Alert archive / Georgia / Flash Flood Warnings in 2018

Flash Flood Warning 45, NWS Atlanta, GA

October 10, 201812 counties in Georgia

NWS Atlanta, GA issued this flash flood warning at Oct 10, 2018, 8:59 PM EDT for 12 counties in 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
Oct 10, 2018, 8:59 PM EDT (00:59 UTC)
Expired
Oct 11, 2018, 3:00 AM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties Chattahoochee County, GA, Crisp County, GA, Dooly County, GA, Houston County, GA, Macon County, GA, Marion County, GA, Muscogee County, GA, Schley County, GA, Stewart County, GA, Sumter County, GA, Taylor County, GA, Webster County, GA

The radar

The Robins AFB radar (KJGX), 119 km from the middle of the area, began a volume at 00:58 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, 1.0 hours before the alert went out and 144 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 2018-10-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 382 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 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 00:00Z on 2018-10-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 308 square meters per square second.193958Sfc1 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
382 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
474 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
308 m²/s²
0-3 km storm-relative helicity
350 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.4

Open this sounding in Storm Lab

The text

As transmitted.

990 
WGUS52 KFFC 110059
FFWFFC
GAC053-081-093-153-193-197-215-249-259-261-269-307-110700-
/O.NEW.KFFC.FF.W.0045.181011T0059Z-181011T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
859 PM EDT WED OCT 10 2018

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Macon County in west central Georgia...
  Marion County in west central Georgia...
  Southern Muscogee County in west central Georgia...
  Chattahoochee County in west central Georgia...
  Dooly County in central Georgia...
  Stewart County in west central Georgia...
  Webster County in west central Georgia...
  Southwestern Houston County in central Georgia...
  Schley County in west central Georgia...
  Sumter County in west central Georgia...
  Southwestern Taylor County in west central Georgia...
  Crisp County in central Georgia...

* Until 300 AM EDT Thursday.

* At 858 PM EDT, Doppler radar indicated heavy rain across the warned
  area. Up to three inches of rain have already fallen. Flash
  flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Americus, Cordele, Vienna, Lumpkin, Buena Vista, Ellaville,
  Oglethorpe, Preston, Cusseta, Unadilla, Montezuma, Richland,
  Marshallville, Plains, Arabi, Byromville, Ideal, Pinehurst, Leslie
  and Andersonville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

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

&&

LAT...LON 3181 8381 3185 8394 3190 8393 3191 8392
      3192 8434 3187 8434 3197 8444 3193 8444
      3192 8491 3198 8496 3199 8507 3213 8506
      3226 8489 3233 8501 3242 8496 3248 8499
      3252 8448 3247 8394 3234 8358 3180 8361

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 10, 9:49 PM EDTSpecial Weather StatementFFCHenry26 min
Oct 10, 9:51 PM EDTSpecial Weather StatementFFCHarris, Meriwether, Muscogee, Talbot, Troup84 min
Oct 10, 10:51 PM EDTAreal Flood WarningFFCChattahoochee, Coweta, Fayette, Harris, Heard, Marion and 7 more6 hr
Oct 10, 11:10 PM EDTAreal Flood WarningFFCCarroll, Clayton, Cobb, Douglas, Fulton, Haralson and 2 more6 hr
Oct 10, 11:23 PM EDTAreal Flood WarningFFCBibb, Bleckley, Butts, Crawford, Dodge, Henry and 11 more6 hr
Oct 10, 11:57 PM EDTAreal Flood WarningFFCBarrow, Bartow, Cherokee, DeKalb, Forsyth, Fulton and 9 more6 hr
Oct 11, 12:14 AM EDTAreal Flood WarningFFCBaldwin, Emanuel, Glascock, Greene, Hancock, Jefferson and 8 more6 hr
Oct 11, 1:46 AM EDTRiver Flood WarningFFCDeKalb, Fulton24 hr
Oct 11, 1:46 AM EDTRiver Flood WarningFFCDeKalb, Fulton24 hr
Oct 11, 1:50 AM EDTRiver Flood WarningFFCCobb6 hr
Oct 11, 2:20 AM EDTRiver Flood WarningFFCFulton2 hr
Oct 11, 3:05 AM EDTRiver Flood WarningFFCForsyth, Fulton25 hr
Oct 11, 3:12 AM EDTRiver Flood WarningFFCForsyth7 hr
Oct 11, 3:27 AM EDTSpecial Weather StatementFFCGilmer, Gordon, Murray, Pickens, Whitfield93 min
Oct 11, 6:26 AM EDTRiver Flood WarningFFCCobb8 hr
Oct 11, 1:38 PM EDTRiver Flood WarningFFCGwinnett7 hr
Oct 11, 2:38 PM EDTRiver Flood WarningFFCCobb, Paulding20 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.