Alert archive / Georgia / Flash Flood Warnings in 2013

Flash Flood Warning 70, NWS Atlanta, GA

August 7, 2013Cherokee County, Dawson County, Forsyth County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 7, 2013, 8:49 AM EDT for Cherokee County, Dawson County, Forsyth County, Georgia. It was in force for 6 hr. 9 reports 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
Aug 7, 2013, 8:49 AM EDT (12:49 UTC)
Expired
Aug 7, 2013, 2:45 PM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties Cherokee County, GA, Dawson County, GA, Forsyth County, GA

The radar

The Atlanta radar (KFFC), 108 km from the middle of the area, began a volume at 12:50 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

TimeReportWhereRemark
Aug 7, 8:55 AM EDTFLASH FLOOD1 W Chestatee, GAGRINDLE ROAD CLOSED DUE TO FLOODING JUST NORTH OF HIGHWAY 306.
Aug 7, 8:58 AM EDTFLASH FLOOD1 W Chestatee, GAGRINDLE ROAD IS REPORTED CLOSED DUE TO WATER OVER THE ROAD.
Aug 7, 10:00 AM EDTHEAVY RAIN 6.91Dawsonville, GATHIS IS A 24 HOUR TOTAL ENDING AT 10 AM THIS MORNING FROM A RAWS SITE.
Aug 7, 10:37 AM EDTFLASH FLOOD1 Se Ball Ground, GAEMERGENCY MANAGER REPORTS THE 911 CENTER IS RECEIVING REPORTS OF FLOODED ROADS IN THE AREA OF BALL GROUND ROAD AND CONNS CREEK ROAD AT HWY 372.
Aug 7, 11:00 AM EDTHEAVY RAIN 7.645 Se Dawsonville, GATHIS IS A 24 HOUR TOTAL ENDING AT 11 AM THIS MORNING FROM A RAWS SITE.
Aug 7, 11:43 AM EDTFLASH FLOODDawsonville, GAMANY ROADS IMPACTED IN DAWSON COUNTY WITH FLASH FLOODING PER THE EM RESULTING IN ALL OF THESE ROADS CLOSED. HERE IS THE LIST...LUMPKIN CAMPGROUND ROAD SOUTH HAS ONE LANE CLOSED FOR TREE REMOVAL...PINE BRIDGE ROAD CLOSED...RIVER ACCESS RAMP AT ETOWAH RIVER THOM
Aug 7, 12:00 PM EDTHEAVY RAIN 8.185 Se Dawsonville, GATHIS IS A 24 HOUR TOTAL ENDING AT NOON TODAY FROM A RAWS SITE.
Aug 7, 12:12 PM EDTFLASH FLOOD2 Ese Nelson, GATHE FOLLOWING AREAS IN CHEROKEE COUNTY ARE EXPERIENCING FLASH FLOODING PER THE EM. SPERIN ROAD NEAR CONNS CREEK ROAD FLOODED WITH FIRE UNITS ONLY ABLE TO ACCESS THE AREA FROM THE PICKENS COUNTY SIDE. CONNS CREEK ROAD AREA HAS SEVERAL OUT BUILDINGS WASHED AWAY
Aug 7, 12:25 PM EDTFLASH FLOOD6 Sw Cumming, GATHE STAGE HEIGHT AT A USGS STREAM GAGE ON THE BIG CREEK AT ATLANTA HIGHWAY NEAR CUMMING REACHED FLOOD STAGE OF 6 FEET. THE CREEK CREST AT 7.6 FEET. MINOR FLOODING OCCURRED OF THE BIG CREEK GREENWAY...WOODLANDS AND FIELDS.

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 12:00Z, 0.8 hours before the alert went out and 106 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 2013-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1269 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 2013-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 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
1269 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
492 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
12 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.

319 
WGUS52 KFFC 071249
FFWFFC
GAC057-085-117-071845-
/O.NEW.KFFC.FF.W.0070.130807T1249Z-130807T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
849 AM EDT WED AUG 7 2013

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN CHEROKEE COUNTY IN NORTH CENTRAL GEORGIA
  DAWSON COUNTY IN NORTH CENTRAL GEORGIA
  FORSYTH COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 245 PM EDT WEDNESDAY

* AT 839 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A CLUSTER OF THUNDERSTORMS WITH HEAVY RAIN FLASH WHICH WILL LIKELY 
  PRODUCE FLASH FLOODING ON NUMEROUS CREEKS IN THE WARNED AREA THIS  
  MORNING. THE STORMS WERE SLOWLY MOVING EAST...BUT HAVE BEEN BACK   
  BUILDING AND TRAINING OVER THE SAME AREAS. RAINFALL AMOUNTS OF 2   
  TO 4 INCHES HAVE ALREADY OCCURRED WITH AN ISOLATED 6.5 INCHES IN   
  SOUTHEAST DAWSON COUNTY. ADDITIONAL RAINFALL AMOUNTS OF ANOTHER 2  
  INCHES MAY OCCUR THIS MORNING.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  DAWSONVILLE...FREE HOME...BUFFINGTON AND BALL GROUND.

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 3441 8397 3435 8398 3428 8393 3422 8397
      3419 8405 3415 8409 3407 8412 3405 8410
      3411 8426 3419 8426 3419 8433 3414 8436
      3418 8445 3439 8444 3438 8426 3447 8426
      3449 8433 3449 8432 3449 8414

$$


16
1 follow-up statement
561 
WGUS72 KFFC 071452
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1052 AM EDT WED AUG 7 2013

GAC057-085-117-071845-
/O.CON.KFFC.FF.W.0070.000000T0000Z-130807T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHEROKEE GA-DAWSON GA-FORSYTH GA-
1052 AM EDT WED AUG 7 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 PM EDT FOR
FORSYTH...DAWSON AND EASTERN CHEROKEE COUNTIES...

...SEVERAL ROADS ARE FLOODING RAPIDLY IN NORTHEAST CHEROKEE 
COUNTY...

AT 1045 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
SHOW A CLUSTER OF THUNDERSTORMS WITH HEAVY RAIN WHICH IS LIKELY
CAUSING FLASH FLOODING ON NUMEROUS CREEKS AND STREAMS IN THE WARNED 
AREA. RAINFALL AMOUNTS OF 4 TO 8 INCHES HAVE OCCURRED FROM NEAR
BALL GROUND TO DAWSONVILLE AND DOUGHERTY TO COAL MOUNTAIN. ISOLATED 
RAINFALL ESTIMATES OF 10 INCHES HAVE OCCURRED IN THE NORTHEAST 
CORNER OF CHEROKEE COUNTY NEAR NELSON WITH ANOTHER INCH OR TWO 
POSSIBLE.

FLOOD WATERS ARE MOVING DOWN LONG SWAMP CREEK...SETTINGDOWN 
CREEK...CANE CREEK AND THE ETOWAH RIVER AT THIS TIME. PUBLIC REPORTS 
OF FLOODED ROADS IN NORTHEAST CHEROKEE COUNTY ARE BEING RECEIVED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER
GROUND.

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 3441 8397 3435 8398 3428 8393 3422 8397
      3419 8405 3415 8409 3407 8412 3405 8410
      3411 8426 3419 8426 3419 8433 3414 8436
      3418 8445 3439 8444 3438 8426 3447 8426
      3449 8433 3449 8432 3449 8414

$$


16

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 8:08 PM EDTSpecial Weather StatementFFCGordon52 min
Aug 7, 2:38 AM EDTFlash Flood WarningFFCDawson, Lumpkin6 hr
Aug 7, 3:34 AM EDTFlash Flood WarningFFCCherokee, Dawson, Pickens6 hr
Aug 7, 5:24 AM EDTFlash Flood WarningFFCDawson, Gilmer, Pickens6 hr
Aug 7, 5:30 AM EDTRiver Flood WarningFFCDawson, Forsyth15 hr
Aug 7, 6:06 AM EDTFlash Flood WatchFFCBanks, Barrow, Bartow, Butts, Carroll, Catoosa and 50 more48 hr
Aug 7, 6:53 AM EDTRiver Flood WarningFFCGilmer8 hr
Aug 7, 7:01 AM EDTFlash Flood WarningFFCGordon6 hr
Aug 7, 9:18 AM EDTRiver Flood WarningFFCGilmer5 hr
Aug 7, 9:18 AM EDTRiver Flood WarningFFCGilmer5 hr
Aug 7, 11:05 AM EDTSpecial Weather StatementFFCCoweta55 min
Aug 7, 11:14 AM EDTFlash Flood WarningFFCGilmer, Pickens6 hr
Aug 7, 11:17 AM EDTFlash Flood WarningFFCCoweta6 hr
Aug 7, 11:36 AM EDTSpecial Weather StatementFFCForsyth54 min
Aug 7, 11:58 AM EDTRiver Flood WarningFFCForsyth17 hr
Aug 7, 12:13 PM EDTRiver Flood WarningFFCCherokee28 hr
Aug 7, 12:33 PM EDTSpecial Weather StatementFFCGwinnett57 min
Aug 7, 12:57 PM EDTSpecial Weather StatementFFCBarrow, Jackson, Madison78 min
Aug 7, 1:26 PM EDTSpecial Weather StatementFFCWalker64 min
Aug 7, 1:31 PM EDTSpecial Weather StatementFFCBanks, Hall59 min
Aug 7, 2:09 PM EDTSpecial Weather StatementFFCClarke, Greene, Madison, Morgan, Oconee, Oglethorpe and 1 more66 min
Aug 7, 2:40 PM EDTAreal Flood WarningFFCCherokee6 hr
Aug 7, 2:54 PM EDTSpecial Weather StatementFFCBartow66 min
Aug 7, 3:03 PM EDTRiver Flood WarningFFCCherokee25 hr
Aug 7, 3:03 PM EDTRiver Flood WarningFFCForsyth, Fulton43 hr
Aug 7, 3:16 PM EDTSpecial Weather StatementFFCGreene, Oglethorpe, Taliaferro, Wilkes59 min
Aug 7, 3:25 PM EDTSpecial Weather StatementFFCTalbot, Upson65 min
Aug 7, 3:40 PM EDTSpecial Weather StatementFFCGordon65 min
Aug 7, 3:53 PM EDTSpecial Weather StatementFFCCatoosa, Dade, Walker, Whitfield67 min
Aug 7, 4:18 PM EDTSpecial Weather StatementFFCHancock, Taliaferro, Warren57 min
Aug 7, 4:44 PM EDTSpecial Weather StatementFFCBaldwin, Bibb, Jones61 min
Aug 7, 4:57 PM EDTAreal Flood WarningFFCBanks12 hr
Aug 7, 5:00 PM EDTSpecial Weather StatementFFCGilmer, Gordon, Pickens45 min
Aug 7, 5:04 PM EDTSpecial Weather StatementFFCChattooga56 min
Aug 7, 5:08 PM EDTAreal Flood WarningFFCGilmer, Pickens12 hr
Aug 7, 5:28 PM EDTSpecial Weather StatementFFCPaulding, Polk47 min
Aug 7, 6:11 PM EDTSpecial Weather StatementFFCHaralson64 min
Aug 7, 6:19 PM EDTSpecial Weather StatementFFCFloyd56 min
Aug 7, 6:46 PM EDTSpecial Weather StatementFFCButts59 min
Aug 7, 7:31 PM EDTSpecial Weather StatementFFCCarroll59 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.