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.

  1. EF065 to 85 mphthis tornado

    Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

  2. EF186 to 110 mph

    Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

  3. 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.

  4. 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.

  5. EF4166 to 200 mph

    Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

  6. 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.

  7. 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)ExpiredProductOffice
14:00 UTC18:36 UTCWind AdvisoryJAX
14:44 UTC19:25 UTCTornado WatchJAX
15:04 UTC15:45 UTCSevere Thunderstorm WarningJAX
16:08 UTC16:30 UTCSevere Thunderstorm WarningJAX

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.

Skew-T log-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2024-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 48 joules per kilogram, CIN -277, lifted condensation level 666 meters above ground. Wind barbs in knots down the right edge.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. The warm shading is its CAPE, the cool shading the inhibition it has to break through.
HodographHodograph, Jacksonville, FL at 12:00Z on 2024-04-03The wind through the lowest 10 kilometers as a curve, rings every 10 meters per second labeled in knots. Zero to 1 km storm-relative helicity 51 square meters per square second, 0 to 6 km bulk shear 60 knots.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. RM and LM are the right and left moving storms Bunkers' method gives; the shaded area is the 0 to 1 km storm-relative helicity.
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

Open this sounding in Storm Lab

Jacksonville, FL (KJAX), 00:00Z

7.9 hours after it, 52 km from the path. April 4, 2024.

Skew-T log-pSkew-T log-p diagram, Jacksonville, FL at 00:00Z on 2024-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 0 joules per kilogram, CIN -100599, lifted condensation level 1117 meters above ground. Wind barbs in knots down the right edge.LCL10008507005003002001001 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. The warm shading is its CAPE, the cool shading the inhibition it has to break through.
HodographHodograph, Jacksonville, FL at 00:00Z on 2024-04-04The wind through the lowest 10 kilometers as a curve, rings every 10 meters per second labeled in knots. Zero to 1 km storm-relative helicity 68 square meters per square second, 0 to 6 km bulk shear 98 knots.1939587897117136Sfc1 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. RM and LM are the right and left moving storms Bunkers' method gives; the shaded area is the 0 to 1 km storm-relative helicity.
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

Open this sounding in Storm Lab

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)WindGust (kt)Pressure (mb)Weather
14:10 UTC210° 10 kt1005.1
14:15 UTC210° 8 kt1005.1
14:20 UTC220° 8 kt1005.1HZ
14:25 UTC210° 8 kt1005.4HZ
14:30 UTC210° 10 kt1005.4HZ
14:35 UTC210° 11 kt1005.4HZ
14:40 UTC200° 8 kt1005.1HZ
14:45 UTC200° 10 kt1004.7HZ
14:50 UTC190° 10 kt1004.7HZ
14:55 UTC190° 8 kt1004.7HZ
14:56 UTC7670200° 9 kt161004.7HZ
15:00 UTC200° 10 kt1004.4
15:05 UTC190° 9 kt1004.4HZ
15:10 UTC190° 8 kt1004.1HZ
15:15 UTC190° 8 kt1004.1HZ
15:20 UTC190° 11 kt1004.1HZ
15:25 UTC200° 11 kt1004.4HZ
15:30 UTC210° 10 kt1004.1HZ
15:35 UTC200° 9 kt1004.4HZ
15:40 UTC210° 9 kt1004.4HZ
15:45 UTC200° 9 kt141004.1HZ
15:50 UTC200° 10 kt1003.7HZ
15:54 UTC75.271.6210° 12 kt191003.7-RA BR
15:55 UTC210° 11 kt1003.7-RA
15:56 UTC7671210° 11 kt191003.7-RA
16:00 UTC210° 8 kt1003.7-RA
16:03 UTC75.271.6220° 9 kt1004.1-RA
16:05 UTC210° 11 kt1004.1-RA
16:10 UTC210° 9 kt1004.1-RA
16:14 UTC75.271.6210° 8 kt1003.7-RA
16:15 UTC210° 8 kt1004.1-RA
16:20 UTC220° 8 kt1004.1-RA
16:25 UTC270° 8 kt1004.4-RA
16:30 UTC 371005.1-RA
16:33 UTC71.669.8280° 13 kt371005.1+TSRA BR
16:35 UTC 1004.7+RA BR
16:36 UTC71.668270° 12 kt371004.4+TSRA BR
16:40 UTC220° 11 kt1004.4+RA BR
16:41 UTC69.868230° 11 kt191004.4+TSRA BR
16:45 UTC230° 8 kt1004.1+RA BR
16:46 UTC69.868240° 9 kt161004.4+TSRA BR
16:50 UTC280° 9 kt1004.1+RA BR
16:54 UTC69.868270° 12 kt1004.4TSRA BR
16:55 UTC270° 13 kt191004.4RA BR
16:56 UTC6968270° 14 kt191004.4TSRA BR
17:00 UTC280° 10 kt1004.4RA BR
17:01 UTC69.868270° 12 kt191004.4RA BR
17:05 UTC260° 10 kt1004.4+RA BR
17:08 UTC69.868270° 9 kt191004.1+RA BR
17:10 UTC270° 10 kt1004.1RA BR
17:15 UTC69.868260° 10 kt141004.1RA BR
17:15 UTC260° 9 kt1004.1RA BR
17:20 UTC250° 9 kt1004.4+RA BR
17:23 UTC69.868230° 8 kt1004.4VCTS +RA BR
17:25 UTC240° 5 kt1004.4+RA BR
17:30 UTC240° 9 kt1003.7+RA BR
17:35 UTC260° 13 kt1003.4RA BR
17:40 UTC270° 10 kt1003.4+RA BR
17:45 UTC270° 14 kt1003.7+RA BR
17:50 UTC270° 13 kt1003.7+RA BR
17:56 UTC7068270° 15 kt221003.7+TSRA BR
18:03 UTC69.868260° 11 kt211003.7+TSRA BR
18:05 UTC69.868240° 12 kt201003.7VCTS +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)ReportWhereCountyRemark
15:30 UTCHAIL 0.253 Nnw Asbury LakeClay, FLVideo relayed via Social Media of pea sized hail near Middleburg High School. Time estimated from radar.
16:00 UTCTSTM WND GST 412 Wnw MayportAmz452, FLMesonet station 1483W FSWN JFRD Station 40.
16:02 UTCTSTM WND GST 432 N MayportAmz452, FLMesonet station XHUP Weatherflow station at Huguenot Park.
16:08 UTCTORNADO1 Ssw DurbinSt. Johns, FLA 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 UTCTSTM WND DMG1 Sw DurbinSt. Johns, FLPictures 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 UTCTSTM WND GST 432 Nnw Vilano BeachSt. Johns, FLAWOS station KSGJ St Augustine measured 43 mph wind gust.
17:14 UTCTSTM WND DMG3 Ese ArlingtonDuval, FLBroadcast 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.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
April 33:44 AM EDTEF0Houston, GA1.2150
April 34:49 AM EDTEF1Crisp, GA5.5300
April 34:04 PM EDTEF1Richmond, VA5.8100$276,000

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.