F2 tornado, Tower Hill to Findlay, Illinois, June 1, 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 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.

Rating

F2

Date

June 1, 1999

Touchdown

8:06 PM CDT (01:06 UTC)

Path length

15.5 miles (24.9 km)

Path width

450 yards (411 m)

Deaths

0

Injuries

4

Property damage

$2.0 million

County

Shelby County

Touchdown point

39.370, -89.030

Lift-off point

39.500, -88.780

Record number

1247

A tornado touched down on the east side of Lake Pana in Shelby County. Four homes and one mobile home were destroyed. A woman in the mobile home was injured and hospitalised for a time. A mile northeast near Route 16, several more homes were damaged or destroyed and two people in one of the destroyed homes were injured. Debris was scattered in the nearby fields. For the next four miles, several homes sustained moderate damage, numerous outbuildings and grain bins were either damaged or destroyed, and one woman sustained minor cuts and bruises. As the tornado moved to the northeast into the Westervelt area, numerous trees were blown down, buildings sustained minor damage, and 9 large grain bins were destroyed. The tornado remained on the ground for another 4.5 miles, knocking down trees and power lines before lifting and dissipating 2 miles southwest of Findlay. Damage was estimated around $2 million.

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

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.

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 01:01 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.

Decatur (DEC), 45 km from the path, in the two hours either side.

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

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

30 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.