Tornadoes · United States · Florida · 2000

F1 tornado, Sanibel, Florida, September 17, 2000

This F1 tornado ran 18.0 miles across Lee County on September 17, 2000, touching down at 4:43 AM EDT and reaching 20 yards wide. It killed nobody, and did $2.0 million 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
September 17, 2000
Touchdown
4:43 AM EDT (08:43 UTC)
Path length
18.0 miles (29.0 km)
Path width
20 yards (18 m)
Deaths
0
Injuries
0
Property damage
$2.0 million
County
Lee County
Touchdown point
26.450, -81.980
Lift-off point
26.700, -82.150
Record number
549

What the Weather Service recorded

A fast moving tornado, on the low end of the F1 scale, associated with an outer band of hurricane Gordon, touched down along East Gulf Drive, two miles east of Sanibel on Sanibel Island, and caused extensive damage to two condominium complexes, two dozen nearby homes and lanais. The tornado moved north northwest and sporadically touched down along rural County Road 767 on Pine Island in western Lee county. The tornado damaged the roofs of a few homes, carports and toppled or snapped palm trees along it's path. The tornado lifted and dissipated near Bokeelia on the north side of Pine Island. Residents in the path of the tornado in Sanibel indicated that they heard the sound of roaring train and their ears felt an air pressure change as it passed overhead.

A tornado, on the high end of the F1 scale, associated with an outer band of Hurricane Gordon, touched down on the south side of Sanibel Island and rapidly moved north northwest across Periwinkle Way where it removed roofs, destroyed lanais, downed trees, power lines and large branches across the island. The tornado then moved over southern Pine Island where it widened to nearly 200 feet in width and uprooted or stripped numerous mangrove trees. The tornado continued rapidly north northwest along and east of County Road 767 until it moved over Little Pine Island. The tornado caused significant roof damage to two businesses and at least ten homes, carports, garages and lanais along Pine Island Road, west of Matlacha, before it dissipated on the northern side of Little Pine Island. Also, more than a dozen trees were uprooted and five utility poles downed by the tornado along Pine Island Road near west of Matlacha. Residents along Pine Island Road indicated that the torndo sounded like a loud machine or train as it passed overhead.

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 05:20 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), 00:00Z

8.7 hours before the tornado, 130 km from the path. September 17, 2000.

Skew-T log-pSkew-T log-p diagram, Tampa Bay, FL at 00:00Z on 2000-09-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 238 joules per kilogram, CIN -13, lifted condensation level 927 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 2000-09-17The 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 53 square meters per square second, 0 to 6 km bulk shear 9 knots.193958Sfc1 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
238 J/kg
Mixed-layer CIN
-13 J/kg
Surface CAPE
3081 J/kg
Mixed-layer LCL
927 m above ground
0-6 km bulk shear
9 kt
0-1 km bulk shear
16 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
293 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7
0-3 km lapse rate
6.1 K/km

Open this sounding in Storm Lab

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

3.3 hours after it, 130 km from the path. September 17, 2000.

Skew-T log-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 2000-09-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 15 joules per kilogram, CIN -26, lifted condensation level 651 meters above ground. Wind barbs in knots down the right edge.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 2000-09-17The 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 433 square meters per square second, 0 to 6 km bulk shear 66 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
15 J/kg
Mixed-layer CIN
-26 J/kg
Surface CAPE
13 J/kg
Mixed-layer LCL
651 m above ground
0-6 km bulk shear
66 kt
0-1 km bulk shear
36 kt
0-1 km storm-relative helicity
433 m²/s²
0-3 km storm-relative helicity
640 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2
0-3 km lapse rate
4.1 K/km

Open this sounding in Storm Lab

The surface observations

Fort Myers/Page Field (FMY), 20 km from the path, in the two hours either side.

Time (UTC)Temp (°F)Dew point (°F)WindGust (kt)Pressure (mb)Weather
06:53 UTC7673100° 15 kt1009.5-RA
07:53 UTC7672100° 14 kt191008.5-RA
08:53 UTC7573100° 14 kt1008.1RA BR
09:08 UTC75.273.4110° 15 kt221008.5TSRA BR
09:23 UTC75.273.4110° 18 kt221007.5TSRA BR
09:34 UTC75.273.4110° 16 kt211007.8TSRA BR
09:53 UTC7674120° 15 kt211008.1TSRA BR
09:56 UTC75.273.4110° 18 kt251007.8+TSRA BR
10:04 UTC75.273.4110° 17 kt251007.5TSRA BR
10:12 UTC75.273.4120° 21 kt271007.8+TSRA BR
10:21 UTC75.275.2170° 17 kt271009.8+TSRA BR
10:24 UTC75.273.4180° 17 kt421009.8+TSRA BR
10:31 UTC73.471.6190° 9 kt421010.2+RA BR
10:36 UTC73.471.6160° 10 kt161009.8+RA BR

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

This ground now

The live radar over the trackEvery 2000 tornado in FloridaEvery tornado in Florida since 1950Warnings in force in Florida nowThe forecast where you are

The other tornadoes of September 17, 2000

5 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
September 175:33 AM EDTF1Lee, FL14.060$1.0 million
September 175:43 AM EDTF0Charlotte, FL18.00$140,000
September 178:15 AM EDTF0Highlands, FL17.00$30,000
September 1710:15 AM EDTF0Broward, FL0.220$50,000
September 175:45 PM EDTF0Volusia, FL0.580$10,000

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.