On Thursday, June 29, a powerful severe wind event moved over the region. This event was known as a derecho given its long duration from north of Kansas City to southern Indiana and its consistent strong intensity. Almost all of the damage in the area surveyed locally was due to straight-line winds, at times easily peaking between 100-120 mph in far western Illinois. Those who experienced the event conveyed how the strongest winds persisted for 10 to 15 minutes, and in some locations, it lasted as long as 20 minutes, which is atypical for derecho events.
There were some swaths of enhanced damage. These were largely due to intense wind surges in the local area. One of these in Clark county, Mo was determined to be a short-lived EF1 tornado.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 09:38:00 to 29-JUN-23 09:38:00 (CST-6)
Location: HAMILTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Very poor visibility.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 09:44:00 to 29-JUN-23 09:54:00 (CST-6)
Location: FERRIS
Magnitude: 104.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several power poles snapped near base, with estimated winds of 120 mph.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 29-JUN-23 09:58:00 to 29-JUN-23 10:08:00 (CST-6)
Location: BLANDINSVILLE
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several tree trunks snapped near the Twin Oaks Golf and Country Club. Winds estimated             near 100 MPH.

Thunderstorm Wind in WARREN, ILLINOIS
From 29-JUN-23 10:09:00 to 29-JUN-23 10:19:00 (CST-6)
Location: SWAN CREEK
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Farm outbuilding destroyed. Winds estimated near 100 MPH.

Thunderstorm Wind in WARREN, ILLINOIS
From 29-JUN-23 10:20:00 to 29-JUN-23 10:30:00 (CST-6)
Location: ROSEVILLE
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several large tree branches snapped in Roseville. Winds estimated near 100 mph.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 10:05:00 to 29-JUN-23 10:05:00 (CST-6)
Location: ADRIAN
Magnitude: 78.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Home weather station measured 90 mph wind gust. Estimated up to 100 mph winds.

Thunderstorm Wind in WARREN, ILLINOIS
From 29-JUN-23 10:09:00 to 29-JUN-23 10:19:00 (CST-6)
Location: SWAN CREEK
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Farm outbuilding destroyed. Winds estimated around 100 mph.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 29-JUN-23 10:53:00 to 29-JUN-23 10:53:00 (CST-6)
Location: (MLI) QUAD CITY ARPT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tree was blown down near Interstate 280 and the Quad City International Airport.

Thunderstorm Wind in WARREN, ILLINOIS
From 29-JUN-23 10:37:00 to 29-JUN-23 10:37:00 (CST-6)
Location: MONMOUTH MUNI ARPT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tree was blown down on the north side of Monmouth on Highway 67.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 09:55:00 to 29-JUN-23 10:05:00 (CST-6)
Location: LA HARPE
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Garage outbuilding destroyed, with winds estimate at 100 mph.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 09:56:00 to 29-JUN-23 10:06:00 (CST-6)
Location: LA HARPE
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Farm outbuilding destroyed. Winds estimated 90 to 100 mph.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 09:43:00 to 29-JUN-23 09:53:00 (CST-6)
Location: FERRIS
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Roof ripped off mobile home, 2 injuries per emergency management.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 10:02:00 to 29-JUN-23 10:22:00 (CST-6)
Location: LA HARPE
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reported snapped power poles, lots of trees down, and some barns blown over between Durham and LaHarpe. Winds were estimated over 80 miles per hour.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 10:00:00 to 29-JUN-23 10:20:00 (CST-6)
Location: CARTHAGE
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Extensive tree damage throughout town. Strong winds lasted about 20 minutes, and began about 11 am CDT.

Thunderstorm Wind in WARREN, ILLINOIS
From 29-JUN-23 10:20:00 to 29-JUN-23 10:40:00 (CST-6)
Location: ROSEVILLE
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several large tree branches snapped in Roseville. Winds estimated at 100 mph.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 29-JUN-23 10:30:00 to 29-JUN-23 10:40:00 (CST-6)
Location: BUSHNELL
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Report of lots of trees blown down in town, included pictures of metal roofing peeled off a shed.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 29-JUN-23 10:13:00 to 29-JUN-23 10:23:00 (CST-6)
Location: MACOMB
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Estimated 80 plus mph winds, with a mature evergreen snapped off at base.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 29-JUN-23 10:15:00 to 29-JUN-23 10:25:00 (CST-6)
Location: MACOMB
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tree blown onto a house. Power lines down.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 10:00:00 to 29-JUN-23 10:00:00 (CST-6)
Location: ADRIAN
Magnitude: 104.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Full size barn flattened, full size trees uprooted laying to the east.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 29-JUN-23 10:26:00 to 29-JUN-23 10:26:00 (CST-6)
Location: MACOMB
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Railroad gate snapped off by strong winds.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 29-JUN-23 10:03:00 to 29-JUN-23 10:03:00 (CST-6)
Location: BLANDINSVILLE
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public high wind gust measurement.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 09:44:00 to 29-JUN-23 09:55:00 (CST-6)
Location: ADRIAN
Magnitude: 104.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Adrian IL, communication tower bent over. Winds estimated at 120 mph.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 29-JUN-23 10:13:00 to 29-JUN-23 10:23:00 (CST-6)
Location: GOOD HOPE
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several trees damaged and trunks snapped off in Good Hope. Winds estimated near 100 mph.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 09:54:00 to 29-JUN-23 10:04:00 (CST-6)
Location: DISCO
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two 18 inch diameter trees snapped off, with numerous tree branches down. One of the worst storms to hit in 78 years of his life.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 09:43:00 to 29-JUN-23 09:53:00 (CST-6)
Location: FERRIS
Magnitude: 78.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Several trees were across roadway.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 09:45:00 to 29-JUN-23 09:55:00 (CST-6)
Location: ADRIAN
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Grain bin destroyed and rolled into a field. Winds estimated at 100 mph.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 29-JUN-23 10:16:00 to 29-JUN-23 10:31:00 (CST-6)
Location: GOOD HOPE
Magnitude: 76.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Measured 88 mph wind gust with 70 mph wind gusting during 15 minute period. RV flipped.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 09:40:00 to 29-JUN-23 09:50:00 (CST-6)
Location: NAUVOO
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Major tree damage reported around town.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 29-JUN-23 10:10:00 to 29-JUN-23 10:20:00 (CST-6)
Location: MACOMB
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Reports substantial tree damage around Western Illinois Campus in Macomb. Some powerlines blown down.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 29-JUN-23 10:05:00 to 29-JUN-23 10:15:00 (CST-6)
Location: SCIOTA
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several tree trunks snapped, with winds winds estimated near 100 mph.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 09:30:00 to 29-JUN-23 09:40:00 (CST-6)
Location: HAMILTON
Magnitude: 78.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tree snapped off, with several large branches blown down.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 29-JUN-23 10:13:00 to 29-JUN-23 10:23:00 (CST-6)
Location: GOOD HOPE
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several trees damaged and trunks snapped in Good Hope. Winds estimated near 100 MPH.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 29-JUN-23 09:58:00 to 29-JUN-23 09:58:00 (CST-6)
Location: DURHAM
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Time estimated from radar, storm chaser wind estimate.