EF0 tornado, Le Roy to Empire, Illinois, September 18, 2022

1. EF065 to 85 mphthis tornado

   Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

2. EF186 to 110 mph

   Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

3. EF2111 to 135 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. EF3136 to 165 mph

   Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.

5. EF4166 to 200 mph

   Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

6. EF5over 200 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

EF0

Date

September 18, 2022

Touchdown

12:28 AM CDT (05:28 UTC)

Lifted

12:34 AM CDT (05:34 UTC)

On the ground

6 minutes

Path length

3.0 miles (4.8 km)

Path width

30 yards (27 m)

Deaths

0

Injuries

0

County

McLean County

Touchdown point

40.340, -88.770

Lift-off point

40.320, -88.720

Record number

2209182328-01

A cold front interacting with a warm and humid airmass triggered several clusters of strong to severe thunderstorms across parts of central Illinois during the evening of September 18th into the early morning of September 19th. The storms were concentrated along and north of I-74 and along and southwest of a Rushville to Springfield line. Many of the storms produced wind damage and large hail, with the largest 2.5 inch-diameter hailstones being observed in Mahomet in Champaign County. In addition, an EF-0 tornado touched down near LeRoy in McLean County causing minor roof damage and knocking down several trees and power poles.

A tornado touched down on the southwest side of LeRoy at 12:28am CDT, knocking a power pole onto a mobile home and a tree onto another mobile home. The tornado tracked southeastward through the southern part of town doing minor tree damage, causing partial roof damage to two duplexes, and tipping over two semis on I-74. It continued southeastward, partially damaging a roof 2.5 miles southeast of LeRoy before dissipating in a field about 3.5 miles southeast of LeRoy at 12:34am CDT.

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.

The county was under a severe thunderstorm watch, issued at 02:28 UTC and running to 08:55 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 00:58 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.

The Lincoln radar (KILX), 54 km away, was scanning. The volume nearest the touchdown began at 05:28 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 2022 tornado in IllinoisEvery tornado in Illinois since 1950Warnings in force in Illinois nowThe forecast where you are

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.