Tornadoes · United States · Florida · 2024
EF0 tornado, Saint Johns County, Florida, April 3, 2024
This EF0 tornado ran 0.3 miles across Saint Johns County on April 3, 2024, touching down at 12:08 PM EDT and reaching 125 yards wide. It killed nobody.
The rating scale
Tracks are drawn in the color of the rating. The Enhanced Fujita scale rates the damage rather than measuring the wind: the speeds are what that damage is taken to imply.
EF065 to 85 mphthis tornado
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
EF186 to 110 mph
Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.
EF2111 to 135 mph
Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.
EF3136 to 165 mph
Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.
EF4166 to 200 mph
Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.
EF5over 200 mph
Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.
Unrated
The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.
The record
- Rating
- EF0
- Date
- April 3, 2024
- Touchdown
- 12:08 PM EDT (16:08 UTC)
- Lifted
- 12:09 PM EDT (16:09 UTC)
- On the ground
- 1 minutes
- Path length
- 0.3 miles (0.4 km)
- Path width
- 125 yards (114 m)
- Deaths
- 0
- Injuries
- 0
- County
- Saint Johns County
- Touchdown point
- 30.076, -81.470
- Lift-off point
- 30.078, -81.466
- Record number
- 2404031008-01
The damage survey
5 damage points were recorded along this path by NWS JAX, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF0. The highest wind the damage implies is 76 mph.
- 72 Strobe Ct had roof damage.
- Patio furniture strewn about.
Survey points are preliminary and are the raw material the published rating was built from. Source: NWS Damage Assessment Toolkit.
The warnings
No tornado warning for this county appears in the archive as in force at the moment the tornado touched down.
The county was under a tornado watch, issued at 14:44 UTC and running to 19:25 UTC.
| Issued (UTC) | Expired | Product | Office |
|---|---|---|---|
| 14:00 UTC | 18:36 UTC | Wind Advisory | JAX |
| 14:44 UTC | 19:25 UTC | Tornado Watch | JAX |
| 15:04 UTC | 15:45 UTC | Severe Thunderstorm Warning | JAX |
| 16:08 UTC | 16:30 UTC | Severe Thunderstorm Warning | JAX |
Every warning and watch covering the touchdown point that day, from the Iowa Environmental Mesonet's archive of National Weather Service products. Lead time is measured from the issue of the warning in force to the touchdown time in the database, both of which were recorded to the minute by different people.
The forecast that day
The Storm Prediction Center had this point in a Slight Risk, with a 0.02 chance of a tornado within 25 miles. The outlook in force was issued at 12:26 UTC.
SPC's Day 1 convective outlook as it stood when the tornado began, read at the touchdown point. The same archive is on the radar archive.
The air that afternoon
The radiosonde launches on either side of the tornado, from the nearest station that was launching then, drawn and analyzed the way Storm Lab does: the same diagram, the same parcel and shear definitions SPC's mesoanalysis uses.
Jacksonville, FL (KJAX), 12:00Z
4.1 hours before the tornado, 52 km from the path. April 3, 2024.
- Mixed-layer CAPE
- 48 J/kg
- Mixed-layer CIN
- -277 J/kg
- Surface CAPE
- 194 J/kg
- Mixed-layer LCL
- 666 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
- 0-3 km lapse rate
- 4.0 K/km
Jacksonville, FL (KJAX), 00:00Z
7.9 hours after it, 52 km from the path. April 4, 2024.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- -100599 J/kg
- Surface CAPE
- 11 J/kg
- Mixed-layer LCL
- 1117 m above ground
- 0-6 km bulk shear
- 98 kt
- 0-1 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 208 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
- 0-3 km lapse rate
- 4.3 K/km
The surface observations
St Augustine Airpt (SGJ), 18 km from the path, in the two hours either side.
| Time (UTC) | Temp (°F) | Dew point (°F) | Wind | Gust (kt) | Pressure (mb) | Weather |
|---|---|---|---|---|---|---|
| 14:10 UTC | 210° 10 kt | 1005.1 | ||||
| 14:15 UTC | 210° 8 kt | 1005.1 | ||||
| 14:20 UTC | 220° 8 kt | 1005.1 | HZ | |||
| 14:25 UTC | 210° 8 kt | 1005.4 | HZ | |||
| 14:30 UTC | 210° 10 kt | 1005.4 | HZ | |||
| 14:35 UTC | 210° 11 kt | 1005.4 | HZ | |||
| 14:40 UTC | 200° 8 kt | 1005.1 | HZ | |||
| 14:45 UTC | 200° 10 kt | 1004.7 | HZ | |||
| 14:50 UTC | 190° 10 kt | 1004.7 | HZ | |||
| 14:55 UTC | 190° 8 kt | 1004.7 | HZ | |||
| 14:56 UTC | 76 | 70 | 200° 9 kt | 16 | 1004.7 | HZ |
| 15:00 UTC | 200° 10 kt | 1004.4 | ||||
| 15:05 UTC | 190° 9 kt | 1004.4 | HZ | |||
| 15:10 UTC | 190° 8 kt | 1004.1 | HZ | |||
| 15:15 UTC | 190° 8 kt | 1004.1 | HZ | |||
| 15:20 UTC | 190° 11 kt | 1004.1 | HZ | |||
| 15:25 UTC | 200° 11 kt | 1004.4 | HZ | |||
| 15:30 UTC | 210° 10 kt | 1004.1 | HZ | |||
| 15:35 UTC | 200° 9 kt | 1004.4 | HZ | |||
| 15:40 UTC | 210° 9 kt | 1004.4 | HZ | |||
| 15:45 UTC | 200° 9 kt | 14 | 1004.1 | HZ | ||
| 15:50 UTC | 200° 10 kt | 1003.7 | HZ | |||
| 15:54 UTC | 75.2 | 71.6 | 210° 12 kt | 19 | 1003.7 | -RA BR |
| 15:55 UTC | 210° 11 kt | 1003.7 | -RA | |||
| 15:56 UTC | 76 | 71 | 210° 11 kt | 19 | 1003.7 | -RA |
| 16:00 UTC | 210° 8 kt | 1003.7 | -RA | |||
| 16:03 UTC | 75.2 | 71.6 | 220° 9 kt | 1004.1 | -RA | |
| 16:05 UTC | 210° 11 kt | 1004.1 | -RA | |||
| 16:10 UTC | 210° 9 kt | 1004.1 | -RA | |||
| 16:14 UTC | 75.2 | 71.6 | 210° 8 kt | 1003.7 | -RA | |
| 16:15 UTC | 210° 8 kt | 1004.1 | -RA | |||
| 16:20 UTC | 220° 8 kt | 1004.1 | -RA | |||
| 16:25 UTC | 270° 8 kt | 1004.4 | -RA | |||
| 16:30 UTC | 37 | 1005.1 | -RA | |||
| 16:33 UTC | 71.6 | 69.8 | 280° 13 kt | 37 | 1005.1 | +TSRA BR |
| 16:35 UTC | 1004.7 | +RA BR | ||||
| 16:36 UTC | 71.6 | 68 | 270° 12 kt | 37 | 1004.4 | +TSRA BR |
| 16:40 UTC | 220° 11 kt | 1004.4 | +RA BR | |||
| 16:41 UTC | 69.8 | 68 | 230° 11 kt | 19 | 1004.4 | +TSRA BR |
| 16:45 UTC | 230° 8 kt | 1004.1 | +RA BR | |||
| 16:46 UTC | 69.8 | 68 | 240° 9 kt | 16 | 1004.4 | +TSRA BR |
| 16:50 UTC | 280° 9 kt | 1004.1 | +RA BR | |||
| 16:54 UTC | 69.8 | 68 | 270° 12 kt | 1004.4 | TSRA BR | |
| 16:55 UTC | 270° 13 kt | 19 | 1004.4 | RA BR | ||
| 16:56 UTC | 69 | 68 | 270° 14 kt | 19 | 1004.4 | TSRA BR |
| 17:00 UTC | 280° 10 kt | 1004.4 | RA BR | |||
| 17:01 UTC | 69.8 | 68 | 270° 12 kt | 19 | 1004.4 | RA BR |
| 17:05 UTC | 260° 10 kt | 1004.4 | +RA BR | |||
| 17:08 UTC | 69.8 | 68 | 270° 9 kt | 19 | 1004.1 | +RA BR |
| 17:10 UTC | 270° 10 kt | 1004.1 | RA BR | |||
| 17:15 UTC | 69.8 | 68 | 260° 10 kt | 14 | 1004.1 | RA BR |
| 17:15 UTC | 260° 9 kt | 1004.1 | RA BR | |||
| 17:20 UTC | 250° 9 kt | 1004.4 | +RA BR | |||
| 17:23 UTC | 69.8 | 68 | 230° 8 kt | 1004.4 | VCTS +RA BR | |
| 17:25 UTC | 240° 5 kt | 1004.4 | +RA BR | |||
| 17:30 UTC | 240° 9 kt | 1003.7 | +RA BR | |||
| 17:35 UTC | 260° 13 kt | 1003.4 | RA BR | |||
| 17:40 UTC | 270° 10 kt | 1003.4 | +RA BR | |||
| 17:45 UTC | 270° 14 kt | 1003.7 | +RA BR | |||
| 17:50 UTC | 270° 13 kt | 1003.7 | +RA BR | |||
| 17:56 UTC | 70 | 68 | 270° 15 kt | 22 | 1003.7 | +TSRA BR |
| 18:03 UTC | 69.8 | 68 | 260° 11 kt | 21 | 1003.7 | +TSRA BR |
| 18:05 UTC | 69.8 | 68 | 240° 12 kt | 20 | 1003.7 | VCTS +RA BR |
From the Iowa Environmental Mesonet's archive of airport observations.
The radar
The Jacksonville radar (KJAX), 51 km away, was scanning. The volume nearest the touchdown began at 16:07 UTC.
Open the radar archive at this moment, over the track
Reflectivity and velocity, decoded from the Level II archive in the browser. Volumes take a few seconds to open the first time.
What was reported nearby
Local storm reports within 60 km of the path, in the three hours either side.
| Time (UTC) | Report | Where | County | Remark |
|---|---|---|---|---|
| 15:30 UTC | HAIL 0.25 | 3 Nnw Asbury Lake | Clay, FL | Video relayed via Social Media of pea sized hail near Middleburg High School. Time estimated from radar. |
| 16:00 UTC | TSTM WND GST 41 | 2 Wnw Mayport | Amz452, FL | Mesonet station 1483W FSWN JFRD Station 40. |
| 16:02 UTC | TSTM WND GST 43 | 2 N Mayport | Amz452, FL | Mesonet station XHUP Weatherflow station at Huguenot Park. |
| 16:08 UTC | TORNADO | 1 Ssw Durbin | St. Johns, FL | A NWS storm survey discovered damage due to an EF0 tornado with a maximum width of 125 yards that briefly touched down in the Beacon Lake neighborhood in northern St Johns county near US highway 1. The tornado caused dam |
| 16:15 UTC | TSTM WND DMG | 1 Sw Durbin | St. Johns, FL | Pictures relayed via social media of various damage to a neighborhood near US1 and County Rd 210W. Damage included large fence blown partially over, several small trees uprooted, and damage to a roof. Time estimated by r |
| 16:30 UTC | TSTM WND GST 43 | 2 Nnw Vilano Beach | St. Johns, FL | AWOS station KSGJ St Augustine measured 43 mph wind gust. |
| 17:14 UTC | TSTM WND DMG | 3 Ese Arlington | Duval, FL | Broadcast media had a photo showing a large tree branch blocking the left lane of Arlington Expressway eastbound near the Southside connector ramp. |
From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.
This ground now
The live radar over the trackEvery 2024 tornado in FloridaEvery tornado in Florida since 1950Warnings in force in Florida nowThe forecast where you are
The other tornadoes of April 3, 2024
3 more were confirmed in the United States that day.
What this means
Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.
Sources
NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.