Alert archive / Georgia / Flash Flood Warnings in 2021

Flash Flood Warning 38, NWS Tallahassee, FL

September 19, 2021Jefferson County, Florida; Brooks County, Thomas County, Georgia

NWS Tallahassee, FL issued this flash flood warning at Sep 19, 2021, 7:35 PM EDT for Jefferson County, Florida; Brooks County, Thomas County, Georgia. It was in force for 3 hr. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 19, 2021, 7:35 PM EDT (23:35 UTC)
Expired: Sep 19, 2021, 10:45 PM EDT
In force: 3 hr
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Flood severity: None

Counties Jefferson County, FL, Brooks County, GA, Thomas County, GA

The radar

The Tallahassee radar (KTLH), 62 km from the middle of the area, began a volume at 23:35 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.

What was reported inside it

Time	Report	Where	Remark
Sep 19, 8:35 PM EDT	FLASH FLOOD	Thomasville, GA	A FEW AREAS HAVE WATER OVER THE ROAD IN THOMASVILLE.
Sep 19, 8:35 PM EDT	FLASH FLOOD	Thomasville, GA	A FEW AREAS HAVE WATER OVER THE ROAD IN THOMASVILLE RESULTING IN CLOSURES.
Sep 19, 9:45 PM EDT	HEAVY RAIN 6.44	Thomasville, GA	MESONET STATION FW6964 THOMASVILLE, 2 DAY TOTAL.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 11.6 hours before the alert went out and 59 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: 320 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 554 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: -27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

370 
WGUS52 KTAE 192335
FFWTAE
FLC065-GAC027-275-200245-
/O.NEW.KTAE.FF.W.0038.210919T2335Z-210920T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tallahassee FL
735 PM EDT Sun Sep 19 2021

The National Weather Service in Tallahassee has issued a

* Flash Flood Warning for...
  Northeastern Jefferson County in Big Bend Florida...
  Southwestern Brooks County in south central Georgia...
  Southern Thomas County in south central Georgia...

* Until 1045 PM EDT.

* At 735 PM EDT, Doppler radar indicated heavy rain across the 
  warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Thomasville, Boston, Everett, Eason, Grooverville, Pidcock, 
  Newark, Dills, Oaklawn, Dixie, Metcalf and Ashville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3072 8408 3088 8408 3086 8364 3065 8357
      3065 8361 3058 8361 3057 8364 3055 8364
      3055 8367 3054 8367 3054 8370 3064 8383

FLASH FLOOD...RADAR INDICATED

$$

42-DVD

1 follow-up statement

131 
WGUS72 KTAE 200243
FFSTAE

Flash Flood Statement
National Weather Service Tallahassee FL
1043 PM EDT Sun Sep 19 2021

FLC065-GAC027-275-200253-
/O.EXP.KTAE.FF.W.0038.000000T0000Z-210920T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson FL-Brooks GA-Thomas GA-
1043 PM EDT Sun Sep 19 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1045 PM EDT THIS EVENING FOR 
NORTHEASTERN JEFFERSON, SOUTHWESTERN BROOKS AND SOUTHERN THOMAS 
COUNTIES...

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

A Flash Flood Watch remains in effect until 800 AM EDT Monday for 
portions of southeast Alabama, Florida and Georgia.

LAT...LON 3072 8408 3088 8408 3086 8364 3065 8357
      3065 8361 3058 8361 3057 8364 3055 8364
      3055 8367 3054 8367 3054 8370 3064 8383

$$

The office that day

Everything else NWS Tallahassee, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 19, 3:50 AM EDT	Rip Current Statement	TAE	Bay, Gulf, Walton	22 hr
Sep 19, 6:13 AM EDT	Special Marine Warning	TAE		92 min
Sep 19, 7:27 AM EDT	Special Marine Warning	TAE		48 min
Sep 19, 12:21 PM EDT	Special Marine Warning	TAE		24 min
Sep 19, 2:07 PM EDT	Flash Flood Watch	TAE	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 10 more	13 hr
Sep 19, 3:52 PM EDT	Areal Flood Advisory	TAE	Franklin, Gulf, Liberty	3 hr
Sep 19, 4:48 PM EDT	Areal Flood Advisory	TAE	Bay	57 min
Sep 19, 6:06 PM EDT	Areal Flood Advisory	TAE	Lafayette	114 min
Sep 18, 9:31 PM EDT	Areal Flood Advisory	TAE	Dougherty, Lee, Terrell	3 hr
Sep 18, 10:43 PM EDT	Areal Flood Advisory	TAE	Turner, Worth	3 hr
Sep 19, 2:51 PM EDT	Special Weather Statement	TAE	Baker, Calhoun, Terrell	39 min
Sep 19, 6:30 PM EDT	Areal Flood Advisory	TAE	Brooks	2 hr

Nearby

Flash Flood Warnings in Georgia, 2021 Flash Flood Warnings in Florida, 2021 Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.