Alert archive / Georgia / Flash Flood Warnings in 2018

Flash Flood Warning 46, NWS Atlanta, GA

November 12, 201810 counties in Georgia

NWS Atlanta, GA issued this flash flood warning at Nov 12, 2018, 4:39 PM EST for 10 counties in Georgia. It was in force for 6 hr. 4 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
Nov 12, 2018, 4:39 PM EST (21:39 UTC)
Expired
Nov 12, 2018, 10:30 PM EST
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties Bartow County, GA, Carroll County, GA, Cherokee County, GA, Cobb County, GA, Floyd County, GA, Fulton County, GA, Haralson County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA

The radar

The Atlanta radar (KFFC), 86 km from the middle of the area, began a volume at 21:42 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
Nov 12, 5:10 PM ESTFLASH FLOOD2 W Mount Bethel, GAFLOODING OF A SOCCER FIELD AND SURROUNDING AREAS WAS REPORTED ON ROBINSON ROAD NEAR FULLERS PARK.
Nov 12, 5:10 PM ESTFLASH FLOOD3 N Due West, GAMULTIPLE ROADS WERE REPORTED TO HAVE WATER OVER THEM INCLUDING JIM OWENS ROAD NEAR ACWORTH DUE WEST ROAD; OLD STILESBORO ROAD; AND COUNTY LINE ROAD.
Nov 12, 5:10 PM ESTFLASH FLOOD3 Sw Burnt Hickory Ridg, GARACCOON CREEK ROAD WAS REPORTED CLOSED DUE TO WATER OVER THE ROADWAY.
Nov 12, 8:30 PM ESTFLASH FLOOD2 Wsw Sweat Mountain, GAWATER WAS REPORTED OVER THE ROADWAY ON THE ROAD LEADING TO THE POOL AND CLUBHOUSE OFF OF KEMP ROAD.

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, 9.7 hours before the alert went out and 85 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 2018-11-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°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 2018-11-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 189 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
445 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
189 m²/s²
0-3 km storm-relative helicity
278 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

450 
WGUS52 KFFC 122139
FFWFFC
GAC015-045-057-067-115-121-143-223-227-233-130330-
/O.NEW.KFFC.FF.W.0046.181112T2139Z-181113T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
439 PM EST MON NOV 12 2018

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Paulding County in northwestern Georgia...
  Cherokee County in north central Georgia...
  Northwestern Carroll County in northwestern Georgia...
  Cobb County in north central Georgia...
  Haralson County in northwestern Georgia...
  Southeastern Floyd County in northwestern Georgia...
  Northeastern Fulton County in north central Georgia...
  Polk County in northwestern Georgia...
  Pickens County in north central Georgia...
  Bartow County in northwestern Georgia...

* Until 1030 PM EST.

* At 434 PM EST, several reports of water over roadways have 
  occurred in an area that received up to three inches of heavy 
  rain. An additional half to one inch may fall this evening as 
  well. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Marietta, Canton, Cartersville, Dallas, Cedartown, Jasper,
  Buchanan, Sandy Springs, Roswell, Johns Creek, Alpharetta, Smyrna,
  Dunwoody, Milton, Kennesaw, Woodstock, Acworth, Villa Rica, Powder
  Springs and Holly Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Please report flooding to your local law enforcement agency when you
can do so safely.

&&

LAT...LON 3442 8468 3441 8465 3443 8465 3455 8442
      3456 8435 3447 8432 3447 8426 3411 8426
      3407 8417 3400 8418 3400 8424 3396 8428
      3397 8434 3393 8435 3377 8485 3378 8490
      3376 8490 3362 8533 3404 8541

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 12, 1:08 PM ESTRiver Flood WarningFFCForsyth, Fulton4 days
Nov 12, 1:32 PM ESTRiver Flood WarningFFCGwinnett24 hr
Nov 12, 1:37 PM ESTRiver Flood WarningFFCFulton, Gwinnett9 hr
Nov 12, 1:42 PM ESTRiver Flood WarningFFCCobb24 hr
Nov 12, 2:27 PM ESTFlood WatchFFCBanks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 38 more12 hr
Nov 12, 3:09 PM ESTRiver Flood WarningFFCForsyth24 hr
Nov 12, 3:37 PM ESTRiver Flood WarningFFCGwinnett9 hr
Nov 12, 3:50 PM ESTRiver Flood WarningFFCCherokee, Cobb24 hr
Nov 12, 4:00 PM ESTRiver Flood WarningFFCPolk24 hr
Nov 12, 4:05 PM ESTRiver Flood WarningFFCCobb24 hr
Nov 12, 4:56 PM ESTRiver Flood WarningFFCCobb24 hr
Nov 12, 5:10 PM ESTFlash Flood WarningFFCDawson, Forsyth, Gilmer, Lumpkin6 hr
Nov 12, 5:18 PM ESTRiver Flood WarningFFCCobb, Fulton13 hr
Nov 12, 6:02 PM ESTRiver Flood WarningFFCCobb, Fulton9 hr
Nov 12, 6:21 PM ESTRiver Flood WarningFFCDawson, Forsyth15 hr
Nov 12, 6:31 PM ESTRiver Flood WarningFFCCherokee15 hr
Nov 12, 6:38 PM ESTRiver Flood WarningFFCCobb24 hr
Nov 12, 6:52 PM ESTRiver Flood WarningFFCFulton24 hr
Nov 12, 6:59 PM ESTRiver Flood WarningFFCGwinnett, Walton24 hr

Nearby

Flash Flood Warnings in Georgia, 2018Every flash flood warning in 2018

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.