Tornadoes · United States · Florida · 2020

EF0 tornado, Homosassa Comps Site to Homosassa Springs, Florida, April 20, 2020

From Homosassa Comps Site to Homosassa Springs, this EF0 tornado ran 7.3 miles across Citrus County on April 20, 2020, touching down at 9:39 AM EDT and reaching 35 yards wide. It killed nobody, and did $100,000 of property damage.

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 20, 2020
Touchdown
9:39 AM EDT (13:39 UTC)
Lifted
9:48 AM EDT (13:48 UTC)
On the ground
9 minutes
Path length
7.3 miles (11.7 km)
Path width
35 yards (32 m)
Deaths
0
Injuries
0
Property damage
$100,000
County
Citrus County
Touchdown point
28.790, -82.690
Lift-off point
28.802, -82.576
Record number
2004200739-01

The damage survey

6 damage points were recorded along this path by NWS TBW, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF0. The highest wind the damage implies is 80 mph.

  • Wooden billboard blown down with poles snaped.

Survey points are preliminary and are the raw material the published rating was built from. Source: NWS Damage Assessment Toolkit.

What the Weather Service recorded

A squall line pushed through West Central Florida on April 20th producing damaging wind gusts across the area.

Video showed a waterspout moving onshore of the|coast in Homosassa, and that same area of rotation continued|along a nearly easterly path. This created a narrow damage path|starting across a mobile home park near Buzzard Point causing 7|structures with minor damage and 2 structures with major damage.|Several trees were then downed or snapped in the Homosassa|Springs Wildlife Park, and snapped power poles, a billboard|down, the sail of a gas station blown off, and one business|with major damage on US Highway 19 and Grover Cleveland|Boulevard before lifting.

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.

The county was under a severe thunderstorm watch, issued at 11:05 UTC and running to 16:02 UTC.

Issued (UTC)ExpiredProductOffice
05:00 UTC00:00 UTCSmall Craft AdvisoryTBW
11:05 UTC16:02 UTCSevere Thunderstorm WatchTBW
11:33 UTC13:30 UTCMarine WarningTBW
13:25 UTC15:30 UTCMarine WarningTBW
15:27 UTC17:30 UTCMarine WarningTBW

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 12:49 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.

Tampa Bay, FL (KTBW), 12:00Z

1.7 hours before the tornado, 123 km from the path. April 20, 2020.

Skew-T log-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 2020-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 1093 joules per kilogram, CIN -37, lifted condensation level 989 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, Tampa Bay, FL at 12:00Z on 2020-04-20The 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 351 square meters per square second, 0 to 6 km bulk shear 65 knots.1939587897Sfc1 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
1093 J/kg
Mixed-layer CIN
-37 J/kg
Surface CAPE
3380 J/kg
Mixed-layer LCL
989 m above ground
0-6 km bulk shear
65 kt
0-1 km bulk shear
41 kt
0-1 km storm-relative helicity
351 m²/s²
0-3 km storm-relative helicity
431 m²/s²
Significant tornado parameter
2.4
Supercell composite
22.1
0-3 km lapse rate
5.4 K/km

Open this sounding in Storm Lab

Tampa Bay, FL (KTBW), 00:00Z

10.3 hours after it, 123 km from the path. April 21, 2020.

Skew-T log-pSkew-T log-p diagram, Tampa Bay, FL at 00:00Z on 2020-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 2 joules per kilogram, CIN -326, lifted condensation level 1371 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, Tampa Bay, FL at 00:00Z on 2020-04-21The 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 60 square meters per square second, 0 to 6 km bulk shear 62 knots.1939587897Sfc1 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
2 J/kg
Mixed-layer CIN
-326 J/kg
Surface CAPE
667 J/kg
Mixed-layer LCL
1371 m above ground
0-6 km bulk shear
62 kt
0-1 km bulk shear
17 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
82 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0
0-3 km lapse rate
5.5 K/km

Open this sounding in Storm Lab

The radar

The Tampa radar (KTBW), 123 km away, was scanning. The volume nearest the touchdown began at 13:39 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
12:42 UTCTSTM WND GST 521 Sse Cedar KeyGmz850, FLBUOY STATION CKYF1 CEDAR KEY, FL.
12:45 UTCTSTM WND DMG2 Nne Cedar KeyLevy, FLCEDAR KEY PD REPORTED DOWN TREE NEAR WILDLIFE REFUGE.
12:48 UTCTSTM WND GST 711 Sse Cedar KeyGmz850, FLBUOY STATION CKYF1 CEDAR KEY, FL.
13:20 UTCTSTM WND DMG5 Ese LebanonLevy, FLCALLER REPORTED TREE DAMAGE ON CR336 NEAR CR 337 BLOCKING BOTH LANES NEAR RAINBOW LAKE ESTATES.
13:36 UTCTSTM WND DMG7 Ssw SantosMarion, FLFLORIDA STATE WATCH OFFICE REPLAYED A REPORT OF PINE TREES BLOCKING THE RIGHT AND CENTER SOUTHBOUND LANES OF INTERSTATE 75 NEAR MILE MARKER 340 IN SOUTHERN MARION COUNTY NEAR MARION OAKS. TIME OF DAMAGE BASED ON RADAR DA
13:37 UTCTSTM WND DMG8 Ssw SantosMarion, FLMARION COUNTY EMERGENCY MANAGEMENT REPORTS A STATIONARY CONSTRUCTION TRAILER THROWN ACROSS INTERSTATE 75 AT THE OCALA WEIGH STATION NEAR BELLEVIEW. TIME OF DAMAGE BASED ON RADAR DATA.
13:37 UTCTORNADO9 Ssw SantosMarion, FLFOX-13 NEWS IN TAMPA BROADCAST A VIDEO OF A TORNADO CROSSING INTERSTATE 75 IN THE VICINITY OF BELLEVIEW NEAR THE OCALA WEIGH STATION. TIME OF EVENT BASED ON RADAR DATA.
13:40 UTCTORNADO7 Ssw SantosMarion, FLMEMBER OF THE PUBLIC SUBMITTED THROUGH SOCIAL MEDIA A VIDEO OF A TORNADO CROSSING INTERSTATE 75 IN THE VICINITY OF BELLEVIEW NEAR MILE MARKER 341.
13:41 UTCTSTM WND GST 52Ocala AirportMarion, FLPEAK GUST OF 52 MPH RECORDED AT THE OCALA INTERNATIONAL AIRPORT.
13:51 UTCTSTM WND GST 46Ocala AirportMarion, FLPEAK GUST OF 46 MPH RECORDED AT THE OCALA INTERNATIONAL AIRPORT.
14:13 UTCTSTM WND DMG2 Wnw Homosassa SpringsCitrus, FLMULTIPLE TREES DOWN AND GAS STATION COVER BLOWN OFF FROM POSSIBLE BRIEF TORNADO. TIME APPROX.
14:13 UTCTORNADO2 Wnw Homosassa SpringsCitrus, FLCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 WNW HOMOSASSA SPRINGS. MULTIPLE TREES DOWN AND GAS STATION COVER BLOWN OFF. SEVERAL STRUCTURES WITH DAMAGE ALONG THE PATH, INCLUDING 7 WITH MINOR DAMAGE, 2 WITH MAJOR DAMAGE,
14:25 UTCTSTM WND DMG4 N WildwoodSumter, FLTREE DOWN ON CR 110 NEAR WILDWOOD. LOCATION AND TIME ESTIMATED.

From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.

This ground now

The live radar over the trackEvery 2020 tornado in FloridaEvery tornado in Florida since 1950Warnings in force in Florida nowThe forecast where you are

The other tornadoes of April 20, 2020

3 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
April 202:10 AM EDTEF2Worth, GA8.7500$350,000
April 209:35 AM EDTEF1Marion, FL0.5500
April 2011:45 AM EDTEF0Seminole, FL2.725

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.