Alert archive / Florida / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 49, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 24, 2021, 4:18 PM EDT for Duval County, Nassau County, Florida; Camden County, Georgia. It was in force for 42 min. 10 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
- Apr 24, 2021, 4:18 PM EDT (20:18 UTC)
- Expired
- Apr 24, 2021, 5:00 PM EDT
- In force
- 42 min
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Duval County, FL, Nassau County, FL, Camden County, GA
The radar
The Jacksonville radar (KJAX), 10 km from the middle of the area, began a volume at 20:19 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 |
|---|---|---|---|
| Apr 24, 4:21 PM EDT | HAIL 1 | 1 Nw Callahan, FL | ESTIMATED QUARTER-SIZED HAIL NEAR CALLAHAN ON SATURDAY AFTERNOON. ESTIMATED TIME BASED ON RADAR DATA. |
| Apr 24, 4:24 PM EDT | TSTM WND DMG | 1 Se Callahan, FL | NASSUA COUNTY 911 REPORTED A TREE DOWNED ALONG US-1 NEAR CALLAHAN. TIME ESTIMATION BASED ON RADAR. |
| Apr 24, 4:27 PM EDT | TSTM WND DMG | 4 Ese Callahan, FL | 911 CALL CENTER REPORTED A WIRE DOWN ON JONAS DR. TIME ESTIMATION BASED ON RADAR |
| Apr 24, 4:32 PM EDT | TSTM WND GST 41 | Jacksonville Internatio, FL | AUTOMATED SURFACE OBSERVING STATION AT JACKSONVILLE INTERNATIONAL AIRPORT MEASURED A PEAK WIND GUST OF 41 MPH. |
| Apr 24, 4:33 PM EDT | TSTM WND GST 41 | 2 Ne Jacksonville Inter, FL | ASOS STATION KJAX JACKSONVILLE INTL AIRPORT HAD A WIND GUST TO 44 MPH. |
| Apr 24, 4:37 PM EDT | HAIL 0.88 | Ese Jacksonville Intern, FL | A NWS EMPLOYEE MEASURED NICKEL SIZE HAIL AT THE JACKSONVILLE NATIONAL WEATHER SERVICE OFFICE. |
| Apr 24, 4:42 PM EDT | HAIL 0.75 | 2 Ese Yulee, FL | DIME SIZE HAIL REPORTED BY OFF DUTY NWS EMPLOYEE NEAR THE INTERSECTION OF AMELIA CONCOURSE AND STATE ROAD 200. |
| Apr 24, 4:42 PM EDT | HAIL 0.75 | Yulee, FL | SEVEREAL PHOTOS AND VIDEOS WERE SHARED BY LOCAL BROADCAST MEDIA OVER SOCIAL MEDIA OF PEA TO PENNY SIZE HAIL FALLING IN YULEE. TIME BASED ON RADAR. |
| Apr 24, 4:45 PM EDT | HAIL 0.75 | 1 Ese Yulee, FL | REPORT OF PENNY SIZE HAILL FALLING NEAR THE INTERSECTION OF SR200 AND CHRISTIAN WAY. |
| Apr 24, 4:59 PM EDT | TSTM WND GST 41 | 1 Ene Fort Caroline, FL | MESONET STATION XJAK JACKSONVILLE REPORTED A WIND GUST TO 41 MPH. |
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 |
|---|---|---|---|
| Apr 24, 10:35 AM EDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Jacksonville, FL (KJAX), launched 12:00Z, 8.3 hours before the alert went out and 9 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 984 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 180 m²/s²
- 0-3 km storm-relative helicity
- 276 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
757
WUUS52 KJAX 242018
SVRJAX
FLC031-089-GAC039-242100-
/O.NEW.KJAX.SV.W.0049.210424T2018Z-210424T2100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
418 PM EDT Sat Apr 24 2021
The National Weather Service in Jacksonville has issued a
* Severe Thunderstorm Warning for...
Central Nassau County in northeastern Florida...
Northern Duval County in northeastern Florida...
South central Camden County in southeastern Georgia...
* Until 500 PM EDT.
* At 418 PM EDT, a severe thunderstorm was located near Ratliff, or
near Callahan, moving east at 45 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Fernandina Beach, Callahan, Jacksonville International Arpt, Yulee,
Cisco Gardens, Nassau Village-Ratliff, Ratliff, Oceanway, Little
Talbot Island and Fort Caroline.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 600 PM EDT for northeastern
Florida...and southeastern Georgia.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3036 8140 3037 8200 3057 8186 3073 8179
3074 8142 3058 8139
TIME...MOT...LOC 2018Z 271DEG 39KT 3052 8186
HAIL...0.88IN
WIND...60MPH
$$
BOOTHE2 follow-up statements
767
WWUS52 KJAX 242039
SVSJAX
Severe Weather Statement
National Weather Service Jacksonville FL
439 PM EDT Sat Apr 24 2021
FLC031-089-GAC039-242100-
/O.CON.KJAX.SV.W.0049.000000T0000Z-210424T2100Z/
Nassau FL-Duval FL-Camden GA-
439 PM EDT Sat Apr 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR NORTHEASTERN NASSAU...NORTHEASTERN DUVAL AND SOUTH CENTRAL CAMDEN
COUNTIES...
At 439 PM EDT, a severe thunderstorm was located near Oceanway, or
near Jacksonville International Arpt, moving east at 45 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Fernandina Beach, Jacksonville International Arpt, Yulee, Cisco
Gardens, Oceanway, Little Talbot Island and Fort Caroline.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 600 PM EDT for northeastern
Florida.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3036 8140 3037 8185 3052 8177 3073 8175
3074 8142 3056 8139
TIME...MOT...LOC 2039Z 271DEG 39KT 3052 8160
HAIL...0.88IN
WIND...60MPH
$$
BOOTHE463
WWUS52 KJAX 242051
SVSJAX
Severe Weather Statement
National Weather Service Jacksonville FL
451 PM EDT Sat Apr 24 2021
FLC031-089-GAC039-242100-
/O.EXP.KJAX.SV.W.0049.000000T0000Z-210424T2100Z/
Nassau FL-Duval FL-Camden GA-
451 PM EDT Sat Apr 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NASSAU...
NORTHEASTERN DUVAL AND SOUTH CENTRAL CAMDEN COUNTIES WILL EXPIRE AT
500 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and has exited into the Atlantic coastal waters. Therefore,
the warning will be allowed to expire.
A Tornado Watch remains in effect until 600 PM EDT for northeastern
Florida.
LAT...LON 3036 8140 3037 8185 3052 8177 3073 8175
3074 8142 3056 8139
TIME...MOT...LOC 2050Z 271DEG 39KT 3052 8148
$$
BOOTHEThe office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 1:37 PM EDT | Special Marine Warning | JAX | 113 min | |
| Apr 24, 2:36 PM EDT | Tornado Warning | JAX | Hamilton | 24 min |
| Apr 24, 2:56 PM EDT | Severe Thunderstorm Warning | JAX | Columbia, Hamilton | 49 min |
| Apr 24, 3:03 PM EDT | Tornado Warning | JAX | Columbia, Hamilton | 27 min |
| Apr 24, 3:14 PM EDT | Severe Thunderstorm Warning | JAX | Columbia, Hamilton | 46 min |
| Apr 24, 3:21 PM EDT | Special Weather Statement | JAX | Duval | 24 min |
| Apr 24, 3:25 PM EDT | Special Marine Warning | JAX | 79 min | |
| Apr 24, 3:30 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Columbia | 45 min |
| Apr 24, 3:40 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Columbia, Hamilton | 35 min |
| Apr 24, 3:57 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Nassau | 48 min |
| Apr 24, 4:10 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Columbia, Nassau | 28 min |
| Apr 24, 4:44 PM EDT | Special Marine Warning | JAX | 46 min | |
| Apr 24, 5:10 PM EDT | Special Marine Warning | JAX | 35 min | |
| Apr 24, 5:20 PM EDT | Special Weather Statement | JAX | Duval | 25 min |
| Apr 24, 5:31 PM EDT | Special Marine Warning | JAX | 59 min | |
| Apr 24, 6:11 PM EDT | Special Marine Warning | JAX | 64 min | |
| Apr 24, 10:57 AM EDT | Severe Thunderstorm Warning | JAX | Atkinson, Clinch | 48 min |
| Apr 24, 11:15 AM EDT | Severe Thunderstorm Warning | JAX | Coffee | 45 min |
| Apr 24, 11:35 AM EDT | Severe Thunderstorm Warning | JAX | Bacon, Ware | 40 min |
| Apr 24, 11:54 AM EDT | Severe Thunderstorm Warning | JAX | Atkinson | 21 min |
| Apr 24, 12:04 PM EDT | Severe Thunderstorm Warning | JAX | Appling, Brantley, Pierce, Wayne | 41 min |
| Apr 24, 12:08 PM EDT | Tornado Warning | JAX | Bacon | 22 min |
| Apr 24, 12:18 PM EDT | Severe Thunderstorm Warning | JAX | Atkinson, Bacon, Clinch, Pierce, Ware | 31 min |
| Apr 24, 12:36 PM EDT | Severe Thunderstorm Warning | JAX | Wayne | 24 min |
| Apr 24, 12:40 PM EDT | Special Weather Statement | JAX | Clinch | 50 min |
| Apr 24, 12:47 PM EDT | Special Weather Statement | JAX | Clinch, Pierce, Ware, Wayne | 28 min |
| Apr 24, 1:20 PM EDT | Special Weather Statement | JAX | Brantley, Clinch, Ware | 25 min |
| Apr 24, 1:46 PM EDT | Severe Thunderstorm Warning | JAX | Clinch, Echols | 44 min |
| Apr 24, 1:50 PM EDT | Special Weather Statement | JAX | Camden, Charlton, Glynn | 40 min |
| Apr 24, 2:15 PM EDT | Severe Thunderstorm Warning | JAX | Glynn | 15 min |
| Apr 24, 2:32 PM EDT | Severe Thunderstorm Warning | JAX | Clinch, Echols | 43 min |
| Apr 24, 3:48 PM EDT | Special Weather Statement | JAX | Camden | 27 min |
| Apr 24, 5:40 PM EDT | Special Weather Statement | JAX | Coffee, Jeff Davis | 35 min |
| Apr 24, 6:18 PM EDT | Special Weather Statement | JAX | Appling, Bacon, Coffee, Jeff Davis, Wayne | 87 min |
| Apr 24, 6:39 PM EDT | Severe Thunderstorm Warning | JAX | Atkinson, Coffee | 36 min |
| Apr 24, 7:12 PM EDT | Severe Thunderstorm Warning | JAX | Appling, Atkinson, Bacon, Coffee, Pierce, Ware | 33 min |
| Apr 24, 7:40 PM EDT | Severe Thunderstorm Warning | JAX | Appling, Bacon, Brantley, Pierce, Ware, Wayne | 35 min |
| Apr 24, 7:57 PM EDT | Special Weather Statement | JAX | Coffee, Jeff Davis | 48 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2021Severe Thunderstorm Warnings in Georgia, 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.