Alert archive / Georgia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 76, NWS Jacksonville, FL

May 12, 20214 counties in Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at May 12, 2021, 2:44 PM EDT for 4 counties in Georgia. It was in force for 47 min. 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: May 12, 2021, 2:44 PM EDT (18:44 UTC)
Expired: May 12, 2021, 3:31 PM EDT
In force: 47 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Brantley County, GA, Camden County, GA, Glynn County, GA, Wayne County, GA

The radar

The Jacksonville radar (KJAX), 91 km from the middle of the area, began a volume at 18:43 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
May 12, 2:45 PM EDT	TSTM WND GST 43	6 Wnw Thalmann, GA	ALSO REPORTED NICKEL SIZE HAIL.
May 12, 2:45 PM EDT	HAIL 0.88	6 Wnw Thalmann, GA
May 12, 3:10 PM EDT	TSTM WND DMG	2 Ene Boys Estate, GA	A COUPLE OF TREES DOWN NEAR HWY 17 N. TIME ESTIMATED BY RADAR.

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

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 6.7 hours before the alert went out and 90 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: 299 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 809 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

As transmitted.

720 
WUUS52 KJAX 121844
SVRJAX
GAC025-039-127-305-121945-
/O.NEW.KJAX.SV.W.0076.210512T1844Z-210512T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
244 PM EDT Wed May 12 2021

The National Weather Service in Jacksonville has issued a

* Severe Thunderstorm Warning for...
  North central Camden County in southeastern Georgia...
  Glynn County in southeastern Georgia...
  Northeastern Brantley County in southeastern Georgia...
  Southeastern Wayne County in southeastern Georgia...

* Until 345 PM EDT.

* At 244 PM EDT, a severe thunderstorm was located near Waynesville,
  or 9 miles northeast of Nahunta, moving east at 30 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Brunswick, St. Simons Island, Dock Junction, Country Club Estates,
  Thalmann, Sea Island, Everett, Waynesville, Atkinson and Mount
  Pleasant.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3119 8125 3109 8137 3111 8158 3117 8188
      3145 8175 3144 8161 3138 8155 3133 8147
      3133 8144 3131 8144 3128 8139 3129 8139
      3128 8138 3130 8137 3131 8134 3128 8132
      3128 8125 3121 8124
TIME...MOT...LOC 1844Z 266DEG 26KT 3128 8185 

HAIL...0.75IN
WIND...60MPH
 
$$

SHASHY

2 follow-up statements

893 
WWUS52 KJAX 121907
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
307 PM EDT Wed May 12 2021

GAC025-039-305-121915-
/O.CAN.KJAX.SV.W.0076.000000T0000Z-210512T1945Z/
Camden GA-Brantley GA-Wayne GA-
307 PM EDT Wed May 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL CAMDEN...
NORTHEASTERN BRANTLEY AND SOUTHEASTERN WAYNE COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3119 8125 3109 8137 3111 8156 3113 8157
      3112 8158 3112 8159 3119 8177 3133 8173
      3137 8170 3144 8161 3138 8155 3133 8147
      3133 8144 3131 8144 3128 8139 3131 8134
      3128 8132 3128 8125 3121 8124
TIME...MOT...LOC 1905Z 278DEG 32KT 3126 8160 

$$

GAC127-121945-
/O.CON.KJAX.SV.W.0076.000000T0000Z-210512T1945Z/
Glynn GA-
307 PM EDT Wed May 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR GLYNN COUNTY...

At 305 PM EDT, a severe thunderstorm was located near Thalmann, or
near Dock Junction, moving east at 35 mph.

HAZARD...60 mph wind gusts and nickel size hail.

SOURCE...Radar indicated. At 245 PM, nickel size hail was reported 
         in northern Brantley county.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Brunswick, St. Simons Island, Dock Junction, Country Club Estates,
Thalmann, Sea Island, Everett and Boys Estate.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3119 8125 3109 8137 3111 8156 3113 8157
      3112 8158 3112 8159 3119 8177 3133 8173
      3137 8170 3144 8161 3138 8155 3133 8147
      3133 8144 3131 8144 3128 8139 3131 8134
      3128 8132 3128 8125 3121 8124
TIME...MOT...LOC 1905Z 278DEG 32KT 3126 8160 

HAIL...0.88IN
WIND...60MPH
 
$$

SHASHY

342 
WWUS52 KJAX 121931
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
331 PM EDT Wed May 12 2021

GAC127-121940-
/O.CAN.KJAX.SV.W.0076.000000T0000Z-210512T1945Z/
Glynn GA-
331 PM EDT Wed May 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR GLYNN COUNTY IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has 
been cancelled.  However gusty winds are still possible.

LAT...LON 3119 8125 3109 8137 3111 8156 3113 8157
      3112 8158 3112 8159 3119 8177 3133 8173
      3137 8170 3144 8161 3138 8155 3133 8147
      3133 8144 3131 8144 3128 8139 3131 8134
      3128 8132 3128 8125 3121 8124
TIME...MOT...LOC 1925Z 266DEG 26KT 3127 8138 

$$

SHASHY

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 10:24 PM EDT	Special Weather Statement	JAX	Jeff Davis	51 min
May 11, 10:47 PM EDT	Special Weather Statement	JAX	Jeff Davis	43 min
May 12, 12:20 PM EDT	Special Weather Statement	JAX	Coffee	55 min
May 12, 1:06 PM EDT	Special Weather Statement	JAX	Appling, Bacon	54 min
May 12, 2:02 PM EDT	Special Weather Statement	JAX	Brantley, Pierce, Wayne	43 min
May 12, 2:14 PM EDT	Severe Thunderstorm Warning	JAX	Brantley, Glynn, Pierce, Ware, Wayne	46 min
May 12, 2:39 PM EDT	Special Weather Statement	JAX	Brantley	51 min
May 12, 2:50 PM EDT	Severe Thunderstorm Warning	JAX	Clinch, Echols, Ware	55 min
May 12, 3:30 PM EDT	Special Weather Statement	JAX	Camden	30 min
May 12, 3:42 PM EDT	Special Weather Statement	JAX	Charlton	48 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2021 Every severe thunderstorm 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.