Alert archive / Georgia / Flash Flood Watches in 2021

Flash Flood Watch 3, NWS Atlanta, GA

March 17, 202114 counties in Georgia

NWS Atlanta, GA issued this flash flood watch at Mar 17, 2021, 5:51 PM EDT for 14 counties in Georgia. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Mar 17, 2021, 5:51 PM EDT (21:51 UTC)
Expired: Mar 18, 2021, 8:00 AM EDT
In force: 14 hr
Issued by: NWS Atlanta, GA
Flood severity: None

Counties Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Dade County, GA, Fannin County, GA, Floyd County, GA, Gilmer County, GA, Gordon County, GA, Murray County, GA, Pickens County, GA, Polk County, GA, Walker County, GA, Whitfield County, GA

The radar

The Northeast Alabama radar (KHTX), 114 km from the middle of the area, began a volume at 21:54 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, 9.9 hours before the alert went out and 138 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 466 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

676 
WGUS62 KFFC 172151
FFAFFC

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Peachtree City GA
551 PM EDT Wed Mar 17 2021

GAZ001>007-011>013-019>021-030-181200-
/O.NEW.KFFC.FF.A.0003.210317T2151Z-210318T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Dade-Walker-Catoosa-Whitfield-Murray-Fannin-Gilmer-Chattooga-Gordon-
Pickens-Floyd-Bartow-Cherokee-Polk-
Including the cities of , Cartersville, Rome, and Calhoun
551 PM EDT Wed Mar 17 2021

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

The National Weather Service in Peachtree City has issued a

* Flash Flood Watch for portions of north central Georgia and 
  northwest Georgia, including the following areas, in north central 
  Georgia, Cherokee, Fannin, Gilmer and Pickens. In northwest 
  Georgia, Bartow, Catoosa, Chattooga, Dade, Floyd, Gordon, Murray, 
  Polk, Walker and Whitfield.

* Through Thursday morning

* Significant rainfall expected for NW Georgia for the next 12 hours.

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.

&&

$$

1 follow-up statement

495 
WGUS62 KFFC 181217
FFAFFC

Flood Watch
National Weather Service Peachtree City GA
817 AM EDT Thu Mar 18 2021

GAZ001>007-011>013-019>021-030-181330-
/O.EXP.KFFC.FF.A.0003.000000T0000Z-210318T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Dade-Walker-Catoosa-Whitfield-Murray-Fannin-Gilmer-Chattooga-Gordon-
Pickens-Floyd-Bartow-Cherokee-Polk-
Including the cities of , Cartersville, Rome, and Calhoun
817 AM EDT Thu Mar 18 2021

...FLASH FLOOD WATCH HAS EXPIRED...

The Flash Flood Watch for portions of north central Georgia and 
northwest Georgia, including the following areas, in north central 
Georgia, Cherokee, Fannin, Gilmer and Pickens. In northwest Georgia, 
Bartow, Catoosa, Chattooga, Dade, Floyd, Gordon, Murray, Polk, 
Walker and Whitfield has expired.

The Flood Watch is expired. Although the threat of flash flooding 
has diminished, creeks and rivers continue to respond to high runoff 
rates. Please continue to heed remaining road closures.

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 16, 8:41 PM EDT	Special Weather Statement	FFC	Bibb, Twiggs, Wilkinson	34 min
Mar 16, 9:47 PM EDT	River Flood Warning	FFC	Gordon, Murray, Whitfield	5 days
Mar 17, 2:22 AM EDT	Dense Fog Advisory	FFC	Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 90 more	9 hr
Mar 17, 2:36 PM EDT	River Flood Warning	FFC	Whitfield	4 days
Mar 17, 3:21 PM EDT	River Flood Warning	FFC	Catoosa	62 hr
Mar 17, 4:45 PM EDT	Special Weather Statement	FFC	Dade	30 min
Mar 17, 5:26 PM EDT	Special Weather Statement	FFC	Schley, Webster	34 min
Mar 17, 5:41 PM EDT	Severe Thunderstorm Warning	FFC	Marion, Schley, Sumter, Webster	34 min
Mar 17, 6:07 PM EDT	Severe Thunderstorm Warning	FFC	Dooly, Macon, Schley, Sumter	38 min
Mar 17, 6:47 PM EDT	Special Weather Statement	FFC	Macon	28 min
Mar 17, 7:45 PM EDT	Special Weather Statement	FFC	Houston, Twiggs	30 min

Nearby

Flash Flood Watches in Georgia, 2021 Every flash flood watch in 2021

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.