Alert archive / Georgia / Flash Flood Warnings in 2017

Flash Flood Warning 49, NWS Atlanta, GA

October 9, 2017Troup County, Georgia

NWS Atlanta, GA issued this flash flood warning at Oct 9, 2017, 8:18 AM EDT for Troup 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: Oct 9, 2017, 8:18 AM EDT (12:18 UTC)
Expired: Oct 9, 2017, 2:15 PM EDT
In force: 6 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

County Troup County, GA

The radar

The Atlanta radar (KFFC), 63 km from the middle of the area, began a volume at 12:20 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

Birmingham, AL (KBMX), launched 12:00Z, 0.3 hours before the alert went out and 159 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: 496 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 526 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

382 
WGUS52 KFFC 091218
FFWFFC
GAC285-091815-
/O.NEW.KFFC.FF.W.0049.171009T1218Z-171009T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
818 AM EDT MON OCT 9 2017

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Central Troup County in west central Georgia...

* Until 215 PM EDT

* At 817 AM EDT, National Weather Service meteorologists estimated 
  that 1 to 4 inches of rain has fallen across parts of southwest 
  Troup County. An additional 1 to 2 inches of rain will be possible 
  in the warned area over the next few hours. Flash flooding is 
  expected to begin shortly.

* Some locations that will experience flooding include...
  Lagrange, West Point, Hogansville, Mountville, Cannonville, Big
  Springs, Louise, Abbottsford, Smiths Crossroad and Long Cane.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.

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 3304 8520 3317 8488 3297 8486 3287 8519
      3289 8519

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 9, 6:05 AM EDT	Special Weather Statement	FFC	Troup	40 min
Oct 9, 6:06 AM EDT	Special Weather Statement	FFC	Spalding	39 min
Oct 9, 6:50 AM EDT	Special Weather Statement	FFC	Troup	40 min
Oct 9, 6:53 AM EDT	Special Weather Statement	FFC	Spalding	52 min
Oct 9, 7:35 AM EDT	Special Weather Statement	FFC	Coweta, Fayette	40 min
Oct 9, 8:25 AM EDT	Special Weather Statement	FFC	Fayette, Henry	65 min
Oct 9, 9:19 AM EDT	Special Weather Statement	FFC	Lamar, Monroe	26 min
Oct 9, 9:24 AM EDT	Special Weather Statement	FFC	Coweta	36 min
Oct 9, 9:40 AM EDT	Special Weather Statement	FFC	Meriwether, Pike	35 min
Oct 9, 10:11 AM EDT	Special Weather Statement	FFC	Butts, Henry, Lamar, Pike, Spalding	49 min
Oct 9, 11:00 AM EDT	Special Weather Statement	FFC	Lamar, Monroe	45 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; radar from the NEXRAD Level II archive.