Tornadoes · United States · Georgia · 1998

F1 tornado, Desoto, Georgia, September 29, 1998

This F1 tornado ran 0.2 miles across Sumter County on September 29, 1998, touching down at 5:35 PM EDT and reaching 50 yards wide. It killed nobody and injured 10, and did $200,000 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
5:35 PM EDT (21:35 UTC)
Path length
0.2 miles (0.3 km)
Path width
50 yards (46 m)
Deaths
0
Injuries
10
Property damage
$200,000
County
Sumter County
Touchdown point
31.920, -84.030
Lift-off point
31.920, -84.030
Record number
1269

What the Weather Service recorded

Sight survey by an NWS employee and a newspaper report indicated a permanent structure home and several mobile or modular homes were destroyed in the Ferguson Road area. Debris was scattered several hundred feet.

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
22:05 UTC22:40 UTCTornado WarningFFC

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.

Peachtre/Fal Fld, GA (KFFC), 12:00Z

9.6 hours before the tornado, 167 km from the path. September 29, 1998.

Skew-T log-pSkew-T log-p diagram, Peachtre/Fal Fld, GA 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 96 joules per kilogram, CIN -49, lifted condensation level 765 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, Peachtre/Fal Fld, GA 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 52 square meters per square second, 0 to 6 km bulk shear 25 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
96 J/kg
Mixed-layer CIN
-49 J/kg
Surface CAPE
910 J/kg
Mixed-layer LCL
765 m above ground
0-6 km bulk shear
25 kt
0-1 km bulk shear
19 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
4.9 K/km

Open this sounding in Storm Lab

Peachtre/Fal Fld, GA (KFFC), 00:00Z

2.4 hours after it, 167 km from the path. September 30, 1998.

Skew-T log-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 00:00Z on 1998-09-30Temperature 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 -49119, lifted condensation level 1006 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, Peachtre/Fal Fld, GA at 00:00Z on 1998-09-30The 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 -68 square meters per square second, 0 to 6 km bulk shear 3 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
0 J/kg
Mixed-layer CIN
-49119 J/kg
Surface CAPE
923 J/kg
Mixed-layer LCL
1006 m above ground
0-6 km bulk shear
3 kt
0-1 km bulk shear
27 kt
0-1 km storm-relative helicity
-68 m²/s²
0-3 km storm-relative helicity
20 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
4.9 K/km

Open this sounding in Storm Lab

The surface observations

Albany Municipal (ABY), 45 km from the path, in the two hours either side.

Time (UTC)Temp (°F)Dew point (°F)WindGust (kt)Pressure (mb)Weather
19:50 UTC75.275.2100° 10 kt1008.5RA BR
20:47 UTC75.275.2130° 8 kt1008.5-RA BR
21:50 UTC75.273.4110° 11 kt1008.1RA BR
22:00 UTC75.273.4110° 8 kt1008.5+RA BR
22:23 UTC75.273.4130° 7 kt1008.8+RA BR
22:51 UTC73.473.4150° 8 kt1008.5RA BR
23:07 UTC73.473.4130° 13 kt201008.5-RA BR
23:25 UTC73.473.4120° 14 kt1008.1-RA

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

This ground now

The live radar over the trackEvery 1998 tornado in GeorgiaEvery tornado in Georgia since 1950Warnings in force in Georgia 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 299:15 AM CDTF1Bay, FL3.0701$120,000
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 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.