Alert archive / Florida / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 18, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Mar 18, 2021, 2:29 PM EDT for Alachua County, Gilchrist County, Florida. It was in force for 46 min. 4 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Mar 18, 2021, 2:29 PM EDT (18:29 UTC)
- Expired
- Mar 18, 2021, 3:15 PM EDT
- In force
- 46 min
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Alachua County, FL, Gilchrist County, FL
The radar
The Jacksonville radar (KJAX), 142 km from the middle of the area, began a volume at 18:29 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Mar 18, 2:41 PM EDT | TSTM WND DMG | 6 Nnw Newberry, FL | POSSIBLE TORNADO DAMAGE. DAMAGE TO TRACTOR NEAR CR 337 & CR 232. |
| Mar 18, 2:46 PM EDT | TORNADO | 6 Nnw Newberry, FL | CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 6 NNW NEWBERRY. BRIEF EF-0 TOUCHDOWN NEAR CR 337 & CR 232. BARN FELL ON A TRACTOR. |
| Mar 18, 3:05 PM EDT | TORNADO | 1 Nnw Alachua, FL | CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 NNW ALACHUA. ROOF PEELED OFF CARPORT AND MULTIPLE TREES DOWN, ONE OF WHICH FELL ON AND DAMAGED A CAR. EF-0 DAMAGE, ESTIMATED 81 MPH. |
| Mar 18, 3:08 PM EDT | TSTM WND DMG | 1 Nnw Alachua, FL | POSSIBLE TORNADO DAMAGE. ROOF TORN OFF HOME AND VEHICLE DAMAGED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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, 6.5 hours before the alert went out and 143 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.
119
WUUS52 KJAX 181829
SVRJAX
FLC001-041-181915-
/O.NEW.KJAX.SV.W.0018.210318T1829Z-210318T1915Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
229 PM EDT Thu Mar 18 2021
The National Weather Service in Jacksonville has issued a
* Severe Thunderstorm Warning for...
Gilchrist County in northern Florida...
Western Alachua County in northern Florida...
* Until 315 PM EDT.
* At 229 PM EDT, a severe thunderstorm was located near Trenton,
moving east at 40 mph.
HAZARD...60 mph wind gusts. Possible tornado.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Trenton, Alachua, High Springs, Archer and Newberry.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 600 PM EDT for northern
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.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 2964 8296 2970 8296 2988 8243 2953 8240
2956 8266 2957 8271 2957 8276 2958 8276
2958 8286 2959 8286 2959 8296 2963 8297
TIME...MOT...LOC 1829Z 251DEG 36KT 2961 8287
HAIL...<.75IN
WIND...60MPH
$$
NELSON1 follow-up statement
158
WWUS52 KJAX 181911
SVSJAX
Severe Weather Statement
National Weather Service Jacksonville FL
311 PM EDT Thu Mar 18 2021
FLC001-041-181920-
/O.EXP.KJAX.SV.W.0018.000000T0000Z-210318T1915Z/
Gilchrist FL-Alachua FL-
311 PM EDT Thu Mar 18 2021
...THE SEVERE THUNDERSTORM WARNING FOR GILCHRIST AND WESTERN ALACHUA
COUNTIES WILL EXPIRE AT 315 PM EDT...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 600 PM EDT for northern
Florida.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Jacksonville.
Remember, a Tornado Warning still remains in effect for Alachua
County.
LAT...LON 2964 8296 2970 8296 2988 8243 2953 8240
2956 8266 2957 8271 2957 8276 2958 8276
2958 8286 2959 8286 2959 8296 2963 8297
TIME...MOT...LOC 1910Z 242DEG 50KT 2979 8254
$$
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, 2:40 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, 3:57 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Bradford, Clay, Duval | 36 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.