Alert archive / Florida / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 21, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Mar 18, 2021, 3:57 PM EDT for 4 counties in 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
- Mar 18, 2021, 3:57 PM EDT (19:57 UTC)
- Expired
- Mar 18, 2021, 4:33 PM EDT
- In force
- 36 min
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Baker County, FL, Bradford County, FL, Clay County, FL, Duval County, FL
The radar
The Jacksonville radar (KJAX), 30 km from the middle of the area, began a volume at 19:58 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 |
|---|---|---|---|
| Mar 18, 11:42 AM EDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Jacksonville, FL (KJAX), launched 12:00Z, 8.0 hours before the alert went out and 32 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.
- 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
The text
As transmitted.
027
WUUS52 KJAX 181957
SVRJAX
FLC003-007-019-031-182045-
/O.NEW.KJAX.SV.W.0021.210318T1957Z-210318T2045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
357 PM EDT Thu Mar 18 2021
The National Weather Service in Jacksonville has issued a
* Severe Thunderstorm Warning for...
Northeastern Bradford County in northern Florida...
Southeastern Baker County in northeastern Florida...
Northern Clay County in northeastern Florida...
Duval County in northeastern Florida...
* Until 445 PM EDT.
* At 356 PM EDT, a severe thunderstorm was located near Maxville, or
10 miles northwest of Middleburg, moving northeast at 55 mph.
HAZARD...60 mph wind gusts. Possible tornado.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Jacksonville, Orange Park, Starke, Jacksonville International Arpt,
Mandarin, Arlington, Middleburg, Baymeadows, Cisco Gardens and
Ortega.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 600 PM EDT for northern and
northeastern Florida.
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3015 8146 3012 8157 3013 8160 3012 8168
3008 8168 2995 8212 3010 8216 3012 8214
3014 8214 3014 8217 3017 8218 3032 8200
3051 8179 3051 8178 3053 8176 3054 8174
3056 8172
TIME...MOT...LOC 1956Z 225DEG 47KT 3011 8206
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
NELSON4 follow-up statements
285
WWUS52 KJAX 182003
SVSJAX
Severe Weather Statement
National Weather Service Jacksonville FL
403 PM EDT Thu Mar 18 2021
FLC003-007-182012-
/O.CAN.KJAX.SV.W.0021.000000T0000Z-210318T2045Z/
Bradford FL-Baker FL-
403 PM EDT Thu Mar 18 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BRADFORD AND
SOUTHEASTERN BAKER COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 600 PM EDT for northern and
northeastern Florida.
LAT...LON 3012 8157 3013 8160 3012 8168 3008 8168
3007 8169 2998 8203 3003 8205 3028 8205
3056 8172 3015 8146
TIME...MOT...LOC 2002Z 246DEG 38KT 3007 8197
$$
FLC019-031-182045-
/O.CON.KJAX.SV.W.0021.000000T0000Z-210318T2045Z/
Clay FL-Duval FL-
403 PM EDT Thu Mar 18 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR NORTHERN CLAY AND DUVAL COUNTIES...
At 402 PM EDT, a severe thunderstorm was located near Middleburg,
moving northeast at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Jacksonville, Orange Park, Jacksonville International Arpt, Mandarin,
Arlington, Middleburg, Baymeadows, Cisco Gardens, Ortega and Oakleaf
Plantation.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 600 PM EDT for northern and
northeastern Florida.
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3012 8157 3013 8160 3012 8168 3008 8168
3007 8169 2998 8203 3003 8205 3028 8205
3056 8172 3015 8146
TIME...MOT...LOC 2002Z 246DEG 38KT 3007 8197
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
AK170
WWUS52 KJAX 182023
SVSJAX
Severe Weather Statement
National Weather Service Jacksonville FL
423 PM EDT Thu Mar 18 2021
FLC019-182032-
/O.CAN.KJAX.SV.W.0021.000000T0000Z-210318T2045Z/
Clay FL-
423 PM EDT Thu Mar 18 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CLAY COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 600 PM EDT for northeastern
Florida.
LAT...LON 3018 8168 3019 8168 3019 8182 3035 8197
3056 8172 3024 8152
TIME...MOT...LOC 2022Z 225DEG 46KT 3022 8176
$$
FLC031-182045-
/O.CON.KJAX.SV.W.0021.000000T0000Z-210318T2045Z/
Duval FL-
423 PM EDT Thu Mar 18 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR CENTRAL DUVAL COUNTY...
At 422 PM EDT, a severe thunderstorm was located near
Bellair-Meadowbrook Terrace, or near Orange Park, moving northeast at
55 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Jacksonville, Jacksonville International Arpt, Arlington, Baymeadows,
Cisco Gardens, Ortega, Nas Jax, Normandy, San Marco and Riverside.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 600 PM EDT for northeastern
Florida.
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3018 8168 3019 8168 3019 8182 3035 8197
3056 8172 3024 8152
TIME...MOT...LOC 2022Z 225DEG 46KT 3022 8176
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
AK235
WWUS52 KJAX 182030
SVSJAX
Severe Weather Statement
National Weather Service Jacksonville FL
430 PM EDT Thu Mar 18 2021
FLC031-182045-
/O.CON.KJAX.SV.W.0021.000000T0000Z-210318T2045Z/
Duval FL-
430 PM EDT Thu Mar 18 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR CENTRAL DUVAL COUNTY...
At 430 PM EDT, a severe thunderstorm was located over San Marco, or
near Jacksonville, moving northeast at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Jacksonville, Arlington, Nas Jax, Ortega, Normandy, San Marco,
Riverside and Tallyrand.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 600 PM EDT for northeastern
Florida.
A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3019 8172 3030 8177 3045 8165 3027 8154
3020 8167 3019 8168
TIME...MOT...LOC 2030Z 235DEG 40KT 3028 8167
HAIL...<.75IN
WIND...60MPH
$$
AK819
WWUS52 KJAX 182033
SVSJAX
Severe Weather Statement
National Weather Service Jacksonville FL
433 PM EDT Thu Mar 18 2021
FLC031-182043-
/O.CAN.KJAX.SV.W.0021.000000T0000Z-210318T2045Z/
Duval FL-
433 PM EDT Thu Mar 18 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL DUVAL COUNTY IS
CANCELLED...
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 has been cancelled. However gusty winds and
heavy rain are still possible with this thunderstorm.
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 3019 8172 3030 8177 3045 8165 3027 8154
3020 8167 3019 8168
TIME...MOT...LOC 2030Z 225DEG 47KT 3030 8164
$$
AKThe office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 18, 2:31 AM EDT | Wind Advisory | JAX | Alachua, Baker, Bradford, Duval, Flagler, Gilchrist and 4 more | 15 hr |
| Mar 18, 11:53 AM EDT | Special Weather Statement | JAX | Hamilton, Suwannee | 82 min |
| Mar 18, 12:55 PM EDT | Special Weather Statement | JAX | Gilchrist, Suwannee | 50 min |
| Mar 18, 1:16 PM EDT | Special Weather Statement | JAX | Hamilton | 29 min |
| Mar 18, 1:33 PM EDT | Special Weather Statement | JAX | Columbia, Suwannee | 42 min |
| Mar 18, 1:41 PM EDT | Severe Thunderstorm Warning | JAX | Columbia, Gilchrist, Suwannee | 49 min |
| Mar 18, 2:02 PM EDT | Special Weather Statement | JAX | Gilchrist | 43 min |
| Mar 18, 2:09 PM EDT | Special Weather Statement | JAX | Baker, Bradford, Union | 66 min |
| Mar 18, 2:29 PM EDT | Severe Thunderstorm Warning | JAX | Alachua, Gilchrist | 46 min |
| Mar 18, 2:40 PM EDT | Tornado Warning | JAX | Alachua, Gilchrist | 35 min |
| Mar 18, 2:58 PM EDT | Severe Thunderstorm Warning | JAX | Alachua, Bradford, Union | 47 min |
| Mar 18, 3:07 PM EDT | Tornado Warning | JAX | Alachua, Bradford, Union | 23 min |
| Mar 18, 3:22 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Bradford, Clay, Duval, Union | 38 min |
| Mar 18, 3:40 PM EDT | Special Weather Statement | JAX | Duval, Nassau | 50 min |
| Mar 18, 3:59 PM EDT | Special Marine Warning | JAX | 91 min | |
| Mar 18, 4:10 PM EDT | Tornado Warning | JAX | Clay, Duval | 11 min |
| Mar 18, 4:41 PM EDT | Special Weather Statement | JAX | Saint Johns | 19 min |
| Mar 18, 4:49 PM EDT | Special Weather Statement | JAX | Citrus | 56 min |
| Mar 18, 4:52 PM EDT | Special Marine Warning | JAX | 83 min | |
| Mar 18, 5:31 PM EDT | Special Weather Statement | JAX | Duval | 44 min |
| Mar 18, 6:07 PM EDT | Special Weather Statement | JAX | Duval | 23 min |
| Mar 18, 6:10 PM EDT | Special Marine Warning | JAX | 2 hr | |
| Mar 18, 7:09 PM EDT | Special Weather Statement | JAX | Saint Johns | 51 min |
Nearby
Severe Thunderstorm Warnings in Florida, 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.