Alert archive / Georgia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 29, NWS Jacksonville, FL

April 10, 2021Camden County, Glynn County, Georgia; Duval County, Nassau County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 10, 2021, 4:44 PM EDT for Camden County, Glynn County, Georgia; Duval County, Nassau County, Florida. It was in force for 34 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
Apr 10, 2021, 4:44 PM EDT (20:44 UTC)
Expired
Apr 10, 2021, 5:18 PM EDT
In force
34 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Duval County, FL, Nassau County, FL, Camden County, GA, Glynn County, GA

The radar

The Jacksonville radar (KJAX), 30 km from the middle of the area, began a volume at 20:43 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.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 8.7 hours before the alert went out and 28 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-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2021-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 159 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2021-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
159 J/kg
Mixed-layer CIN
-225 J/kg
Mixed-layer LCL
965 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

633 
WUUS52 KJAX 102044
SVRJAX
FLC031-089-GAC039-127-102130-
/O.NEW.KJAX.SV.W.0029.210410T2044Z-210410T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
444 PM EDT Sat Apr 10 2021

The National Weather Service in Jacksonville has issued a

* Severe Thunderstorm Warning for...
  Northeastern Nassau County in northeastern Florida...
  Northeastern Duval County in northeastern Florida...
  Camden County in southeastern Georgia...
  South central Glynn County in southeastern Georgia...

* Until 530 PM EDT.

* At 444 PM EDT, a severe thunderstorm was located over Woodbine,
  moving northeast at 45 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  St. Marys, Kingsland, Brunswick, Fernandina Beach, Woodbine,
  Jacksonville International Arpt, Kings Bay Base, Yulee, Oceanway
  and Nassau Village-Ratliff.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3039 8179 3099 8182 3119 8144 3093 8140
      3077 8142 3047 8138
TIME...MOT...LOC 2044Z 235DEG 37KT 3096 8168 

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

KB
2 follow-up statements
644 
WWUS52 KJAX 102104
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
504 PM EDT Sat Apr 10 2021

FLC031-089-GAC039-127-102130-
/O.CON.KJAX.SV.W.0029.000000T0000Z-210410T2130Z/
Nassau FL-Duval FL-Camden GA-Glynn GA-
504 PM EDT Sat Apr 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR NORTHEASTERN NASSAU...NORTHEASTERN DUVAL...EASTERN CAMDEN AND
SOUTH CENTRAL GLYNN COUNTIES...

At 504 PM EDT, a severe thunderstorm was located near Jekyll Island,
or near Brunswick, moving northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
St. Marys, Brunswick, Fernandina Beach, Kings Bay Base, Yulee,
Cumberland Island, Harrietts Bluff and Dover Bluff.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3047 8138 3044 8161 3108 8165 3119 8144
      3093 8140 3077 8142
TIME...MOT...LOC 2104Z 235DEG 37KT 3106 8151 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

KB
039 
WWUS52 KJAX 102118
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
518 PM EDT Sat Apr 10 2021

FLC031-089-GAC039-127-102128-
/O.CAN.KJAX.SV.W.0029.000000T0000Z-210410T2130Z/
Nassau FL-Duval FL-Camden GA-Glynn GA-
518 PM EDT Sat Apr 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NASSAU...
NORTHEASTERN DUVAL...EASTERN CAMDEN AND SOUTH CENTRAL GLYNN COUNTIES
IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

LAT...LON 3047 8138 3044 8161 3108 8165 3119 8144
      3093 8140 3077 8142
TIME...MOT...LOC 2117Z 235DEG 37KT 3114 8137 

$$

NGUYEN

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 10, 2:33 AM EDTRip Current StatementJAXCamden, Glynn17 hr
Apr 10, 1:41 PM EDTSpecial Weather StatementJAXAtkinson, Clinch, Echols64 min
Apr 10, 2:13 PM EDTSevere Thunderstorm WarningJAXClinch47 min
Apr 10, 2:18 PM EDTSevere Thunderstorm WarningJAXClinch, Echols42 min
Apr 10, 2:45 PM EDTSpecial Weather StatementJAXClinch, Echols, Ware60 min
Apr 10, 2:59 PM EDTSevere Thunderstorm WarningJAXClinch, Echols46 min
Apr 10, 3:34 PM EDTSpecial Weather StatementJAXCharlton, Pierce, Ware56 min
Apr 10, 4:08 PM EDTSpecial Weather StatementJAXBrantley, Camden, Wayne67 min
Apr 10, 4:39 PM EDTSpecial Weather StatementJAXCamden, Glynn51 min
Apr 10, 4:49 PM EDTTornado WarningJAXCamden, Glynn26 min
Apr 10, 2:30 AM EDTSmall Craft AdvisoryJAX24 hr
Apr 10, 3:34 PM EDTSpecial Weather StatementJAXAlachua, Bradford, Marion, Union56 min
Apr 10, 4:14 PM EDTSpecial Marine WarningJAX61 min
Apr 10, 4:29 PM EDTSpecial Weather StatementJAXBradford, Clay, Duval, Putnam61 min
Apr 10, 4:57 PM EDTSpecial Weather StatementJAXDuval33 min
Apr 10, 4:58 PM EDTSpecial Marine WarningJAX2 hr
Apr 10, 5:12 PM EDTSpecial Marine WarningJAX111 min
Apr 10, 5:15 PM EDTSpecial Weather StatementJAXFlagler, Putnam, Saint Johns60 min
Apr 10, 5:15 PM EDTSpecial Weather StatementJAXFlagler, Putnam, Saint Johns60 min
Apr 10, 6:11 PM EDTSpecial Marine WarningJAX2 hr
Apr 10, 7:08 PM EDTSpecial Marine WarningJAX67 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2021Severe Thunderstorm Warnings in Florida, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.