Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 84, NWS Jacksonville, FL

June 12, 20215 counties in Florida; 5 counties in Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 12, 2021, 4:10 PM EDT for 5 counties in Florida; 5 counties in Georgia. It was in force for 25 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
Jun 12, 2021, 4:10 PM EDT (20:10 UTC)
Expired
Jun 12, 2021, 4:35 PM EDT
In force
25 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Baker County, FL, Columbia County, FL, Hamilton County, FL, Nassau County, FL, Union County, FL, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Ware County, GA

The radar

The Moody AFB radar (KVAX), 60 km from the middle of the area, began a volume at 20:10 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, 8.2 hours before the alert went out and 88 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 2021-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 467 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 2021-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 square meters per square second.1939Sfc1 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
467 J/kg
Mixed-layer CIN
-102 J/kg
Mixed-layer LCL
1010 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
64 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

686 
WUUS52 KJAX 122010
SVRJAX
FLC003-023-047-089-125-GAC039-049-065-101-299-122100-
/O.NEW.KJAX.SV.W.0084.210612T2010Z-210612T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
410 PM EDT Sat Jun 12 2021

The National Weather Service in Jacksonville has issued a

* Severe Thunderstorm Warning for...
  Northwestern Nassau County in northeastern Florida...
  Baker County in northeastern Florida...
  Northeastern Union County in northern Florida...
  Northern Columbia County in northern Florida...
  Southeastern Hamilton County in northern Florida...
  Southwestern Camden County in southeastern Georgia...
  Southeastern Echols County in southeastern Georgia...
  Southeastern Ware County in southeastern Georgia...
  Southeastern Clinch County in southeastern Georgia...
  Charlton County in southeastern Georgia...

* Until 500 PM EDT.

* At 410 PM EDT, severe thunderstorms were located along a line
  extending from 8 miles northwest of Stephen Foster State Park to
  near White Springs, moving east at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Hilliard, Folkston, White Springs, Fargo, Raiford, Stephen Foster
  State Park, Taylor, Macclenny, Homeland and Glen St. Mary.

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 these storms. 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 3096 8242 3086 8166 3005 8225 3029 8280
      3035 8280 3034 8281 3035 8283 3034 8284
      3036 8286 3036 8287 3037 8288
TIME...MOT...LOC 2010Z 271DEG 23KT 3091 8244 3039 8282 

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

HESS
2 follow-up statements
235 
WWUS52 KJAX 122023
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
423 PM EDT Sat Jun 12 2021

GAC039-065-101-122033-
/O.CAN.KJAX.SV.W.0084.000000T0000Z-210612T2100Z/
Camden GA-Echols GA-Clinch GA-
423 PM EDT Sat Jun 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CAMDEN...
SOUTHEASTERN ECHOLS AND SOUTHEASTERN CLINCH COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3037 8288 3058 8247 3058 8242 3061 8242
      3075 8215 3070 8178 3005 8225 3029 8280
      3034 8280 3034 8284
TIME...MOT...LOC 2023Z 271DEG 23KT 3091 8238 3039 8276 

$$

FLC003-023-047-089-125-GAC049-299-122100-
/O.CON.KJAX.SV.W.0084.000000T0000Z-210612T2100Z/
Nassau FL-Baker FL-Union FL-Columbia FL-Hamilton FL-Ware GA-
Charlton GA-
423 PM EDT Sat Jun 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR NORTHWESTERN NASSAU...BAKER...NORTHEASTERN UNION...NORTHERN
COLUMBIA...SOUTHEASTERN HAMILTON...SOUTHEASTERN WARE AND SOUTHEASTERN
CHARLTON COUNTIES...

At 423 PM EDT, severe thunderstorms were located along a line
extending from 6 miles north of Stephen Foster State Park to near
White Springs, moving east at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Hilliard, White Springs, Raiford, Taylor, Macclenny, Glen St. Mary,
Winfield, Olustee, Suwannee Valley and St. George.

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 these storms.
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 3037 8288 3058 8247 3058 8242 3061 8242
      3075 8215 3070 8178 3005 8225 3029 8280
      3034 8280 3034 8284
TIME...MOT...LOC 2023Z 271DEG 23KT 3091 8238 3039 8276 

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

HESS
339 
WWUS52 KJAX 122035
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
435 PM EDT Sat Jun 12 2021

FLC003-023-047-089-125-GAC049-299-122045-
/O.CAN.KJAX.SV.W.0084.000000T0000Z-210612T2100Z/
Nassau FL-Baker FL-Union FL-Columbia FL-Hamilton FL-Ware GA-
Charlton GA-
435 PM EDT Sat Jun 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN NASSAU...BAKER...
NORTHEASTERN UNION...NORTHERN COLUMBIA...SOUTHEASTERN HAMILTON...
SOUTHEASTERN WARE AND SOUTHEASTERN CHARLTON COUNTIES IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds and
heavy rain are still possible with these thunderstorms.

LAT...LON 3037 8288 3058 8247 3058 8242 3061 8242
      3075 8215 3070 8178 3005 8225 3029 8280
      3034 8280 3034 8284
TIME...MOT...LOC 2030Z 271DEG 23KT 3091 8233 3039 8271 

$$

HESS

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 12, 12:51 PM EDTSpecial Weather StatementJAXGilchrist24 min
Jun 12, 1:22 PM EDTSpecial Weather StatementJAXAlachua, Bradford, Clay, Gilchrist, Putnam, Union38 min
Jun 12, 1:50 PM EDTSpecial Weather StatementJAXClay, Putnam40 min
Jun 12, 1:59 PM EDTSpecial Weather StatementJAXSuwannee46 min
Jun 12, 2:11 PM EDTSpecial Weather StatementJAXBradford, Clay49 min
Jun 12, 2:15 PM EDTSpecial Marine WarningJAX90 min
Jun 12, 2:46 PM EDTSpecial Weather StatementJAXHamilton44 min
Jun 12, 2:50 PM EDTSpecial Weather StatementJAXClay, Saint Johns40 min
Jun 12, 2:51 PM EDTSpecial Marine WarningJAX84 min
Jun 12, 2:53 PM EDTSpecial Weather StatementJAXColumbia, Union37 min
Jun 12, 2:59 PM EDTSevere Thunderstorm WarningJAXDuval14 min
Jun 12, 3:22 PM EDTSevere Thunderstorm WarningJAXBaker, Columbia, Hamilton53 min
Jun 12, 3:25 PM EDTSpecial Weather StatementJAXNassau50 min
Jun 12, 3:27 PM EDTSpecial Weather StatementJAXSuwannee48 min
Jun 12, 3:33 PM EDTSpecial Marine WarningJAX87 min
Jun 12, 4:15 PM EDTSpecial Weather StatementJAXNassau45 min
Jun 12, 5:26 PM EDTSpecial Marine WarningJAX64 min
Jun 12, 2:02 PM EDTSpecial Weather StatementJAXGlynn43 min
Jun 12, 3:46 PM EDTSpecial Weather StatementJAXWayne44 min
Jun 12, 4:27 PM EDTSpecial Weather StatementJAXWayne48 min
Jun 12, 4:37 PM EDTSpecial Weather StatementJAXCamden38 min
Jun 12, 5:00 PM EDTSpecial Weather StatementJAXBrantley30 min
Jun 12, 5:10 PM EDTSpecial Weather StatementJAXBrantley, Pierce50 min
Jun 12, 5:20 PM EDTSevere Thunderstorm WarningJAXBrantley25 min
Jun 12, 5:22 PM EDTSpecial Weather StatementJAXAtkinson53 min
Jun 12, 5:37 PM EDTSpecial Weather StatementJAXJeff Davis38 min
Jun 12, 5:53 PM EDTSpecial Weather StatementJAXBrantley, Pierce52 min
Jun 12, 5:56 PM EDTSpecial Weather StatementJAXAtkinson49 min
Jun 12, 6:44 PM EDTSpecial Weather StatementJAXAtkinson46 min
Jun 12, 7:02 PM EDTSpecial Weather StatementJAXCoffee28 min
Jun 12, 7:12 PM EDTSpecial Weather StatementJAXWayne33 min
Jun 12, 7:21 PM EDTSevere Thunderstorm WarningJAXAtkinson, Clinch, Coffee39 min
Jun 12, 7:31 PM EDTSpecial Weather StatementJAXWayne44 min
Jun 12, 7:42 PM EDTSpecial Weather StatementJAXAppling, Jeff Davis48 min
Jun 12, 7:45 PM EDTSpecial Weather StatementJAXBacon30 min
Jun 12, 7:57 PM EDTSevere Thunderstorm WarningJAXAppling, Bacon, Coffee, Jeff Davis33 min

Nearby

Severe Thunderstorm Warnings in Florida, 2021Severe Thunderstorm Warnings in Georgia, 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.