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 JEFFERSON, IOWA
From 29-JUN-23 09:37:00 to 29-JUN-23 09:37:00 (CST-6)
Location: FAIRFIELD
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Power out, with 3 trees blown down.

Thunderstorm Wind in LEE, IOWA
From 29-JUN-23 09:45:00 to 29-JUN-23 09:45:00 (CST-6)
Location: KEOKUK
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees blown down on Rainbow Drive.

Thunderstorm Wind in LEE, IOWA
From 29-JUN-23 09:40:00 to 29-JUN-23 09:50:00 (CST-6)
Location: MONTROSE
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Trees and power line were reported down, with estimated 70 to 80 mph winds.

Thunderstorm Wind in WASHINGTON, IOWA
From 29-JUN-23 10:00:00 to 29-JUN-23 10:00:00 (CST-6)
Location: WASHINGTON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown down, onto a power line.

Thunderstorm Wind in LEE, IOWA
From 29-JUN-23 09:35:00 to 29-JUN-23 09:35:00 (CST-6)
Location: KEOKUK ARPT
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Keokuk Airport AWOS reported this gust.

Thunderstorm Wind in LEE, IOWA
From 29-JUN-23 09:53:00 to 29-JUN-23 09:53:00 (CST-6)
Location: FT MADISON
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Estimated 80 mph winds with tree limbs down.

Thunderstorm Wind in SCOTT, IOWA
From 29-JUN-23 11:20:00 to 29-JUN-23 11:20:00 (CST-6)
Location: SCOTT COUNTY PARK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Several large tree branches were reported down on the same street on the south edge of Park View. Branches were 2 to 6 inches in diameter, and from healthy trees.

Thunderstorm Wind in LEE, IOWA
From 29-JUN-23 09:30:00 to 29-JUN-23 09:40:00 (CST-6)
Location: KEOKUK
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency Management reported widespread tree damage, with many down or snapped on houses, many buildings had damage or destroyed. Highway signs blown off, leaving posts behind. Widespread power outages.

Thunderstorm Wind in LEE, IOWA
From 29-JUN-23 09:35:00 to 29-JUN-23 09:45:00 (CST-6)
Location: KEOKUK
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

NWS storm survey found damage consistent with 100 mph straight-line winds. Damage was to dozens of large trees, downed utility poles, and a nearly destroyed outbuilding. A roof was off a home, and a couple mobile homes were severely damaged on the north side of Keokuk.

Thunderstorm Wind in LEE, IOWA
From 29-JUN-23 09:40:00 to 29-JUN-23 09:50:00 (CST-6)
Location: MONTROSE
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

NWS Storm Survey found damage to dozens of large trees and utility poles consistent
with peak wind gusts of 90 to 100 mph throughout the town.

Thunderstorm Wind in LEE, IOWA
From 29-JUN-23 09:32:00 to 29-JUN-23 09:42:00 (CST-6)
Location: MOOAR
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Estimated 70 to 80 mph wind gusts.

Thunderstorm Wind in JEFFERSON, IOWA
From 29-JUN-23 08:47:00 to 29-JUN-23 08:47:00 (CST-6)
Location: BATAVIA
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees reported blown down.

Thunderstorm Wind in JEFFERSON, IOWA
From 29-JUN-23 08:47:00 to 29-JUN-23 08:47:00 (CST-6)
Location: BATAVIA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported winds around 60 mph.