F1 tornado, Illinois City to Matherville, Illinois, April 13, 2006

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.

Rating

F1

Date

April 13, 2006

Touchdown

9:29 PM CDT (02:29 UTC)

Path length

13.0 miles (20.9 km)

Path width

880 yards (805 m)

Deaths

0

Injuries

0

Property damage

$20,000

Counties

Mercer and Rock Island counties

Touchdown point

41.330, -90.980

Lift-off point

41.320, -90.750

Record number

362

Tornado developed 4.2 miles west southwest of Muscatine Iowa at 2013 CST and moved east southeast crossing the Mississippi River into Rock Island County Illinois at 2020 CST. Upon reaching dry land on the Illinois side of the Mississippi River, the tornado turned to the north and dissipated just south of highway 92 6.5 miles west of Illinois City. Spotters on both sides of the river observed the tornado cross the Mississippi.Intermittent F0 tree damage was noted in far southwest Rock Island County.

Tornado developed just north of the Rock Island/Mercer County line near 297th Street West at 2029 CST and moved east southeast 1.9 miles and entered into Mercer County at 2033 CST. The tornado continued moving east southeast in Mercer County and dissipated 0.8 miles west of Hamlet at 2055 CST. Intermittent F0 and F1 damage was noted to trees and outbuildings along its path.

Tornado developed at 2029 CST 6.2 miles southwest of Illinois City near 297th Street West in Rock Island County and crossed into Mercer County 2.9 miles north northeast of Eliza at 2033 CST. The tornado continued moving east southeast for 11.1 miles and dissipated 0.8 miles west of Hamlet. Intermittent F0 and F1 damage was noted to trees and outbuildings along its path.

Tornado developed 1 mile northwest of Mannon at 2057 CST and moved southeast just missing the village and dissipated 0.5 miles east southeast of Mannon at 2101 CST. A mobile home was destroyed.

Tornado developed just east of 240th Street at 2107 CST and tracked generally east across the far northern part of Matherville and dissipated just west of U.S. 67 east of Matherville at 2111 CST.Two homes had roof damage done to them with the sheriff's office indicating one house was completely unroofed.

Entered from Muscatine County Iowa.

Crossed into Mercer County

Entered from Rock Island County

Rated F1

Rated low F2

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

33 minutes of warning. NWS DVN issued a tornado warning for this county at 01:56 UTC, 33 minutes before the tornado touched down, in force until 03:00 UTC.

The county was under a severe thunderstorm watch, issued at 22:33 UTC and running to 04:57 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 Slight Risk, with a 0.05 chance of a tornado within 25 miles. The outlook in force was issued at 01:00 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.

Muscatine (MUT), 23 km from the path, in the two hours either side.

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

The Quad Cities radar (KDVN), 40 km away, was scanning. The volume nearest the touchdown began at 02:28 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 2006 tornado in IllinoisEvery tornado in Illinois since 1950Warnings in force in Illinois nowThe forecast where you are

17 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.