Alert archive / Florida / Tornado Warnings in 2021

Tornado Warning 17, NWS Jacksonville, FL

March 18, 2021Clay County, Duval County, Florida

NWS Jacksonville, FL issued this tornado warning at Mar 18, 2021, 4:10 PM EDT for Clay County, Duval County, Florida. It was in force for 11 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
Mar 18, 2021, 4:10 PM EDT (20:10 UTC)
Expired
Mar 18, 2021, 4:21 PM EDT
In force
11 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties Clay County, FL, Duval County, FL

The radar

The Jacksonville radar (KJAX), 39 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 watch it was issued in

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

IssuedProductOfficeLasted
Mar 18, 11:42 AM EDTTornado WatchSPC6 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 8.2 hours before the alert went out and 40 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 2021-03-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 162 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2021-03-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 183 square meters per square second.19395878Sfc1 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
162 J/kg
Mixed-layer CIN
-183 J/kg
Mixed-layer LCL
888 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
183 m²/s²
0-3 km storm-relative helicity
220 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

037 
WFUS52 KJAX 182010
TORJAX
FLC019-031-182045-
/O.NEW.KJAX.TO.W.0017.210318T2010Z-210318T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Jacksonville FL
410 PM EDT Thu Mar 18 2021

The National Weather Service in Jacksonville has issued a

* Tornado Warning for...
  Northern Clay County in northeastern Florida...
  South central Duval County in northeastern Florida...

* Until 445 PM EDT.
    
* At 409 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Middleburg, moving northeast at 40 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...
  Oakleaf Plantation and Cecil Field around 420 PM EDT.
  Lakeside, Doctors Inlet and Fleming Island around 425 PM EDT.
  Orange Park and Bellair-Meadowbrook Terrace around 430 PM EDT.
  Mandarin, Fruit Cove, Nas Jax, Ortega and Normandy around 435 PM 
  EDT.
  San Marco and Riverside around 440 PM EDT.

Other locations impacted by this tornadic thunderstorm include
Jacksonville Heights and Asbury Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to 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 3012 8156 3013 8160 3012 8168 3009 8168
      3002 8195 3011 8200 3039 8168
TIME...MOT...LOC 2009Z 237DEG 37KT 3009 8192 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

NELSON
2 follow-up statements
949 
WWUS52 KJAX 182017
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
417 PM EDT Thu Mar 18 2021

FLC019-031-182045-
/O.CON.KJAX.TO.W.0017.000000T0000Z-210318T2045Z/
Clay FL-Duval FL-
417 PM EDT Thu Mar 18 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM EDT FOR NORTH
CENTRAL CLAY AND SOUTH CENTRAL DUVAL COUNTIES...
    
At 417 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Oakleaf Plantation, or 7 miles northeast of
Middleburg, moving northeast at 45 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...
  Orange Park, Mandarin and Bellair-Meadowbrook Terrace around 430 
  PM EDT.
  Nas Jax, Ortega and Riverside around 435 PM EDT.
  San Marco around 440 PM EDT.

Other locations impacted by this tornadic thunderstorm include
Jacksonville Heights.

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 3008 8185 3015 8191 3036 8166 3016 8158
TIME...MOT...LOC 2017Z 237DEG 37KT 3014 8183 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

AK
017 
WWUS52 KJAX 182021
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
421 PM EDT Thu Mar 18 2021

FLC019-031-182030-
/O.CAN.KJAX.TO.W.0017.000000T0000Z-210318T2045Z/
Clay FL-Duval FL-
421 PM EDT Thu Mar 18 2021

...THE TORNADO WARNING FOR NORTH CENTRAL CLAY AND SOUTH CENTRAL DUVAL
COUNTIES IS CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, damaging winds remain likely and a Severe 
Thunderstorm Warning remains in effect for the area.  

A Tornado Watch remains in effect until 600 PM EDT for northeastern
Florida.

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

LAT...LON 3008 8185 3015 8191 3036 8166 3016 8158
TIME...MOT...LOC 2018Z 237DEG 37KT 3017 8179 

$$

AK

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 18, 2:31 AM EDTWind AdvisoryJAXAlachua, Baker, Bradford, Duval, Flagler, Gilchrist and 4 more15 hr
Mar 18, 11:53 AM EDTSpecial Weather StatementJAXHamilton, Suwannee82 min
Mar 18, 12:55 PM EDTSpecial Weather StatementJAXGilchrist, Suwannee50 min
Mar 18, 1:16 PM EDTSpecial Weather StatementJAXHamilton29 min
Mar 18, 1:33 PM EDTSpecial Weather StatementJAXColumbia, Suwannee42 min
Mar 18, 1:41 PM EDTSevere Thunderstorm WarningJAXColumbia, Gilchrist, Suwannee49 min
Mar 18, 2:02 PM EDTSpecial Weather StatementJAXGilchrist43 min
Mar 18, 2:09 PM EDTSpecial Weather StatementJAXBaker, Bradford, Union66 min
Mar 18, 2:29 PM EDTSevere Thunderstorm WarningJAXAlachua, Gilchrist46 min
Mar 18, 2:40 PM EDTTornado WarningJAXAlachua, Gilchrist35 min
Mar 18, 2:58 PM EDTSevere Thunderstorm WarningJAXAlachua, Bradford, Union47 min
Mar 18, 3:07 PM EDTTornado WarningJAXAlachua, Bradford, Union23 min
Mar 18, 3:22 PM EDTSevere Thunderstorm WarningJAXBaker, Bradford, Clay, Duval, Union38 min
Mar 18, 3:40 PM EDTSpecial Weather StatementJAXDuval, Nassau50 min
Mar 18, 3:57 PM EDTSevere Thunderstorm WarningJAXBaker, Bradford, Clay, Duval36 min
Mar 18, 3:59 PM EDTSpecial Marine WarningJAX91 min
Mar 18, 4:41 PM EDTSpecial Weather StatementJAXSaint Johns19 min
Mar 18, 4:49 PM EDTSpecial Weather StatementJAXCitrus56 min
Mar 18, 4:52 PM EDTSpecial Marine WarningJAX83 min
Mar 18, 5:31 PM EDTSpecial Weather StatementJAXDuval44 min
Mar 18, 6:07 PM EDTSpecial Weather StatementJAXDuval23 min
Mar 18, 6:10 PM EDTSpecial Marine WarningJAX2 hr
Mar 18, 7:09 PM EDTSpecial Weather StatementJAXSaint Johns51 min

Nearby

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