Alert archive / Georgia / Flash Flood Watches in 2018

Flash Flood Watch 2, NWS Atlanta, GA

May 23, 201840 counties in Georgia

NWS Atlanta, GA issued this flash flood watch at May 23, 2018, 2:31 PM EDT for 40 counties in Georgia. It took effect at May 23, 2018, 3:00 PM EDT. It was in force for 20 hr.

The area

The counties it named.

The facts

Issued
May 23, 2018, 2:31 PM EDT (18:31 UTC)
In effect from
May 23, 2018, 3:00 PM EDT
Expired
May 24, 2018, 11:00 AM EDT
In force
20 hr
Issued by
NWS Atlanta, GA
Flood severity
None
All 40 counties

Baldwin County, GA, Bibb County, GA, Bleckley County, GA, Chattahoochee County, GA, Crawford County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Emanuel County, GA, Glascock County, GA, Hancock County, GA, Harris County, GA, Houston County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Laurens County, GA, Macon County, GA, Marion County, GA, Monroe County, GA, Montgomery County, GA, Muscogee County, GA, Peach County, GA, Pulaski County, GA, Schley County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Twiggs County, GA, Upson County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Wilkinson County, GA

The radar

The Robins AFB radar (KJGX), 25 km from the middle of the area, began a volume at 18:32 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, 6.5 hours before the alert went out and 128 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 2018-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 223 joules per kilogram.LCLEL10008507005003002001001 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 2018-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 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
223 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
475 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
-18 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

676 
WGUS62 KFFC 231831
FFAFFC

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Peachtree City GA
231 PM EDT Wed May 23 2018


GAZ061-062-069-071>076-078>086-089>098-102>113-241500-
/O.NEW.KFFC.FF.A.0002.180523T1900Z-180524T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hancock-Warren-Upson-Monroe-Jones-Baldwin-Washington-Glascock-
Jefferson-Harris-Talbot-Taylor-Crawford-Bibb-Twiggs-Wilkinson-
Johnson-Emanuel-Muscogee-Chattahoochee-Marion-Schley-Macon-Peach-
Houston-Bleckley-Laurens-Treutlen-Stewart-Webster-Sumter-Dooly-
Crisp-Pulaski-Wilcox-Dodge-Telfair-Wheeler-Montgomery-Toombs-
Including the cities of Milledgeville, Macon, Swainsboro, 
Columbus, Warner Robins, Dublin, Lumpkin, Americus, Cordele, 
and Vidalia
231 PM EDT Wed May 23 2018

...FLASH FLOOD WATCH IN EFFECT THROUGH THURSDAY MORNING...

The National Weather Service in Peachtree City has issued a

* Flash Flood Watch for portions of central Georgia...east 
  central Georgia...southeast Georgia and west central Georgia...
   including the following areas...in central Georgia...
  Baldwin... Bibb...Bleckley...Crawford...Crisp...Dodge...
  Dooly...Houston... Jones...Laurens...Monroe...Montgomery...
  Peach...Pulaski... Telfair...Twiggs...Wheeler...Wilcox and 
  Wilkinson. In east central Georgia...Emanuel...Glascock...
  Hancock...Jefferson... Johnson...Treutlen...Warren and 
  Washington. In southeast Georgia...Toombs. In west central 
  Georgia...Chattahoochee... Harris...Macon...Marion...
  Muscogee...Schley...Stewart... Sumter...Talbot...Taylor...
  Upson and Webster. 

* Through Thursday morning

* The combination of a tropical airmass and a slow moving area of
  low pressure over Northern Georgia will set up the potential for
  very heavy localized rainfall late today into the overnight
  hours. This area of low pressure is forecast to drift south into
  Central Georgia overnight and has the potential focus storms 
  over a small area for several hours. Some high resolution 
  computer models are indicating the potential for this scenario 
  which could lead to flash flooding over localized areas. There 
  is no guarantee this will occur however given the potential and 
  the history of it occurring Tuesday night into Wednesday morning
  over Harris...Muscogee and Talbot Counties, a Flash Flood Watch
  is being issued.

* Potential exists for localized areas to receive an additional 4
  to 6 inches of rainfall in a short period of time...especially 
  during the overnight and into the early morning hours Thursday. 
  Any areas receiving these amounts of rainfall in a short period 
  of time could expect flash flooding of creeks an streams as well
  as the potential for flooded roads.
  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$
2 follow-up statements
780 
WGUS62 KFFC 240853
FFAFFC

Flood Watch
National Weather Service Peachtree City GA
453 AM EDT Thu May 24 2018


GAZ061-062-071>076-082>086-096>098-107>113-241000-
/O.CAN.KFFC.FF.A.0002.000000T0000Z-180524T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hancock-Warren-Monroe-Jones-Baldwin-Washington-Glascock-Jefferson-
Bibb-Twiggs-Wilkinson-Johnson-Emanuel-Bleckley-Laurens-Treutlen-
Pulaski-Wilcox-Dodge-Telfair-Wheeler-Montgomery-Toombs-
Including the cities of Milledgeville, Macon, Swainsboro, Dublin,
and Vidalia
453 AM EDT Thu May 24 2018

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for portions of central Georgia...east
central Georgia and southeast Georgia has been cancelled. Although
a few heavy rain showers will be possible this morning, the more
widespread rainfall remains to confined to counties west of this 
area.

$$

GAZ069-078>081-089>095-102>106-241500-
/O.CON.KFFC.FF.A.0002.000000T0000Z-180524T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Upson-Harris-Talbot-Taylor-Crawford-Muscogee-Chattahoochee-Marion-
Schley-Macon-Peach-Houston-Stewart-Webster-Sumter-Dooly-Crisp-
Including the cities of Columbus, Warner Robins, Lumpkin, 
Americus, and Cordele
453 AM EDT Thu May 24 2018

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 11 AM EDT THIS
MORNING...

The Flash Flood Watch continues for

* Portions of central Georgia and west central Georgia... 
  including the following areas...in central Georgia... 
  Crawford...Crisp...Dooly...Houston and Peach. In west central 
  Georgia...Chattahoochee...Harris...Macon...Marion...Muscogee...
   Schley...Stewart...Sumter...Talbot...Taylor...Upson and 
  Webster. 

* Until 11 AM EDT this morning

* The combination of a tropical airmass and a slow moving area of
  low pressure will continue the potential for very heavy
  localized rainfall through the morning hours. This area of low
  pressure is expected to linger across Central Georgia and has
  the potential to continue to focus storms over a small area for
  several hours. This may lead to flash flooding over localized 
  areas.
 
* Potential exists for localized areas to receive an additional 1
  to 2 inches of rainfall through the morning hours Thursday. Any
  areas receiving these amounts of rainfall in a short period of
  time could expect flash flooding of creeks and streams as well 
  as the potential for flooded roads. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$
363 
WGUS62 KFFC 241441
FFAFFC

Flood Watch
National Weather Service Peachtree City GA
1041 AM EDT Thu May 24 2018


GAZ069-078>081-089>095-102>106-241545-
/O.EXP.KFFC.FF.A.0002.000000T0000Z-180524T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Upson-Harris-Talbot-Taylor-Crawford-Muscogee-Chattahoochee-Marion-
Schley-Macon-Peach-Houston-Stewart-Webster-Sumter-Dooly-Crisp-
Including the cities of Columbus, Warner Robins, Lumpkin, 
Americus, and Cordele
1041 AM EDT Thu May 24 2018

...FLASH FLOOD WATCH WILL EXPIRE AT 11 AM EDT THIS MORNING...

The Flash Flood Watch for portions of central Georgia and west
central Georgia will expire at 11 AM EDT this morning. However, 
conditions will remain favorable for isolated areas of very heavy
rainfall and flash flooding this afternoon through the rest of the
week. Another Flash Flood Watch will likely be issued later today.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 23, 12:54 AM EDTSpecial Weather StatementFFCHarris, Muscogee36 min
May 23, 1:38 AM EDTSpecial Weather StatementFFCMuscogee37 min
May 23, 2:22 AM EDTFlash Flood WarningFFCHarris, Muscogee6 hr
May 23, 3:10 AM EDTSpecial Weather StatementFFCTalbot, Upson35 min
May 23, 3:48 AM EDTSpecial Weather StatementFFCTalbot, Upson27 min
May 23, 4:22 AM EDTSpecial Weather StatementFFCUpson23 min
May 23, 4:23 AM EDTSpecial Weather StatementFFCTalbot37 min
May 23, 5:17 AM EDTFlash Flood WarningFFCTalbot9 hr
May 23, 5:37 AM EDTRiver Flood WarningFFCGwinnett10 hr
May 23, 6:37 AM EDTFlash Flood WarningFFCHarris, Muscogee, Talbot8 hr
May 23, 6:57 AM EDTFlash Flood WarningFFCTalbot, Upson6 hr
May 23, 7:27 AM EDTRiver Flood WarningFFCChattahoochee, Muscogee7 hr
May 23, 8:28 AM EDTSpecial Weather StatementFFCChattahoochee, Marion, Muscogee, Schley, Taylor62 min
May 23, 8:50 AM EDTSpecial Weather StatementFFCClarke, Jackson, Madison55 min
May 23, 9:09 AM EDTFlash Flood WarningFFCChattahoochee, Marion, Muscogee, Talbot, Taylor6 hr
May 23, 10:23 AM EDTSpecial Weather StatementFFCChattahoochee, Marion, Schley67 min
May 23, 10:33 AM EDTRiver Flood WarningFFCCrawford, Talbot, Taylor, Upson42 hr
May 23, 10:39 AM EDTRiver Flood WarningFFCGwinnett2 hr
May 23, 11:27 AM EDTSpecial Weather StatementFFCMarion, Schley, Stewart, Webster48 min
May 23, 12:09 PM EDTSpecial Weather StatementFFCSumter51 min
May 23, 1:23 PM EDTSpecial Weather StatementFFCDodge, Laurens, Washington52 min
May 23, 2:47 PM EDTSpecial Weather StatementFFCWilcox43 min
May 23, 3:17 PM EDTSpecial Weather StatementFFCOglethorpe43 min
May 23, 3:27 PM EDTSpecial Weather StatementFFCJones48 min
May 23, 3:44 PM EDTSpecial Weather StatementFFCDodge31 min
May 23, 5:19 PM EDTSpecial Weather StatementFFCTalbot26 min
May 23, 6:44 PM EDTSpecial Weather StatementFFCTaliaferro31 min

Nearby

Flash Flood Watches in Georgia, 2018Every flash flood watch 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.