Tornadoes · United States · Georgia · 1998

F2 tornado, Smyrna to Sandy Spgs, Georgia, April 8, 1998

From Smyrna to Sandy Spgs, this F2 tornado ran 3.5 miles across Cobb and Fulton counties on April 8, 1998, touching down at 12:20 AM EDT and reaching 200 yards wide. It killed nobody and injured 4, and did $25 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 mph

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

  3. F2113 to 157 mphthis tornado

    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
F2
Date
April 8, 1998
Touchdown
12:20 AM EDT (04:20 UTC)
Path length
3.5 miles (5.6 km)
Path width
200 yards (183 m)
Deaths
0
Injuries
4
Property damage
$25 million
Counties
Cobb and Fulton counties
Touchdown point
33.880, -84.520
Lift-off point
33.880, -84.420
Record number
777

What the Weather Service recorded

The same supercell that had tracked from Alabama across Haralson and Paulding counties spawned another tornado in Smyrna. The touchdown was along Windy Hill Road just west of Cobb Parkway where a commercial building sustained heavy damage. A filling station and car dealership less than a block east also sustained heavy damage. There was $500,000 to $750,000 in damage to new cars. Trees over a foot in diameter were snapped or uprooted. In total, 59 buildings were damaged, but no injuries were reported. Aerial and ground surveys by NWS employees showed the path varied from 100 to 200 yards wide with a length of about 3 miles. The tornado crossed just into Fulton county near I-285 and the Chattahoochee River. Dime to quarter size hail and other wind damage were also reported in north and central Cobb county.

The tornado continued into Fulton county before lifting temporarily. Large trees were snapped, power lines were downed and damage occurred to buildings. Four minor injuries were reported.

From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.

The warnings

13 minutes of warning. NWS FFC issued a tornado warning for this county at 04:07 UTC, 13 minutes before the tornado touched down, in force until 04:45 UTC.

Issued (UTC)ExpiredProductOffice
22:31 UTC23:15 UTCSevere Thunderstorm WarningFFC
01:44 UTC02:15 UTCSevere Thunderstorm WarningFFC
03:51 UTC04:30 UTCSevere Thunderstorm WarningFFC
04:07 UTC04:45 UTCTornado WarningFFC
05:13 UTC05:45 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 Moderate Risk. The outlook in force was issued at 10:55 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), 00:00Z

4.3 hours before the tornado, 57 km from the path. April 9, 1998.

Skew-T log-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 00:00Z on 1998-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 771 joules per kilogram, CIN -28, lifted condensation level 478 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 00:00Z on 1998-04-09The 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 176 square meters per square second, 0 to 6 km bulk shear 67 knots.1939587897117136Sfc1 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
771 J/kg
Mixed-layer CIN
-28 J/kg
Surface CAPE
977 J/kg
Mixed-layer LCL
478 m above ground
0-6 km bulk shear
67 kt
0-1 km bulk shear
18 kt
0-1 km storm-relative helicity
176 m²/s²
0-3 km storm-relative helicity
313 m²/s²
Significant tornado parameter
1.5
Supercell composite
8.3
0-3 km lapse rate
5.1 K/km

Open this sounding in Storm Lab

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

7.7 hours after it, 57 km from the path. April 9, 1998.

Skew-T log-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 12:00Z on 1998-04-09Temperature 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 -2478, lifted condensation level 1458 meters above ground. Wind barbs in knots down the right edge.LCL10008507005003002001001 km2 km3 km6 km9 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 1998-04-09The 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 -256 square meters per square second, 0 to 6 km bulk shear 70 knots.1939587897117136Sfc1 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
-2478 J/kg
Surface CAPE
31 J/kg
Mixed-layer LCL
1458 m above ground
0-6 km bulk shear
70 kt
0-1 km bulk shear
31 kt
0-1 km storm-relative helicity
-256 m²/s²
0-3 km storm-relative helicity
-4 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
4.4 K/km

Open this sounding in Storm Lab

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 April 8, 1998

13 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
April 84:40 AM CDTF0Hays, TX0.5100
April 84:57 AM CDTF0Hays, TX1.0150
April 87:43 AM CDTF1Claiborne Parish, LA0.2400$70,000
April 810:20 AM CDTF1Covington, AL0.130$30,000
April 86:20 PM CDTF0Crittenden, AR0.530$1,000
April 87:00 PM CDTF0Lawrence, TN0.5200
April 87:01 PM CDTF3Pickens, AL19.53001$820,000
April 87:42 PM CDTF5Oak Grove–Birmingham tornado, AL30.31,32032259$200 million
April 88:00 PM CDTF1Coffee, TN1.0200$50,000
April 88:23 PM CDTF1DeKalb, AL1.8100$100,000
April 88:56 PM CDTF2St. Clair, AL14.4200212$2.0 million
April 811:30 PM EDTF1Haralson, GA3.5200$300,000
April 812:35 AM EDTF2DeKalb, GA19.0800110$75 million

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.