A stalled boundary combined with an upper disturbance to produce a large convective event started in the afternoon and lasting numerous hours producing very heavy rains, flash flooding, dozens of reports of damaging winds of 60 to over 70 mph, and some large hail reports lasting well into the night.

Thunderstorm Wind in HENRY, IOWA
From 20-JUL-17 18:10:00 to 20-JUL-17 18:10:00 (CST-6)
Location: ROME
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported downed tree limbs and power lines.

Thunderstorm Wind in SCOTT, IOWA
From 20-JUL-17 21:17:00 to 20-JUL-17 21:17:00 (CST-6)
Location: DAVENPORT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported large tree limbs were down.

Thunderstorm Wind in HENRY, IOWA
From 20-JUL-17 18:11:00 to 20-JUL-17 18:11:00 (CST-6)
Location: MT PLEASANT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter in Mt Pleasant reported a large tree branch was down in town near the McDonald's restaurant.

Thunderstorm Wind in HENRY, IOWA
From 20-JUL-17 18:28:00 to 20-JUL-17 18:28:00 (CST-6)
Location: MT PLEASANT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A public report was received of a large barn blown over via the KWQC Facebook page.

Thunderstorm Wind in SCOTT, IOWA
From 20-JUL-17 21:19:00 to 20-JUL-17 21:19:00 (CST-6)
Location: DAVENPORT ARPT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A NWS employee reported trees down in the local area.

Thunderstorm Wind in SCOTT, IOWA
From 20-JUL-17 21:39:00 to 20-JUL-17 21:39:00 (CST-6)
Location: PRINCETON
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A NWS employee reported a tree was uprooted.

Hail in HENRY, IOWA
From 20-JUL-17 18:09:00 to 20-JUL-17 18:09:00 (CST-6)
Location: MT PLEASANT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

This report of hail up to the size of quarters was received from local amateur radio operators.

Thunderstorm Wind in HENRY, IOWA
From 20-JUL-17 18:11:00 to 20-JUL-17 18:11:00 (CST-6)
Location: MT PLEASANT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter in Mt Pleasant reported estimated winds up to 60 mph.

Thunderstorm Wind in HENRY, IOWA
From 20-JUL-17 18:23:00 to 20-JUL-17 18:23:00 (CST-6)
Location: MT PLEASANT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a dumpster was flipped over and a fence was down near a hotel.

Hail in HENRY, IOWA
From 20-JUL-17 18:40:00 to 20-JUL-17 18:40:00 (CST-6)
Location: OAKLAND MILLS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in HENRY, IOWA
From 20-JUL-17 18:50:00 to 20-JUL-17 18:50:00 (CST-6)
Location: MT PLEASANT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a large road detour sign was flipped over along with a piece of a fence blown down.

Thunderstorm Wind in JEFFERSON, IOWA
From 20-JUL-17 19:32:00 to 20-JUL-17 19:32:00 (CST-6)
Location: LOCKRIDGE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A public report was received of downed power lines.

Thunderstorm Wind in SCOTT, IOWA
From 20-JUL-17 21:19:00 to 20-JUL-17 21:19:00 (CST-6)
Location: DAVENPORT ARPT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A NWS employee estimated wind gusts up to 70 mph.

Thunderstorm Wind in SCOTT, IOWA
From 20-JUL-17 21:29:00 to 20-JUL-17 21:29:00 (CST-6)
Location: DAVENPORT ARPT
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

A public report was received of winds damaging a metal building.

Hail in MUSCATINE, IOWA
From 20-JUL-17 20:40:00 to 20-JUL-17 20:40:00 (CST-6)
Location: MONTPELIER
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in SCOTT, IOWA
From 20-JUL-17 21:23:00 to 20-JUL-17 21:23:00 (CST-6)
Location: PLEASANT VLY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A public report was received of a large tree branch down, blocking the sidewalk near the I-74 and I-80 intersection.   This report was received via social media.

Thunderstorm Wind in SCOTT, IOWA
From 20-JUL-17 21:29:00 to 20-JUL-17 21:29:00 (CST-6)
Location: DAVENPORT ARPT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

This wind gust of 61 mph was measured by the Davenport Airport ASOS site.

Flash Flood in HENRY, IOWA
From 20-JUL-17 18:16:00 to 20-JUL-17 21:16:00 (CST-6)
Location: MT PLEASANT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported torrential rain with water getting into the hotel building in town.

Flash Flood in HENRY, IOWA
From 20-JUL-17 19:30:00 to 20-JUL-17 22:30:00 (CST-6)
Location: MT PLEASANT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported numerous streets in town were inundated with water. One vehicle was disabled by water in 500 block of Lincoln Street and towed away.