Alert archive / Georgia / Flash Flood Warnings in 2017

Flash Flood Warning 15, NWS Atlanta, GA

April 23, 2017Newton County, Rockdale County, Walton County, Georgia

NWS Atlanta, GA issued this flash flood warning at Apr 23, 2017, 5:48 PM EDT for Newton County, Rockdale County, Walton County, Georgia. It was in force for 4 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: Apr 23, 2017, 5:48 PM EDT (21:48 UTC)
Expired: Apr 23, 2017, 9:45 PM EDT
In force: 4 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties Newton County, GA, Rockdale County, GA, Walton County, GA

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.8 hours before the alert went out and 82 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: 60 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 772 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

759 
WGUS52 KFFC 232148
FFWFFC
GAC217-247-297-240145-
/O.NEW.KFFC.FF.W.0015.170423T2148Z-170424T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
548 PM EDT SUN APR 23 2017

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Rockdale County in north central Georgia...
  Walton County in north central Georgia...
  Northern Newton County in north central Georgia...

* Until 945 PM EDT

* At 546 PM EDT, Doppler radar indicated ongoing rainfall across the 
  warned area. Up to two inches of rain have already fallen. Flash 
  flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Conyers, Monroe, Covington, Loganville, Social Circle, Oxford,
  Porterdale, Walnut Grove, Between, Good Hope, Jersey, Lakeview
  Estates, Georgia International Horse Park, Windsor, Nicholasville,
  Big Haynes Creek Park, Pannell, Ebenezer, Bold Springs and Almon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 report at
NWSATLANTA.

&&

LAT...LON 3391 8376 3389 8376 3392 8368 3391 8364
      3389 8363 3388 8358 3387 8359 3385 8358
      3381 8351 3359 8369 3357 8368 3353 8368
      3361 8413 3362 8412 3362 8411 3372 8406
      3393 8380

$$

1 follow-up statement

475 
WGUS72 KFFC 240138
FFSFFC

Flash Flood Statement
National Weather Service Peachtree City GA
938 PM EDT SUN APR 23 2017

GAC217-247-297-240148-
/O.EXP.KFFC.FF.W.0015.000000T0000Z-170424T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Rockdale GA-Walton GA-Newton GA-
938 PM EDT SUN APR 23 2017

...THE FLASH FLOOD WARNING FOR ROCKDALE...WALTON AND NORTHERN NEWTON
COUNTIES WILL EXPIRE AT 945 PM EDT...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

LAT...LON 3391 8376 3389 8376 3392 8368 3391 8364
      3389 8363 3388 8358 3387 8359 3385 8358
      3381 8351 3359 8369 3357 8368 3353 8368
      3361 8413 3362 8412 3362 8411 3372 8406
      3393 8380

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 8:03 PM EDT	Special Weather Statement	FFC	Walker	27 min
Apr 23, 6:00 AM EDT	Special Weather Statement	FFC	Henry, Rockdale, Walton	45 min
Apr 23, 6:45 AM EDT	Special Weather Statement	FFC	Barrow, Clarke, Madison, Oconee, Rockdale, Walton	45 min
Apr 23, 11:31 AM EDT	River Flood Warning	FFC	Dade	30 hr
Apr 23, 2:29 PM EDT	Special Weather Statement	FFC	Morgan	31 min
Apr 23, 3:00 PM EDT	Special Weather Statement	FFC	Oconee	30 min
Apr 23, 4:04 PM EDT	Special Weather Statement	FFC	Rockdale, Walton	26 min
Apr 23, 4:15 PM EDT	Special Weather Statement	FFC	Jasper	30 min
Apr 23, 4:43 PM EDT	Special Weather Statement	FFC	Jasper	32 min
Apr 23, 4:45 PM EDT	Special Weather Statement	FFC	Macon	30 min
Apr 23, 5:07 PM EDT	Severe Thunderstorm Warning	FFC	Houston, Macon, Peach	23 min
Apr 23, 5:22 PM EDT	Special Weather Statement	FFC	Jones	23 min
Apr 23, 5:29 PM EDT	Severe Thunderstorm Warning	FFC	Bleckley, Houston, Peach, Twiggs	31 min
Apr 23, 5:30 PM EDT	Flash Flood Warning	FFC	Gwinnett	4 hr
Apr 23, 5:59 PM EDT	Special Weather Statement	FFC	Twiggs	31 min
Apr 23, 6:14 PM EDT	Severe Thunderstorm Warning	FFC	Twiggs, Wilkinson	31 min

Nearby

Flash Flood Warnings in Georgia, 2017 Every flash flood warning in 2017

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.