F3 tornado, Circleville, Ohio, October 13, 1999

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 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 mphthis tornado

   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.

Rating

F3

Date

October 13, 1999

Touchdown

5:00 PM EDT (21:00 UTC)

Path length

3.6 miles (5.8 km)

Path width

0 yards (0 m)

Deaths

0

Injuries

6

Property damage

$4.0 million

Counties

Pickaway and Ross counties

Touchdown point

39.600, -82.980

Lift-off point

39.280, -83.170

Record number

1109

A cold front pushed east from Illinois and Indiana during the afternoon hours and combined with a vigorous upper level disturbance that dropped into the Ohio Valley from the lower Great Lakes region. These factors prompted a squall line to develop ahead of the cold front that moved southeast through the Wilmington Ohio (ILN) county warning area before entering northeast Kentucky and southeast Ohio.

A tornado touched down west of Circleville, pulling a small shed off of its foundation and destroying a section of a construction building. after this, the tornado lifted and then touched down in a more developed area in town. It destroyed a building housing two businesses and ripped the roof off of a section of a strip mall, ejecting furniture from inside the structure. A large sign weighing several hundred pounds was ripped from its foundation and blown twenty feet away. A tractor trailer with a load of 18 to 19 tons was blown over and dragged ten feet away from where it landed. The tornado then proceeded to a housing development where several homes were destroyed, several roofs ripped off, and garages either destroyed or moved from their foundations. Trees were twisted and broken off at their bases and carports were also torn from nearby houses.

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

15 minutes of warning. NWS ILN issued a tornado warning for this county at 20:45 UTC, 15 minutes before the tornado touched down, in force until 21:50 UTC.

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 Storm Prediction Center had this point in a Moderate Risk. The outlook in force was issued at 19:01 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 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.

Rickenbacker Ang (LCK), 43 km from the path, in the two hours either side.

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

The Cincinnati radar (KILN), 64 km away, was scanning. The volume nearest the touchdown began at 21:01 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.

The live radar over the trackEvery 1999 tornado in OhioEvery tornado in Ohio since 1950Warnings in force in Ohio nowThe forecast where you are

2 more were confirmed in the United States that day.

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.

NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.