EF0 tornado, Natrona, Illinois, August 1, 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

August 1, 2022

Touchdown

4:46 AM CDT (09:46 UTC)

Lifted

4:48 AM CDT (09:48 UTC)

On the ground

2 minutes

Path length

0.4 miles (0.7 km)

Path width

60 yards (55 m)

Deaths

0

Injuries

0

County

Mason County

Touchdown point

40.250, -89.685

Lift-off point

40.246, -89.678

Record number

2208010346-01

3 damage points were recorded along this path by NWS ILX, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF0. The highest wind the damage implies is 83 mph.

• Drone footage shows the swath of corn damage lifted just south of CR 1300 N. Time estimated by Radar.
• An empty trailer hopper was lifted and thrown back toward the west, doing damage to a farm tractor.
• Drone footage shows a distinct touchdown in a cornfield north of CR 1300 N with convergent damage path extending SE toward the intersection of CR 1300 N and CR 3600 E.

Survey points are preliminary and are the raw material the published rating was built from. Source: NWS Damage Assessment Toolkit.

A cold front extending from Wisconsin into eastern Iowa triggered a line of strong to severe thunderstorms during the pre-dawn hours of August 1st. The storms tracked southeastward, producing scattered wind damage along and north of the I-72 corridor. One of the cells spawned a brief EF-1 tornado in the town of Beason in eastern Logan County which severely damaged a grain elevator and numerous trees before quickly lifting. Another storm produced a brief EF-0 tornado near Mason City in Mason County that caused minor damage.

A tornado touched down in a field just north of County Road 1300 North about 2.5 miles north of Mason City at 4:46 AM CDT. The tornado tracked southeastward toward the intersection of County Road 1300 North and County Road 3600 East, flipping an empty trailer hopper and damaging a tractor before quickly dissipating at 4:48 AM 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.

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 General Thunderstorms Risk. The outlook in force was issued at 05:38 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.

The Lincoln radar (KILX), 31 km away, was scanning. The volume nearest the touchdown began at 09:47 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

5 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.