Tornadoes · United States · Florida · 1998

F1 tornado, Wauchula to Avon Park, Florida, March 9, 1998

From Wauchula to Avon Park, this F1 tornado ran 15.5 miles across Hardee and Highlands counties on March 9, 1998, touching down at 1:19 AM EST and reaching 200 yards wide. It killed nobody, and did $510,000 of property damage.

The rating scale

Tracks are drawn in the color of the rating. The Fujita scale rates the damage rather than measuring the wind: the speeds are what that damage is taken to imply.

  1. F040 to 72 mph

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

  2. F173 to 112 mphthis tornado

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

  3. F2113 to 157 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. F3158 to 206 mph

    Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.

  5. F4207 to 260 mph

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

  6. F5261 to 318 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
F1
Date
March 9, 1998
Touchdown
1:19 AM EST (06:19 UTC)
Path length
15.5 miles (24.9 km)
Path width
200 yards (183 m)
Deaths
0
Injuries
0
Property damage
$510,000
Counties
Hardee and Highlands counties
Touchdown point
27.480, -81.650
Lift-off point
27.600, -81.430
Record number
1100

What the Weather Service recorded

Ground survey indicated that a tornado initially touched down eleven miles east southeast of Wauchula along Steve Roberts Road, two miles west of County Road 671, in rural, semi-wooded swamp and grassland of eastern Hardee county. The tornado produced "F0" damage in the form of downed trees, power poles and mobile home roof damage.The tornado continued to move northeast across rural, semi-wooded swamp and grassland of eastern Hardee county and crossed the county line into extreme northwest Highlands county at 124 AM EST.The tornado reached its maximum F1 strength and width when it touched down in the uncompleted "Sun 'n Lakes" home development on the southwest side of Avon Park. Hundreds of large trees were uprooted or snapped half-way up from the base in the development around 127 AM EST. A few homes received minor roof and structural damage along Columbus Boulevard west of U.S. Highway 27 in the uncompleted "Sun 'n Lakes" subdivision.The tornado crossed U.S. Highway 27 near Lake Glenada and caused minor roof and structural damage to a few homes, commercial buildings and signs.The tornado continued to skip northeast across Lake Lotela and briefly touched down and caused minor roof and structural damage to a few homes and sheds along E. Roberts Road, approximately five miles east of Avon Park. The tornado lifted and dissipated at approximately 135 AM EST.

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.

Issued (UTC)ExpiredProductOffice
05:52 UTC06:40 UTCSevere Thunderstorm 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 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), 00:00Z

6.3 hours before the tornado, 87 km from the path. March 9, 1998.

Skew-T log-pSkew-T log-p diagram, Tampa Bay, FL at 00:00Z on 1998-03-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 1169 joules per kilogram, CIN -16, lifted condensation level 873 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 1998-03-09The 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 238 square meters per square second, 0 to 6 km bulk shear 47 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
1169 J/kg
Mixed-layer CIN
-16 J/kg
Surface CAPE
1226 J/kg
Mixed-layer LCL
873 m above ground
0-6 km bulk shear
47 kt
0-1 km bulk shear
34 kt
0-1 km storm-relative helicity
238 m²/s²
0-3 km storm-relative helicity
163 m²/s²
Significant tornado parameter
1.0
Supercell composite
4.9
0-3 km lapse rate
6.1 K/km

Open this sounding in Storm Lab

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

5.7 hours after it, 87 km from the path. March 9, 1998.

Skew-T log-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 1998-03-09Temperature 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 -71416, lifted condensation level 1078 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, Tampa Bay, FL at 12:00Z on 1998-03-09The 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 48 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
0 J/kg
Mixed-layer CIN
-71416 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
1078 m above ground
0-6 km bulk shear
60 kt
0-1 km bulk shear
18 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
133 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
4.2 K/km

Open this sounding in Storm Lab

The radar

The Tampa radar (KTBW), 87 km away, was scanning. The volume nearest the touchdown began at 06:17 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 1998 tornado in FloridaEvery tornado in Florida since 1950Warnings in force in Florida nowThe forecast where you are

The other tornadoes of March 9, 1998

9 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
March 91:28 AM ESTF2Polk, FL10.42504$2.0 million
March 91:50 AM ESTF0Osceola, FL0.250$70,000
March 93:10 AM ESTF1Collier, FL2.0801$800,000
March 93:20 AM ESTF1Okeechobee, FL4.010010$5.4 million
March 93:48 AM ESTF1Saint Lucie, FL0.550$3.2 million
March 95:30 AM ESTF0Gloucester, VA1.550$20,000
March 95:45 AM ESTF1Broward, FL2.530
March 95:00 AM CSTF1, FL4.530
March 97:33 PM ESTF1Berks, PA2.050$100,000

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.