Tornadoes · United States · Illinois · 2026

Unrated tornado, Henry County, Illinois, August 9, 2026

Name: Unrated tornado, Henry County, Illinois, August 9, 2026
Start: 2026-08-10T02:40:00.000Z
End: 2026-08-10T02:41:00.000Z
Location: Henry County, Illinois

This Unrated tornado ran 0.2 miles across Henry County on August 9, 2026, touching down at 9:40 PM CDT and reaching 10 yards wide. It killed nobody.

Preliminary. This is NWS DVN's damage survey, filed in the Damage Assessment Toolkit as 3 NNE German Corner. The rating, the path and the casualties are the survey's and can change while it is revised. The Storm Prediction Center compiles the official record of 2026 from these surveys and publishes it in the spring of 2027; this page moves to that tornado's permanent address when it does.

The rating scale

Tracks are drawn in the color of the rating. The Enhanced Fujita scale rates the damage rather than measuring the wind: the speeds are what that damage is taken to imply.

EF065 to 85 mph
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
EF186 to 110 mph
Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.
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.
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.
EF4166 to 200 mph
Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.
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.
Unratedthis tornado
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.

The survey

Rating, as surveyed: Unrated, preliminary
Date: August 9, 2026
Touchdown: 9:40 PM CDT (02:40 UTC)
Lifted: 9:41 PM CDT (02:41 UTC)
On the ground: 1 minutes
Path length: 0.2 miles (0.3 km)
Path width: 10 yards (9 m)
Deaths: 0
Injuries: 0
County: Henry County
Touchdown point: 41.340, -89.997
Lift-off point: 41.342, -89.995
Surveyed by: NWS DVN
The office's name for it: 3 NNE German Corner
Survey last edited: September 18, 2026
Record number: None yet. SPC numbers 2026 in the spring of 2027.

What the survey found

A short-lived EFU tornado was documented by storm chasers southwest of Annawan. No damage was found when coordinating potential surveys with EMs.

Written by NWS DVN in the NWS Damage Assessment Toolkit. A survey is revised as better evidence arrives.

The warnings

7 minutes of warning. NWS DVN issued a tornado warning for this county at 02:33 UTC, 7 minutes before the tornado touched down, in force until 03:15 UTC.

The county was under a severe thunderstorm watch, issued at 01:43 UTC and running to 03:48 UTC.

Issued (UTC)	Expired	Product	Office
17:00 UTC	01:00 UTC	Heat Advisory	DVN
01:43 UTC	03:48 UTC	Severe Thunderstorm Watch	DVN
01:57 UTC	02:21 UTC	Severe Thunderstorm Warning	DVN
02:00 UTC	02:19 UTC	Tornado Warning	DVN
02:33 UTC	03:15 UTC	Tornado Warning	DVN

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 forecast that day

The Storm Prediction Center had this point in a Slight Risk, with a 0.02 chance of a tornado within 25 miles. The outlook in force was issued at 00:41 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 air that afternoon

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.

Davenport, (KDVN), 00:00Z

2.7 hours before the tornado, 52 km from the path. August 10, 2026.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed. The warm shading is its CAPE, the cool shading the inhibition it has to break through.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km. RM and LM are the right and left moving storms Bunkers' method gives; the shaded area is the 0 to 1 km storm-relative helicity.

Mixed-layer CAPE: 3740 J/kg
Mixed-layer CIN: -2 J/kg
Surface CAPE: 4775 J/kg
Mixed-layer LCL: 810 m above ground
0-6 km bulk shear: 37 kt
0-1 km bulk shear: 8 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 322 m²/s²
Significant tornado parameter: 4.3
Supercell composite: 24.8
0-3 km lapse rate: 6.3 K/km

Open this sounding in Storm Lab

The radar

The Quad Cities radar (KDVN), 57 km away, was scanning. The volume nearest the touchdown began at 02:38 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.

What was reported nearby

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

Time (UTC)	Report	Where	County	Remark
01:27 UTC	TORNADO	5 Sw Atkinson	Henry, IL	Corrects previous report from 4 SSW Annawan. A short-lived EFU tornado was documented by multiple storm chasers southwest of Atkinson. No damage was found when coordinating potential surveys with EMs.
01:44 UTC	TORNADO	4 Ssw Annawan	Henry, IL	Corrects previous tornado report from 4 SSW Annawan. Time was corrected based on other photo evidence. Multiple chaser pictures and videos of a tornado at this time.
01:57 UTC	TORNADO	5 Ene German Corner	Henry, IL	A short-lived EFU tornado was documented by multiple storm chasers southwest of Annawan. No damage was found when coordinating potential surveys with EMs.
01:58 UTC	TORNADO	4 Ssw Annawan	Henry, IL
02:40 UTC	TORNADO	3 Nne German Corner	Henry, IL	A short-lived EFU tornado was documented by storm chasers southwest of Annawan. No damage was found when coordinating potential surveys with EMs.
03:52 UTC	FUNNEL CLOUD	3 Ne Elmwood	Peoria, IL	Funnel cloud extended about halfway to the ground.
03:53 UTC	TORNADO	2 S Brimfield	Peoria, IL	Brief touchdown in a field, no damage reported.

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

This ground now

The live radar over the track Every 2026 tornado in Illinois Every tornado in Illinois since 1950 Warnings in force in Illinois now The forecast where you are

The other tornadoes of August 9, 2026

7 more have been surveyed in the United States that day, so far.

Date	Time	Rating	Where	Path (mi)	Width (yd)
August 9	8:27 PM CDT	Unrated	Henry, IL	0.1	10
August 9	8:54 PM CDT	Unrated	Henry, IL	0.2	10
August 9	10:02 PM CDT	EF1	Lee, IL	7.0	200
August 9	10:53 PM CDT	Unrated	Peoria, IL	0.2	0
August 9	11:16 PM CDT	EF1	LaSalle, IL	4.8	500
August 9	11:29 PM CDT	EF0	LaSalle, IL	5.1	300
August 9	11:35 PM CDT	EF1	LaSalle, IL	8.5	650

What this means

Ratings are the survey's, read off the damage rather than measured; the rating scale is above. A survey can be revised, so the rating, the path and the casualties can all still change.

Sources

NWS Damage Assessment Toolkit, the record the survey teams file from the damage, and NOAA Storm Prediction Center storm reports. Neither is the official database for 2026, which SPC publishes in the spring of 2027.