Tornadoes · United States · Florida · 2023

EF0 tornado, (Eyw)Key West Inl Ar, Florida, August 16, 2023

This EF0 tornado ran 0.0 miles across Monroe County on August 16, 2023, touching down at 9:55 AM EDT and reaching 20 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
August 16, 2023
Touchdown
9:55 AM EDT (13:55 UTC)
Path length
0.0 miles (0.0 km)
Path width
20 yards (18 m)
Deaths
0
Injuries
0
County
Monroe County
Touchdown point
24.547, -81.787
Lift-off point
24.547, -81.787
Record number
2308160755-01

What the Weather Service recorded

A narrow waterspout developed off the south shore of Key West, and moved north, making landfall as a tornado at Higgs Beach of Key West.

A narrow waterspout with a spray ring extending one-quarter the way up from the water surface to cloud base moved north onshore Higgs Beach as a tornado. The tornado dissipated on the beach without any discernable damage noted. Maximum wind speeds of 50 to 60 mph were estimated at the landfall location.

From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.

The warnings

No tornado warning for this county appears in the archive as in force at the moment the tornado touched down.

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 General Thunderstorms Risk. The outlook in force was issued at 12:49 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.

Key West, FL (KEYW), 12:00Z

1.9 hours before the tornado, 7 km from the path. August 16, 2023.

Skew-T log-pSkew-T log-p diagram, Key West, FL at 12:00Z on 2023-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 2257 joules per kilogram, CIN -2, lifted condensation level 734 meters above ground. Wind barbs in knots down the right edge.LCLEL10008507005003002001001 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, Key West, FL at 12:00Z on 2023-08-16The 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 22 square meters per square second, 0 to 6 km bulk shear 9 knots.1939Sfc1 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
2257 J/kg
Mixed-layer CIN
-2 J/kg
Surface CAPE
2363 J/kg
Mixed-layer LCL
734 m above ground
0-6 km bulk shear
9 kt
0-1 km bulk shear
11 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
38 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
6.4 K/km

Open this sounding in Storm Lab

Key West, FL (KEYW), 00:00Z

10.1 hours after it, 7 km from the path. August 17, 2023.

Skew-T log-pSkew-T log-p diagram, Key West, FL at 00:00Z on 2023-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 381 joules per kilogram, CIN -52, lifted condensation level 1193 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, Key West, FL at 00:00Z on 2023-08-17The 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 40 square meters per square second, 0 to 6 km bulk shear 9 knots.1939Sfc1 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
381 J/kg
Mixed-layer CIN
-52 J/kg
Surface CAPE
1584 J/kg
Mixed-layer LCL
1193 m above ground
0-6 km bulk shear
9 kt
0-1 km bulk shear
8 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
6.4 K/km

Open this sounding in Storm Lab

The surface observations

Key West (EYW), 3 km from the path, in the two hours either side.

Time (UTC)Temp (°F)Dew point (°F)WindGust (kt)Pressure (mb)Weather
11:55 UTC170° 5 kt1014.9
12:00 UTC170° 5 kt1014.9
12:05 UTC180° 7 kt1014.9
12:10 UTC170° 7 kt1014.9
12:15 UTC180° 7 kt1014.9
12:20 UTC160° 7 kt1015.2
12:25 UTC170° 7 kt1015.2
12:30 UTC160° 7 kt1015.2
12:35 UTC180° 7 kt1015.2
12:40 UTC180° 5 kt1015.2
12:45 UTC180° 5 kt1015.6
12:50 UTC170° 5 kt1015.6
12:53 UTC8677170° 6 kt1015.6
12:55 UTC170° 5 kt1015.6
13:00 UTC160° 5 kt1015.6
13:05 UTC150° 8 kt1015.6
13:10 UTC160° 7 kt1015.6
13:15 UTC170° 8 kt1015.6
13:20 UTC170° 8 kt1015.6
13:25 UTC170° 9 kt1015.6
13:30 UTC150° 10 kt1015.6
13:35 UTC150° 9 kt1015.6
13:40 UTC160° 10 kt1015.6
13:45 UTC140° 11 kt1015.6
13:50 UTC150° 11 kt1015.6
13:53 UTC8777150° 13 kt1015.6
13:55 UTC150° 13 kt1015.6
14:00 UTC170° 11 kt1015.6
14:05 UTC190° 10 kt151015.6
14:10 UTC200° 11 kt1015.9
14:11 UTC8578210° 12 kt171015.9
14:15 UTC210° 11 kt171015.9
14:20 UTC210° 11 kt171015.9
14:25 UTC210° 11 kt171015.9
14:30 UTC210° 11 kt171015.9
14:35 UTC210° 11 kt171015.6
14:40 UTC210° 11 kt171015.6
14:45 UTC210° 11 kt171015.6
14:50 UTC210° 11 kt171015.6
14:53 UTC8877210° 12 kt171015.6
14:55 UTC170° 10 kt1015.6
15:00 UTC180° 10 kt1015.6
15:05 UTC170° 11 kt1015.6
15:10 UTC170° 11 kt1015.2
15:15 UTC180° 10 kt1015.6
15:20 UTC180° 10 kt1015.6
15:24 UTC8875160° 10 kt1015.2
15:25 UTC170° 11 kt1015.2
15:30 UTC170° 10 kt161015.2
15:35 UTC160° 11 kt1015.2
15:40 UTC170° 9 kt1015.2
15:45 UTC160° 11 kt1015.6
15:50 UTC160° 11 kt1015.6
15:53 UTC8873170° 11 kt1015.6

From the Iowa Environmental Mesonet's archive of airport observations.

The radar

The Key West radar (KBYX), 10 km away, was scanning. The volume nearest the touchdown began at 13:52 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.

This ground now

The live radar over the trackEvery 2023 tornado in FloridaEvery tornado in Florida since 1950Warnings in force in Florida nowThe forecast where you are

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.