F3 tornado, Peru, Indiana, May 30, 2004

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

May 30, 2004

Touchdown

8:55 PM EST (01:55 UTC)

Path length

4.5 miles (7.2 km)

Path width

360 yards (329 m)

Deaths

0

Injuries

1

Property damage

$6.0 million

County

Miami County

Touchdown point

40.730, -86.130

Lift-off point

40.780, -86.050

Record number

146

NWS storm survey found a tornado with a path length near four and one half miles and just less than one quarter mile wide at its greatest width. The storm touched down three and one half miles west southwest of downtown Peru as an F0 and moved northeast at 35 MPH across the northwest corner of the city of Peru. The storm then caused F1 and F2 damage to trees, buildings, and a trailer park where two homes were destroyed and one woman was injured. The storm then intensified to F3 strength as it moved across an industrial park on the north side of Peru, tearing off a roof and knocking down a large communications tower. The storm then quickly began to dissipate as it appeared the rear flank downdraft quickly choked off the circulation in a field near the intersection of Highways U.S. 24 and SR19. Damage estimates were from 5 to 6 million dollars to private property and more than one half million in public property. Miami county was declared a presidential disaster area on June 3rd.

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

13 minutes of warning. NWS IWX issued a tornado warning for this county at 01:42 UTC, 13 minutes before the tornado touched down, in force until 02:45 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, with a 0.05 chance of a tornado within 25 miles. The outlook in force was issued at 16:38 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.

Grissom Afb/Peru (GUS), 13 km from the path, in the two hours either side.

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

The Northern Indiana radar (KIWX), 75 km away, was scanning. The volume nearest the touchdown began at 01:49 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.

Local storm reports within 60 km of the path, in the three hours either side.

From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.

The live radar over the trackEvery 2004 tornado in IndianaEvery tornado in Indiana since 1950Warnings in force in Indiana nowThe forecast where you are

80 more were confirmed in the United States that day.

All 81 of them

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.