Alert archive / Georgia / Flash Flood Warnings in 2014

Flash Flood Warning 18, NWS Atlanta, GA

July 11, 2014Jackson County, Madison County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jul 11, 2014, 10:55 PM EDT for Jackson County, Madison County, 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
Jul 11, 2014, 10:55 PM EDT (02:55 UTC)
Expired
Jul 12, 2014, 4:45 AM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties Jackson County, GA, Madison County, GA

The radar

The Greer radar (KGSP), 123 km from the middle of the area, began a volume at 02:56 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, 2.9 hours before the alert went out and 146 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 2014-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 503 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2014-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -29 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
503 J/kg
Mixed-layer CIN
-74 J/kg
Mixed-layer LCL
1357 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-29 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, in the capitals the NWS used until 2016.

019 
WGUS52 KFFC 120255
FFWFFC
GAC157-195-120845-
/O.NEW.KFFC.FF.W.0018.140712T0255Z-140712T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1055 PM EDT FRI JUL 11 2014

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN JACKSON COUNTY IN NORTHEAST GEORGIA
  MADISON COUNTY IN NORTHEAST GEORGIA

* UNTIL 445 AM EDT

* AT 1048 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
  POTENTIAL FLASH FLOODING FROM THUNDERSTORMS WITH HEAVY RAIN OVER   
  THE WARNED AREA NEAR THE JACKSON AND MADISON COUNTY LINE.          
  ESTIMATED RAINFALL AMOUNTS OF 3 TO 4 INCHES HAVE OCCURRED IN LESS
  THAN 3 HOURS IN THE SANDY CREEK...BLACK CREEK AND THE UPPER REACHES
  OF THE SOUTH FORK BROAD RIVER. 

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3407 8312 3404 8346 3424 8345 3420 8341
      3420 8338 3425 8333 3426 8328 3425 8325
      3425 8319 3425 8316 3427 8313

$$


16
1 follow-up statement
871 
WGUS72 KFFC 120606
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
206 AM EDT SAT JUL 12 2014

GAC157-195-120615-
/O.CAN.KFFC.FF.W.0018.000000T0000Z-140712T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MADISON GA-JACKSON GA-
206 AM EDT SAT JUL 12 2014

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EASTERN JACKSON AND
MADISON COUNTIES...

HEAVY RAIN HAS ENDED AND WATER LEVELS ARE BEGINNING TO RECEDE... 
THEREOFRE THE THREAT OF FLASH FLOODING HAS DIMINISHED. WATER LEVELS 
ON LARGER CREEKS AND STREAMS WILL CONTINUE TO REMAIN HIGH HOWEVER... 
AS RUNOFF CONTINUES. DO NOT EXPLORE OR PLAY IN AREAS OF HIGH WATER. 

IF YOU SAW 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 3407 8312 3404 8346 3424 8345 3420 8341
      3420 8338 3425 8333 3426 8328 3425 8325
      3425 8319 3425 8316 3427 8313

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 8:12 PM EDTSpecial Weather StatementFFCButts33 min
Jul 11, 8:20 PM EDTSpecial Weather StatementFFCBarrow, Clarke, Jackson, Oconee25 min
Jul 11, 8:28 PM EDTSpecial Weather StatementFFCHall32 min
Jul 11, 9:19 PM EDTSpecial Weather StatementFFCBanks, Clarke, Hall, Jackson26 min
Jul 11, 9:47 PM EDTSpecial Weather StatementFFCBanks, Jackson28 min
Jul 12, 4:05 PM EDTSpecial Weather StatementFFCUnion25 min
Jul 12, 5:28 PM EDTSpecial Weather StatementFFCWilkinson32 min
Jul 12, 7:02 PM EDTSpecial Weather StatementFFCTelfair28 min

Nearby

Flash Flood Warnings in Georgia, 2014Every flash flood warning in 2014

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.