Tornadoes · United States · South Carolina · 2004

F1 tornado, Brunson to Fairfax, South Carolina, September 7, 2004

From Brunson to Fairfax, this F1 tornado ran 4.5 miles across Allendale and Hampton counties on September 7, 2004, touching down at 3:30 PM EDT and reaching 100 yards wide. It killed nobody.

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 7, 2004
Touchdown
3:30 PM EDT (19:30 UTC)
Path length
4.5 miles (7.2 km)
Path width
100 yards (91 m)
Deaths
0
Injuries
0
Counties
Allendale and Hampton counties
Touchdown point
32.970, -81.120
Lift-off point
33.020, -81.150
Record number
1674

What the Weather Service recorded

Hurricane Frances made land fall over the Florida Panhandle and continued to track in a generally northward direction into Georgia, before turning more to the northeast. This track placed the Charleston County Warning Area in the favorable right side of the remnants of Frances which produced numerous tornadoes and areas of straight line wind damage over southeast Georgia and south coastal South Carolina. Several Georgia counties also experienced flash flooding as there were isolated rainfall amounts of 5 to 8 inches over a 24 to 36 hour period. This was on top of already saturated ground from heavy rains during the month of August. The South Carolina counties experienced more nuisance type flooding as the rainfall amounts were not as high as what occurred in southeast Georgia.

A tornado knocked down trees in the county before crossing into Allendale county.

A weak F1 tornado crossed from Hampton county into Allendale county. The tornado uprooted and snapped off trees along its path.

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

The warnings

16 minutes of warning. NWS CHS issued a tornado warning for this county at 19:14 UTC, 16 minutes before the tornado touched down, in force until 19:45 UTC.

Issued (UTC)ExpiredProductOffice
19:14 UTC19:45 UTCTornado WarningCHS

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, with a 0.05 chance of a tornado within 25 miles. The outlook in force was issued at 15:26 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.

Charleston AFB, SC (KCHS), 12:00Z

7.5 hours before the tornado, 106 km from the path. September 7, 2004.

Skew-T log-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2004-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 2597 joules per kilogram, CIN 0, lifted condensation level 466 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, Charleston AFB, SC at 12:00Z on 2004-09-07The 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 0 square meters per square second, 0 to 6 km bulk shear 0 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
2597 J/kg
Mixed-layer CIN
0 J/kg
Surface CAPE
2535 J/kg
Mixed-layer LCL
466 m above ground
0-6 km bulk shear
0 kt
0-1 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
6.0 K/km

Open this sounding in Storm Lab

Charleston AFB, SC (KCHS), 00:00Z

4.5 hours after it, 106 km from the path. September 8, 2004.

Skew-T log-pSkew-T log-p diagram, Charleston AFB, SC at 00:00Z on 2004-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 2876 joules per kilogram, CIN 0, lifted condensation level 484 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, Charleston AFB, SC at 00:00Z on 2004-09-08The 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 169 square meters per square second, 0 to 6 km bulk shear 31 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
2876 J/kg
Mixed-layer CIN
0 J/kg
Surface CAPE
2960 J/kg
Mixed-layer LCL
484 m above ground
0-6 km bulk shear
31 kt
0-1 km bulk shear
24 kt
0-1 km storm-relative helicity
169 m²/s²
0-3 km storm-relative helicity
211 m²/s²
Significant tornado parameter
0.0
Supercell composite
11.7
0-3 km lapse rate
6.3 K/km

Open this sounding in Storm Lab

The surface observations

Orangeburg (OGB), 57 km from the path, in the two hours either side.

Time (UTC)Temp (°F)Dew point (°F)WindGust (kt)Pressure (mb)Weather
17:53 UTC8176150° 13 kt201008.1
18:22 UTC80.675.2140° 12 kt201007.8-RA
18:53 UTC8176130° 15 kt221007.1
19:53 UTC8076140° 12 kt211006.4
20:35 UTC80.675.2130° 13 kt181006.1
20:53 UTC8076130° 14 kt221005.8-RA

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

This ground now

The live radar over the trackEvery 2004 tornado in South CarolinaEvery tornado in South Carolina since 1950Warnings in force in South Carolina nowThe forecast where you are

The other tornadoes of September 7, 2004

53 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
September 73:20 AM EDTF0Calhoun, SC0.5100
September 73:30 AM EDTF0Jasper, SC0.550
September 73:55 AM EDTF0Dorchester, SC0.540
September 74:46 AM EDTF2Richland, SC2.54403$100,000
September 75:20 AM EDTF0Allendale, SC2.040
September 75:25 AM EDTF1Richland, SC1.0200$300,000
September 75:40 AM EDTF0Allendale, SC1.040
September 76:17 AM EDTF0Richland, SC0.5100
September 76:35 AM EDTF0Barnwell, SC0.5100
September 77:14 AM EDTF0Aiken, SC0.5100
September 77:28 AM EDTF2Sumter, SC4.05003$1.7 million
September 77:35 AM EDTF1Jasper, SC4.075
September 78:40 AM EDTF1Lee, SC4.0440
September 79:10 AM EDTF0Lee, SC0.5100
September 79:18 AM EDTF0Kershaw, SC3.0400
September 79:35 AM EDTF1Kershaw, SC5.0440
September 79:48 AM EDTF0Calhoun, SC0.5100
September 79:48 AM EDTF0Clarendon, SC0.5100
September 710:00 AM EDTF0Marion, FL0.575
September 710:03 AM EDTF1Sumter, SC3.0400
September 710:40 AM EDTF1Lancaster, SC2.0300
September 710:45 AM EDTF0Putnam, FL0.575
September 711:15 AM EDTF3Kershaw, SC7.08801
September 710:43 AM CDTF2York, SC to NC3.0200$10,000
September 712:00 PM EDTF0Saint Johns, FL0.575
September 712:35 PM EDTF0Darlington, SC1.350$70,000
September 712:40 PM EDTF1Chesterfield, SC8.0440
September 712:45 PM EDTF0Orangeburg, SC0.5100
September 71:10 PM EDTF0Darlington, SC0.750$10,000
September 71:35 PM EDTF0Duval, FL1.01
September 71:38 PM EDTF1Columbus, NC10.040$700,000
September 71:40 PM EDTF0Saint Johns, FL0.575$50,000
September 72:05 PM EDTF1Marlboro, SC5.0100$250,000
September 72:24 PM EDTF1Anson, NC2.075
September 72:27 PM EDTF1Marlboro, SC0.325$60,000
September 72:47 PM EDTF0Robeson, NC0.125
September 73:11 PM EDTF1Darlington, SC0.130$10,000
September 73:50 PM EDTF0Chesterfield, SC1.0150
September 73:53 PM EDTF1Robeson, NC4.240$200,000
September 73:56 PM EDTF0Hoke, NC0.525
September 74:00 PM EDTF0Fairfield, SC16.0400
September 74:20 PM EDTF0Bamberg, SC0.5100
September 75:45 PM EDTF0Florence, SC1.030$2,000
September 76:10 PM EDTF0Robeson, NC1.640$3,000
September 77:11 PM EDTF0Dillon, SC1.330$100,000
September 77:30 PM EDTF0Anderson, SC1.250$2,000
September 77:50 PM EDTF0Duval, FL1.01
September 78:15 PM EDTF1Chester, SC0.550$100,000
September 78:23 PM EDTF2Chesterfield, SC7.04405
September 79:05 PM EDTF0Marlboro, SC0.525$10,000
September 79:05 PM EDTF0Allendale, SC0.540
September 79:20 PM EDTF0Allendale, SC1.050
September 712:00 AM EDTF1Union, SC4.0225$50,000

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.