Alert archive / Florida / Tornado Warnings in 2021

Tornado Warning 38, NWS Jacksonville, FL

July 7, 2021Duval County, Nassau County, Florida

NWS Jacksonville, FL issued this tornado warning at Jul 7, 2021, 4:54 PM EDT for Duval County, Nassau County, Florida. It was in force for 36 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: Jul 7, 2021, 4:54 PM EDT (20:54 UTC)
Expired: Jul 7, 2021, 5:30 PM EDT
In force: 36 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Tornado: Observed
Hail: 0.0 in

Counties Duval County, FL, Nassau County, FL

The radar

The Jacksonville radar (KJAX), 19 km from the middle of the area, began a volume at 20:57 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 7, 1:04 PM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 8.9 hours before the alert went out and 17 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: 1540 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 838 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

872 
WFUS52 KJAX 072054
TORJAX
FLC031-089-072130-
/O.NEW.KJAX.TO.W.0038.210707T2054Z-210707T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Jacksonville FL
454 PM EDT Wed Jul 7 2021

The National Weather Service in Jacksonville has issued a

* Tornado Warning for...
  Northeastern Nassau County in northeastern Florida...
  Northeastern Duval County in northeastern Florida...

* Until 530 PM EDT.
    
* At 454 PM EDT, a tornado producing storm was located over
  Arlington, moving north at 30 mph.

  HAZARD...Damaging tornado.

  SOURCE...Radar confirmed tornado.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This tornadic storm will be near...
  Oceanway around 515 PM EDT.
  Jacksonville International Arpt around 520 PM EDT.
  Jacksonville around 530 PM EDT.

Other locations impacted by this tornadic thunderstorm include
Tallyrand.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3032 8154 3028 8161 3032 8167 3067 8178
      3074 8166 3073 8165 3074 8163 3072 8161
      3074 8160 3072 8159 3073 8158 3074 8159
      3074 8157 3071 8154 3072 8154 3070 8147
TIME...MOT...LOC 2054Z 180DEG 28KT 3030 8161 

TORNADO...OBSERVED
HAIL...0.00IN

$$

HESS

2 follow-up statements

745 
WWUS52 KJAX 072119
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
519 PM EDT Wed Jul 7 2021

FLC031-089-072130-
/O.CON.KJAX.TO.W.0038.000000T0000Z-210707T2130Z/
Nassau FL-Duval FL-
519 PM EDT Wed Jul 7 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM EDT FOR
NORTHEASTERN NASSAU AND NORTHEASTERN DUVAL COUNTIES...
    
At 518 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Oceanway, or 8 miles east of Jacksonville
International Arpt, moving north at 25 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This dangerous storm will be near...
  Yulee around 550 PM EDT.
  St. Marys and Fernandina Beach around 600 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3039 8153 3038 8153 3036 8157 3040 8161
      3069 8171 3074 8166 3073 8165 3074 8163
      3072 8161 3073 8160 3072 8159 3073 8158
      3074 8159 3074 8157 3071 8154 3072 8154
      3070 8147
TIME...MOT...LOC 2118Z 192DEG 24KT 3047 8156 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

HESS

582 
WWUS52 KJAX 072125
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
525 PM EDT Wed Jul 7 2021

FLC031-089-072135-
/O.EXP.KJAX.TO.W.0038.000000T0000Z-210707T2130Z/
Nassau FL-Duval FL-
525 PM EDT Wed Jul 7 2021

...THE TORNADO WARNING FOR NORTHEASTERN NASSAU AND NORTHEASTERN DUVAL
COUNTIES WILL EXPIRE AT 530 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

A Tornado Watch remains in effect until 800 PM EDT for northeastern
Florida...and southeastern Georgia.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Jacksonville.

LAT...LON 3039 8153 3038 8153 3036 8157 3040 8161
      3069 8171 3074 8166 3073 8165 3074 8163
      3072 8161 3073 8160 3072 8159 3073 8158
      3074 8159 3074 8157 3071 8154 3072 8154
      3070 8147
TIME...MOT...LOC 2125Z 180DEG 28KT 3061 8156 

$$

HESS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 9:53 PM EDT	River Flood Warning	JAX	Alachua, Columbia	13 days
Jul 6, 9:54 PM EDT	River Flood Warning	JAX	Columbia, Hamilton, Suwannee	48 hr
Jul 6, 9:54 PM EDT	River Flood Warning	JAX	Hamilton, Suwannee	71 hr
Jul 6, 11:03 PM EDT	Rip Current Statement	JAX	Duval, Flagler, Nassau	28 hr
Jul 7, 4:02 AM EDT	Tornado Warning	JAX	Alachua, Marion	28 min
Jul 7, 4:29 AM EDT	Tornado Warning	JAX	Alachua, Marion	31 min
Jul 7, 4:33 AM EDT	Tornado Warning	JAX	Marion	27 min
Jul 7, 5:05 AM EDT	Special Weather Statement	JAX	Alachua, Marion	40 min
Jul 7, 5:41 AM EDT	Special Weather Statement	JAX	Alachua, Gilchrist	49 min
Jul 7, 6:02 AM EDT	Tornado Warning	JAX	Alachua, Bradford, Union	28 min
Jul 7, 6:33 AM EDT	Special Weather Statement	JAX	Alachua, Suwannee, Union	57 min
Jul 7, 6:40 AM EDT	Tornado Warning	JAX	Alachua, Columbia, Union	35 min
Jul 7, 7:02 AM EDT	Tornado Warning	JAX	Columbia, Suwannee	28 min
Jul 7, 7:23 AM EDT	Special Weather Statement	JAX	Baker, Bradford, Clay, Columbia, Hamilton, Union	67 min
Jul 7, 8:31 AM EDT	Special Weather Statement	JAX	Baker, Hamilton	44 min
Jul 7, 8:39 AM EDT	Tornado Warning	JAX	Baker, Columbia	11 min
Jul 7, 9:59 AM EDT	Special Weather Statement	JAX	Nassau	46 min
Jul 7, 12:00 PM EDT	Areal Flood Warning	JAX	Alachua, Bradford, Columbia, Gilchrist, Hamilton, Suwannee and 1 more	3 hr
Jul 7, 1:38 PM EDT	Areal Flood Warning	JAX	Alachua, Baker, Bradford, Clay, Columbia, Duval and 4 more	3 hr
Jul 7, 2:45 PM EDT	Special Weather Statement	JAX	Flagler, Saint Johns	60 min
Jul 7, 2:47 PM EDT	Special Weather Statement	JAX	Baker, Clay, Duval, Nassau	58 min
Jul 7, 2:49 PM EDT	Areal Flood Warning	JAX	Hamilton, Suwannee	116 min
Jul 7, 2:54 PM EDT	Areal Flood Warning	JAX	Alachua, Bradford	111 min
Jul 7, 3:24 PM EDT	River Flood Warning	JAX	Columbia, Gilchrist, Suwannee	93 days
Jul 7, 3:31 PM EDT	Areal Flood Warning	JAX	Baker, Clay, Duval, Nassau	2 hr
Jul 7, 3:45 PM EDT	Special Weather Statement	JAX	Clay, Duval, Nassau, Saint Johns	60 min
Jul 7, 4:32 PM EDT	Tornado Warning	JAX	Duval, Saint Johns	28 min
Jul 7, 4:45 PM EDT	Special Weather Statement	JAX	Duval, Nassau	60 min
Jul 7, 5:15 PM EDT	Areal Flood Warning	JAX	Duval, Nassau, Saint Johns	2 hr
Jul 7, 6:42 PM EDT	Special Marine Warning	JAX		93 min
Jul 7, 7:18 PM EDT	Areal Flood Warning	JAX	Nassau	117 min

Nearby

Tornado Warnings in Florida, 2021 Every tornado warning in 2021 Tornadoes 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.