Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 77, NWS Jacksonville, FL

May 12, 2021Baker County, Columbia County, Hamilton County, Florida; Clinch County, Echols County, Ware County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at May 12, 2021, 2:50 PM EDT for Baker County, Columbia County, Hamilton County, Florida; Clinch County, Echols County, Ware County, Georgia. It was in force for 55 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: May 12, 2021, 2:50 PM EDT (18:50 UTC)
Expired: May 12, 2021, 3:45 PM EDT
In force: 55 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, Clinch County, GA, Echols County, GA, Ware County, GA

The radar

The Moody AFB radar (KVAX), 57 km from the middle of the area, began a volume at 18:52 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, 6.8 hours before the alert went out and 80 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.

546 
WUUS52 KJAX 121850
SVRJAX
FLC003-023-047-GAC065-101-299-121945-
/O.NEW.KJAX.SV.W.0077.210512T1850Z-210512T1945Z/

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

The National Weather Service in Jacksonville has issued a

* Severe Thunderstorm Warning for...
  Northwestern Baker County in northeastern Florida...
  Northeastern Columbia County in northern Florida...
  Northeastern Hamilton County in northern Florida...
  Southeastern Echols County in southeastern Georgia...
  Southeastern Ware County in southeastern Georgia...
  Southeastern Clinch County in southeastern Georgia...

* Until 345 PM EDT.

* At 250 PM EDT, a severe thunderstorm was located 7 miles northeast
  of Jasper, moving east at 40 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Jasper, Fargo, Belmont and Needmore. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3068 8300 3079 8226 3056 8223 3054 8224
      3050 8222 3045 8221 3050 8304
TIME...MOT...LOC 1850Z 266DEG 34KT 3060 8287 

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

SHASHY

3 follow-up statements

236 
WWUS52 KJAX 121915
SVSJAX

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

FLC003-023-047-GAC065-101-299-121945-
/O.CON.KJAX.SV.W.0077.000000T0000Z-210512T1945Z/
Baker FL-Columbia FL-Hamilton FL-Echols GA-Ware GA-Clinch GA-
315 PM EDT Wed May 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NORTHWESTERN BAKER...NORTHEASTERN COLUMBIA...NORTHEASTERN
HAMILTON...SOUTHEASTERN ECHOLS...SOUTHEASTERN WARE AND SOUTHEASTERN
CLINCH COUNTIES...

At 315 PM EDT, a severe thunderstorm was located near Fargo, moving
east 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...
Fargo and Needmore. 

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 3065 8283 3071 8279 3079 8226 3056 8223
      3054 8224 3050 8222 3045 8221 3053 8285
TIME...MOT...LOC 1915Z 268DEG 40KT 3061 8262 

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

SHASHY

772 
WWUS52 KJAX 121927
SVSJAX

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

FLC047-GAC101-121937-
/O.CAN.KJAX.SV.W.0077.000000T0000Z-210512T1945Z/
Hamilton FL-Echols GA-
327 PM EDT Wed May 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HAMILTON AND
SOUTHEASTERN ECHOLS 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 3059 8259 3065 8258 3068 8259 3069 8258
      3070 8259 3074 8258 3079 8226 3056 8223
      3054 8224 3050 8222 3045 8221 3054 8257
TIME...MOT...LOC 1927Z 266DEG 34KT 3062 8249 

$$

FLC003-023-GAC065-299-121945-
/O.CON.KJAX.SV.W.0077.000000T0000Z-210512T1945Z/
Baker FL-Columbia FL-Ware GA-Clinch GA-
327 PM EDT Wed May 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NORTHWESTERN BAKER...NORTHEASTERN COLUMBIA...SOUTHEASTERN WARE
AND SOUTHEASTERN CLINCH COUNTIES...

At 327 PM EDT, a severe thunderstorm was located near Fargo, moving
east at 40 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Fargo.

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 3059 8259 3065 8258 3068 8259 3069 8258
      3070 8259 3074 8258 3079 8226 3056 8223
      3054 8224 3050 8222 3045 8221 3054 8257
TIME...MOT...LOC 1927Z 266DEG 34KT 3062 8249 

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

SHASHY

468 
WWUS52 KJAX 121943
SVSJAX

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

FLC003-023-GAC065-299-121953-
/O.EXP.KJAX.SV.W.0077.000000T0000Z-210512T1945Z/
Baker FL-Columbia FL-Ware GA-Clinch GA-
343 PM EDT Wed May 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BAKER...
NORTHEASTERN COLUMBIA...SOUTHEASTERN WARE AND SOUTHEASTERN CLINCH
COUNTIES WILL EXPIRE AT 345 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

LAT...LON 3059 8259 3065 8258 3068 8259 3069 8258
      3070 8259 3074 8258 3079 8226 3056 8223
      3054 8224 3050 8222 3045 8221 3054 8257
TIME...MOT...LOC 1943Z 266DEG 34KT 3063 8238 

$$

SHASHY

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 11:04 PM EDT	Special Weather Statement	JAX	Suwannee	41 min
May 12, 3:48 AM EDT	Small Craft Advisory	JAX		4 days
May 12, 2:11 PM EDT	Special Weather Statement	JAX	Hamilton	49 min
May 12, 2:19 PM EDT	Special Weather Statement	JAX	Union	41 min
May 12, 3:02 PM EDT	Special Weather Statement	JAX	Baker	43 min
May 12, 3:12 PM EDT	Special Marine Warning	JAX		93 min
May 12, 3:21 PM EDT	Special Weather Statement	JAX	Nassau	39 min
May 12, 3:23 PM EDT	Special Marine Warning	JAX		67 min
May 12, 4:02 PM EDT	Special Weather Statement	JAX	Saint Johns	43 min
May 12, 4:15 PM EDT	Special Weather Statement	JAX	Nassau	60 min
May 12, 4:16 PM EDT	Special Weather Statement	JAX	Nassau	59 min
May 12, 4:32 PM EDT	Special Weather Statement	JAX	Duval	28 min
May 12, 4:38 PM EDT	Special Marine Warning	JAX		88 min
May 12, 4:46 PM EDT	Special Weather Statement	JAX	Saint Johns	29 min
May 12, 4:48 PM EDT	Special Marine Warning	JAX		42 min
May 12, 5:07 PM EDT	Special Weather Statement	JAX	Flagler	38 min
May 12, 5:24 PM EDT	Special Marine Warning	JAX		66 min
May 12, 6:04 PM EDT	Special Marine Warning	JAX		86 min
May 12, 7:29 PM EDT	Special Marine Warning	JAX		31 min
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, 2:44 PM EDT	Severe Thunderstorm Warning	JAX	Brantley, Camden, Glynn, Wayne	47 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 Florida, 2021 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.