Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 73, NWS Jacksonville, FL

May 11, 2021Clay County, Duval County, Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at May 11, 2021, 4:49 PM EDT for Clay County, Duval County, Saint Johns County, Florida. It was in force for 41 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 11, 2021, 4:49 PM EDT (20:49 UTC)
Expired: May 11, 2021, 5:30 PM EDT
In force: 41 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Clay County, FL, Duval County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 39 km from the middle of the area, began a volume at 20:51 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, 8.8 hours before the alert went out and 41 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: 125 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1340 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

335 
WUUS52 KJAX 112049
SVRJAX
FLC019-031-109-112130-
/O.NEW.KJAX.SV.W.0073.210511T2049Z-210511T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
449 PM EDT Tue May 11 2021

The National Weather Service in Jacksonville has issued a

* Severe Thunderstorm Warning for...
  Northwestern St. Johns County in northeastern Florida...
  Northeastern Clay County in northeastern Florida...
  Southeastern Duval County in northeastern Florida...

* Until 530 PM EDT.

* At 449 PM EDT, a severe thunderstorm was located over Lakeside, or
  near Orange Park, moving east at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Orange Park, Mandarin, Fruit Cove, Nas Jax, Fleming Island, Doctors
  Inlet, Baymeadows, Lakeside, Oakleaf Plantation and
  Bellair-Meadowbrook Terrace.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3007 8187 3019 8186 3027 8152 3006 8151
TIME...MOT...LOC 2049Z 265DEG 16KT 3014 8179 

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

23

2 follow-up statements

041 
WWUS52 KJAX 112102
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
502 PM EDT Tue May 11 2021

FLC019-031-109-112130-
/O.CON.KJAX.SV.W.0073.000000T0000Z-210511T2130Z/
St. Johns FL-Clay FL-Duval FL-
502 PM EDT Tue May 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR NORTHWESTERN ST. JOHNS...NORTHEASTERN CLAY AND SOUTHEASTERN DUVAL
COUNTIES...

At 502 PM EDT, a severe thunderstorm was located over
Bellair-Meadowbrook Terrace, or over Orange Park, moving east at 15
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Orange Park, Mandarin, Fruit Cove, Nas Jax, Fleming Island, Doctors
Inlet, Baymeadows, Lakeside, Bellair-Meadowbrook Terrace and
Switzerland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3008 8178 3019 8179 3027 8152 3006 8151
TIME...MOT...LOC 2102Z 263DEG 15KT 3015 8174 

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

23

124 
WWUS52 KJAX 112124
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
524 PM EDT Tue May 11 2021

FLC019-031-109-112134-
/O.EXP.KJAX.SV.W.0073.000000T0000Z-210511T2130Z/
St. Johns FL-Clay FL-Duval FL-
524 PM EDT Tue May 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ST. JOHNS...
NORTHEASTERN CLAY AND SOUTHEASTERN DUVAL COUNTIES WILL EXPIRE AT 530
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 gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3008 8178 3019 8179 3027 8152 3006 8151
TIME...MOT...LOC 2124Z 265DEG 16KT 3016 8163 

$$

23

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 1:36 PM EDT	Special Weather Statement	JAX	Columbia	54 min
May 11, 1:40 PM EDT	Special Weather Statement	JAX	Alachua, Gilchrist	50 min
May 11, 2:29 PM EDT	Special Weather Statement	JAX	Alachua	46 min
May 11, 3:31 PM EDT	Special Weather Statement	JAX	Bradford, Union	44 min
May 11, 3:35 PM EDT	Special Weather Statement	JAX	Marion	40 min
May 11, 4:21 PM EDT	Special Weather Statement	JAX	Flagler	39 min
May 11, 4:28 PM EDT	Special Weather Statement	JAX	Bradford, Union	47 min
May 11, 4:40 PM EDT	Special Weather Statement	JAX	Duval	50 min
May 11, 4:56 PM EDT	Special Marine Warning	JAX		94 min
May 11, 5:00 PM EDT	Special Weather Statement	JAX	Flagler	45 min
May 11, 5:10 PM EDT	Special Marine Warning	JAX		65 min
May 11, 5:22 PM EDT	Special Marine Warning	JAX		53 min
May 11, 5:30 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval, Saint Johns	23 min
May 11, 5:52 PM EDT	Special Weather Statement	JAX	Alachua	38 min
May 11, 7:16 PM EDT	Special Weather Statement	JAX	Marion	44 min

Nearby

Severe Thunderstorm Warnings in Florida, 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.