Tornadoes · United States · Florida · 1998

F1 tornado, Westbay, Florida, September 29, 1998

This F1 tornado ran 3.0 miles across Bay County on September 29, 1998, touching down at 9:15 AM CDT and reaching 70 yards wide. It killed nobody and injured 1, and did $120,000 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
September 29, 1998
Touchdown
9:15 AM CDT (14:15 UTC)
Path length
3.0 miles (4.8 km)
Path width
70 yards (64 m)
Deaths
0
Injuries
1
Property damage
$120,000
County
Bay County
Touchdown point
30.280, -85.870
Lift-off point
30.280, -85.870
Record number
1356

What the Weather Service recorded

An F1 tornado touched down in West Bay. The tornado damaged the West Bay Holiness Community Church off CR 388. The church's roof was lifted off and its steeple toppled. The tornado skipped northward across FL 79 and Vinson Rd, north of the Woodville subdivision where several large trees were uprooted. A woman was injured by flying glass when the tornado demolished the roof of her home and blew in a window and glass door.

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. One was issued for the county at another hour that day.

Issued (UTC)ExpiredProductOffice
12:51 UTC18:45 UTCFlash Flood WarningTAE
13:07 UTC13:55 UTCTornado WarningTAE
14:13 UTC15:30 UTCSevere Thunderstorm WarningTAE

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. The outlook in force was issued at 10:53 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.

Eglin AFB/Valpar, FL (KVPS), 12:00Z

2.3 hours before the tornado, 64 km from the path. September 29, 1998.

Skew-T log-pSkew-T log-p diagram, Eglin AFB/Valpar, FL at 12:00Z on 1998-09-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 641 joules per kilogram, CIN 0, lifted condensation level 561 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, Eglin AFB/Valpar, FL at 12:00Z on 1998-09-29The 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 176 square meters per square second, 0 to 6 km bulk shear 20 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
641 J/kg
Mixed-layer CIN
0 J/kg
Surface CAPE
1581 J/kg
Mixed-layer LCL
561 m above ground
0-6 km bulk shear
20 kt
0-1 km bulk shear
33 kt
0-1 km storm-relative helicity
176 m²/s²
0-3 km storm-relative helicity
162 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.8
0-3 km lapse rate
5.5 K/km

Open this sounding in Storm Lab

The radar

The Eglin Afb radar (KEVX), 32 km away, was scanning. The volume nearest the touchdown began at 14:17 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 September 29, 1998

19 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
September 292:30 AM CDTF1Geneva, AL1.0603$100,000
September 292:40 AM CDTF1Coffee, AL1.080$1.5 million
September 292:45 AM CDTF1Coffee, AL1.050$500,000
September 292:45 AM CDTF1Geneva, AL3.050$50,000
September 296:05 AM EDTF1Mitchell, GA3.0601$500,000
September 292:00 PM EDTF1Randolph, GA0.5701$500,000
September 293:40 PM EDTF1Thomas, GA1.270$450,000
September 294:15 PM EDTF1Colquitt, GA2.0701$550,000
September 294:30 PM EDTF1Sumter, GA0.25012$200,000
September 295:00 PM EDTF1Worth, GA1.790$300,000
September 295:35 PM EDTF1Sumter, GA0.25010$200,000
September 296:10 PM EDTF0Sumter, GA0.250
September 294:20 PM MDTF0Rio Arriba, NM0.130
September 296:30 PM EDTF0Decatur, GA0.640$50,000
September 298:00 PM EDTF0Madison, FL0.540$30,000
September 298:30 PM EDTF1Miller, GA2.0802$750,000
September 297:31 PM CDTF0Barton, KS1.0110
September 297:33 PM CDTF0Barton, KS1.0110
September 2912:30 AM EDTF2Suwannee, FL2.01005$600,000

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.