Alert archive / Georgia / Flash Flood Warnings in 2015

Flash Flood Warning 20, NWS Atlanta, GA

August 19, 2015Douglas County, Fulton County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 19, 2015, 6:14 PM EDT for Douglas County, Fulton 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: Aug 19, 2015, 6:14 PM EDT (22:14 UTC)
Expired: Aug 20, 2015, 12:15 AM EDT
In force: 6 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties Douglas County, GA, Fulton County, GA

The radar

The Atlanta radar (KFFC), 39 km from the middle of the area, began a volume at 22:18 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, 10.2 hours before the alert went out and 40 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 323 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 988 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

624 
WGUS52 KFFC 192214
FFWFFC
GAC097-121-200415-
/O.NEW.KFFC.FF.W.0020.150819T2214Z-150820T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
614 PM EDT WED AUG 19 2015

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL DOUGLAS COUNTY IN NORTH CENTRAL GEORGIA...
  SOUTHWESTERN FULTON COUNTY IN NORTH CENTRAL GEORGIA...

* UNTIL 1215 AM EDT THURSDAY
    
* AT 612 PM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO THREE INCHES OF RAIN HAVE 
  ALREADY FALLEN...AND AN ADDITIONAL INCH OR MORE OF RAIN IS 
  POSSIBLE THROUGH 645 PM EDT. FLASH FLOODING IS EXPECTED TO BEGIN 
  SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  SANDTOWN AND CAMPBELLTON. 

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...CROOKED CREEK... 
ANNEEWAKEE CREEK...CAMP CREEK...SWEETWATER CREEK...DRY CREEK...WOLF 
CREEK AND DEEP CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

DO NOT ENTER OR CROSS FLOWING WATER OR WATER OF UNKNOWN DEPTH. 

IF YOU SEE SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6 OR TWEET US YOUR WARNING AT
NWSATLANTA.

&&

LAT...LON 3375 8464 3374 8458 3376 8455 3372 8451
      3365 8453 3365 8470 3371 8471

$$

1 follow-up statement

669 
WGUS72 KFFC 200114
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
914 PM EDT WED AUG 19 2015

GAC097-121-200118-
/O.CAN.KFFC.FF.W.0020.000000T0000Z-150820T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DOUGLAS GA-FULTON GA-
914 PM EDT WED AUG 19 2015

...THE FLASH FLOOD WARNING FOR EAST CENTRAL DOUGLAS AND SOUTHWESTERN
FULTON COUNTIES IS CANCELLED...

DOPPLER RADAR ESTIMATES INDICATE 3.5 TO 4 INCHES OF RAIN FELL OVER 
THIS AREA EARLIER...HOWEVER THE HEAVY RAIN HAS ENDED AND FLOODING IS 
NO LONGER EXPECTED TO POSE A THREAT. NO REPORTS OF FLASH FLOODING 
HAVE BEEN RECEIVED BUT SMALL CREEKS AND STREAMS ARE LIKELY TO REMAIN 
AT OR NEAR BANKFULL THROUGH THE EVENING. 

LAT...LON 3375 8464 3374 8458 3376 8455 3372 8451
      3365 8453 3365 8470 3371 8471

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 8:36 PM EDT	Special Weather Statement	FFC	Coweta, Fayette	39 min
Aug 18, 11:52 PM EDT	Areal Flood Warning	FFC	Morgan, Oconee	4 hr
Aug 19, 12:07 AM EDT	River Flood Warning	FFC	Gwinnett, Walton	7 days
Aug 19, 12:10 PM EDT	Special Weather Statement	FFC	Bartow, Floyd, Gordon	35 min
Aug 19, 2:09 PM EDT	Special Weather Statement	FFC	Clarke, Oconee	51 min
Aug 19, 2:54 PM EDT	Special Weather Statement	FFC	Morgan, Oconee	51 min
Aug 19, 3:19 PM EDT	Special Weather Statement	FFC	Banks, Hall	41 min
Aug 19, 3:53 PM EDT	Special Weather Statement	FFC	Barrow	52 min
Aug 19, 4:44 PM EDT	Special Weather Statement	FFC	Hancock, Warren	46 min
Aug 19, 4:48 PM EDT	Special Weather Statement	FFC	DeKalb, Rockdale	42 min
Aug 19, 4:51 PM EDT	Special Weather Statement	FFC	Bartow, Cherokee	39 min
Aug 19, 5:09 PM EDT	Special Weather Statement	FFC	Douglas	51 min
Aug 19, 5:31 PM EDT	Special Weather Statement	FFC	Warren	44 min
Aug 19, 5:35 PM EDT	Special Weather Statement	FFC	Barrow	40 min
Aug 19, 5:53 PM EDT	Special Weather Statement	FFC	Fulton	52 min
Aug 19, 6:00 PM EDT	Special Weather Statement	FFC	Gilmer, Gordon, Murray	45 min
Aug 19, 6:02 PM EDT	Flash Flood Warning	FFC	Carroll	6 hr
Aug 19, 6:22 PM EDT	Special Weather Statement	FFC	Cherokee, Dawson, Forsyth	38 min
Aug 19, 6:48 PM EDT	Special Weather Statement	FFC	Chattooga, Gordon	42 min
Aug 19, 7:33 PM EDT	Special Weather Statement	FFC	Murray, Whitfield	57 min

Nearby

Flash Flood Warnings in Georgia, 2015 Every flash flood warning in 2015

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.