGSP), 122 km from the middle of the area, began a volume at 00:12 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 00:00Z, 0.2 hours before the alert went out and 148 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 00:00Z on 2012-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 294 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 00:00Z on 2012-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.193958Sfc1 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
294 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1066 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
25 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.

156 
WGUS52 KFFC 080012
FFWFFC
GAC011-157-195-080600-
/O.NEW.KFFC.FF.W.0017.120808T0012Z-120808T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
812 PM EDT TUE AUG 7 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN BANKS COUNTY IN NORTHEAST GEORGIA
  NORTHEASTERN JACKSON COUNTY IN NORTHEAST GEORGIA
  NORTHWESTERN MADISON COUNTY IN NORTHEAST GEORGIA

* UNTIL 200 AM EDT

* AT 802 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  THUNDERSTORMS WITH HEAVY RAIN MAY BE CAUSING FLASH FLOODING OVER   
  THE WARNED AREA. RAINFALL AMOUNTS UP TO 3 INCHES HAS OCCURRED      
  SINCE 630 PM EDT. SOME CREEKS THAT MAY FLOOD ARE CROOKED CREEK...  
  BEAVERDAM CREEK...BORDERS CREEK AND GROVE CREEK.

  ANOTHER INCH OR TWO OF RAIN IS POSSIBLE BEFORE IT ENDS THIS LATER  
  THIS EVENING.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MAYSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...AS WELL AS HIGHWAYS AND UNDERPASSES. THIS WILL 
INCLUDE INTERSTATE 85.

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 3432 8338 3425 8333 3427 8330 3425 8325
      3425 8319 3425 8316 3426 8314 3426 8313
      3408 8314 3413 8362 3433 8358

$$

16
1 follow-up statement
936 
WGUS72 KFFC 080220
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1020 PM EDT TUE AUG 7 2012

GAC011-157-195-080245-
/O.CAN.KFFC.FF.W.0017.000000T0000Z-120808T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MADISON GA-BANKS GA-JACKSON GA-
1020 PM EDT TUE AUG 7 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN
JACKSON...SOUTHERN BANKS AND NORTHWESTERN MADISON COUNTIES...

EARLIER THIS EVENING...RAINFALL AMOUNTS OF 3 TO 4 INCHES OCCURRED
OVER THE BANKS...JACKSON AND MADISON COUNTY LINES NEAR BANKS 
CROSSING. COUNTY OFFICIALS FOR THE THREE COUNTIES HAVE INDICATED NO 
REPORTS OF SIGNIFICANT FLOODING ON CREEKS OR RIVERS IN THE WARNED 
AREA. THERE WERE SEVERAL REPORTS OF CAR ACCIDENTS...ESPECIALLY ON 
INTERSTATE 85 NEAR BANKS CROSSING.

THE RAIN HAS ENDED OVER THE WARNED AREA AND THE WARNING HAS BEEN
CANCELLED.

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 3432 8338 3425 8333 3427 8330 3425 8325
      3425 8319 3425 8316 3426 8314 3426 8313
      3408 8314 3413 8362 3433 8358

$$

16

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 8:58 PM EDTSpecial Weather StatementFFCJones, Monroe62 min
Aug 8, 4:18 PM EDTSpecial Weather StatementFFCWhite27 min
Aug 8, 4:38 PM EDTSpecial Weather StatementFFCWhite37 min
Aug 8, 5:10 PM EDTSpecial Weather StatementFFCHall35 min
Aug 8, 5:16 PM EDTSevere Thunderstorm WarningFFCBanks, Hall44 min
Aug 8, 5:31 PM EDTSpecial Weather StatementFFCJackson29 min
Aug 8, 5:41 PM EDTSpecial Weather StatementFFCWhite79 min
Aug 8, 6:00 PM EDTSpecial Weather StatementFFCJackson90 min
Aug 8, 6:01 PM EDTSpecial Weather StatementFFCClarke, Oconee29 min
Aug 8, 6:05 PM EDTSpecial Weather StatementFFCHall25 min
Aug 8, 6:16 PM EDTSpecial Weather StatementFFCBartow, Floyd29 min
Aug 8, 6:27 PM EDTSpecial Weather StatementFFCClarke, Oconee63 min
Aug 8, 6:30 PM EDTSpecial Weather StatementFFCWhitfield30 min
Aug 8, 6:34 PM EDTSpecial Weather StatementFFCHall26 min
Aug 8, 6:47 PM EDTSpecial Weather StatementFFCBarrow28 min
Aug 8, 7:01 PM EDTSpecial Weather StatementFFCWhitfield29 min
Aug 8, 7:16 PM EDTSpecial Weather StatementFFCBarrow, Gwinnett, Walton29 min
Aug 8, 7:38 PM EDTSpecial Weather StatementFFCGordon37 min
Aug 8, 7:41 PM EDTSpecial Weather StatementFFCDeKalb, Gwinnett, Walton34 min
Aug 8, 7:55 PM EDTSpecial Weather StatementFFCChattooga35 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.