Alert archive / Georgia / Flash Flood Warnings in 2021

Flash Flood Warning 5, NWS Jacksonville, FL

July 7, 2021Glynn County, Georgia

NWS Jacksonville, FL issued this flash flood warning at Jul 7, 2021, 7:53 PM EDT for Glynn County, Georgia. It was in force for 78 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 7, 2021, 7:53 PM EDT (23:53 UTC)
Expired: Jul 7, 2021, 9:11 PM EDT
In force: 78 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Flood severity: None

County Glynn County, GA

The radar

The Jacksonville radar (KJAX), 93 km from the middle of the area, began a volume at 23:55 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

Jacksonville, FL (KJAX), launched 12:00Z, 11.9 hours before the alert went out and 91 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: 1540 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 838 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

061 
WGUS52 KJAX 072353
FFWJAX
GAC127-080200-
/O.NEW.KJAX.FF.W.0005.210707T2353Z-210708T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jacksonville FL
753 PM EDT Wed Jul 7 2021

The National Weather Service in Jacksonville has issued a

* Flash Flood Warning for...
  Central Glynn County in southeastern Georgia...

* Until 1000 PM EDT.

* At 753 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 3 and 6 inches of rain 
  have fallen. Additional rainfall amounts of 2 to 3 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  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...
  Brunswick, Dock Junction, Country Club Estates and Boys Estate.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3137 8161 3139 8156 3133 8147 3134 8147
      3133 8145 3133 8144 3131 8144 3131 8142
      3128 8139 3129 8138 3130 8137 3129 8137
      3130 8134 3122 8141 3123 8145 3114 8154
      3117 8161

FLASH FLOOD...RADAR INDICATED

$$

HESS

1 follow-up statement

062 
WGUS72 KJAX 080111
FFSJAX

Flash Flood Statement
National Weather Service Jacksonville FL
911 PM EDT Wed Jul 7 2021

GAC127-080121-
/O.CAN.KJAX.FF.W.0005.000000T0000Z-210708T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Glynn GA-
911 PM EDT Wed Jul 7 2021

...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL GLYNN COUNTY...

The heavy rain has ended. Please continue to heed remaining road 
closures.

A Flood Watch remains in effect until 200 AM EDT for portions of 
Florida and southeast Georgia.

LAT...LON 3137 8161 3139 8156 3133 8147 3134 8147
      3133 8145 3133 8144 3131 8144 3131 8142
      3128 8139 3129 8138 3130 8137 3129 8137
      3130 8134 3122 8141 3123 8145 3114 8154
      3117 8161

$$

HESS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 11:03 PM EDT	Rip Current Statement	JAX	Camden, Glynn	28 hr
Jul 7, 2:52 AM EDT	High Surf Advisory	JAX	Camden, Glynn	13 hr
Jul 7, 8:31 AM EDT	Special Weather Statement	JAX	Echols	44 min
Jul 7, 9:01 AM EDT	Special Weather Statement	JAX	Atkinson	44 min
Jul 7, 9:17 AM EDT	Special Weather Statement	JAX	Echols	58 min
Jul 7, 9:37 AM EDT	Tornado Warning	JAX	Brantley, Pierce, Ware	23 min
Jul 7, 10:03 AM EDT	Special Weather Statement	JAX	Coffee	42 min
Jul 7, 10:14 AM EDT	Special Weather Statement	JAX	Clinch	46 min
Jul 7, 10:19 AM EDT	Special Weather Statement	JAX	Camden	41 min
Jul 7, 10:55 AM EDT	Special Weather Statement	JAX	Atkinson, Bacon, Brantley, Coffee, Pierce	65 min
Jul 7, 12:09 PM EDT	Special Weather Statement	JAX	Appling, Jeff Davis	36 min
Jul 7, 1:38 PM EDT	Areal Flood Warning	JAX	Charlton, Clinch, Echols, Ware	3 hr
Jul 7, 2:47 PM EDT	Special Weather Statement	JAX	Charlton	58 min
Jul 7, 3:31 PM EDT	Areal Flood Warning	JAX	Camden, Charlton, Clinch, Ware	2 hr
Jul 7, 3:45 PM EDT	Special Weather Statement	JAX	Camden, Charlton	60 min
Jul 7, 4:45 PM EDT	Special Weather Statement	JAX	Brantley, Camden, Charlton, Glynn, Pierce, Ware	60 min
Jul 7, 5:15 PM EDT	Areal Flood Warning	JAX	Brantley, Camden, Charlton, Glynn, Pierce, Ware	2 hr
Jul 7, 5:42 PM EDT	Tornado Warning	JAX	Camden	33 min
Jul 7, 5:45 PM EDT	Special Weather Statement	JAX	Brantley, Camden, Glynn, Wayne	60 min
Jul 7, 6:11 PM EDT	Tornado Warning Tornado observed	JAX	Camden, Glynn, Wayne	21 min
Jul 7, 6:17 PM EDT	Areal Flood Warning	JAX	Appling, Brantley, Camden, Glynn, Pierce, Wayne	3 hr
Jul 7, 6:46 PM EDT	Special Weather Statement	JAX	Camden, Glynn, Wayne	44 min
Jul 7, 7:01 PM EDT	Flash Flood Warning	JAX	Camden, Glynn	119 min
Jul 7, 7:18 PM EDT	Areal Flood Warning	JAX	Brantley, Camden, Charlton, Glynn, Pierce, Ware	117 min

Nearby

Flash Flood Warnings in Georgia, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.