Strong thunderstorms initiated well to the west of the area the previous night, primarily in western South Dakota, and proceeded to track east southeast through the morning towards northern Iowa.  By the afternoon, instability had picked up to around 3000-4000 J/kg MUCAPE with 50+ kts of effective bulk shear.  The result was a strong and damaging wind producing MCS that moved across north-central and northeast Iowa which produced a number of wind damage and wind gust reports.

Thunderstorm Wind in KOSSUTH, IOWA
From 19-JUL-17 14:55:00 to 19-JUL-17 14:55:00 (CST-6)
Location: SWEA CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated winds at 60 to 65 mph.  Also report lots of small tree branches down.

Thunderstorm Wind in WINNEBAGO, IOWA
From 19-JUL-17 15:01:00 to 19-JUL-17 15:01:00 (CST-6)
Location: RAKE
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

County dispatch reported trees and power lines down.  This is a delayed report and times is estimated from radar.

Thunderstorm Wind in WINNEBAGO, IOWA
From 19-JUL-17 15:07:00 to 19-JUL-17 15:07:00 (CST-6)
Location: BUFFALO CENTER
Magnitude: 56.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

County dispatch reported multiple trees down and power line damage in town.  This is a delayed report and time estimated from radar.

Thunderstorm Wind in WORTH, IOWA
From 19-JUL-17 15:39:00 to 19-JUL-17 15:39:00 (CST-6)
Location: NORTHWOOD
Magnitude: 61.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

County dispatch reported a transformer blown, power lines and power poles down, and tree damage.  This is a delayed report and time estimated from radar.

Thunderstorm Wind in WORTH, IOWA
From 19-JUL-17 15:40:00 to 19-JUL-17 15:40:00 (CST-6)
Location: KENSETT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

County dispatch reported significant tree damage in town.  This is a delayed report and time estimated from radar.

Thunderstorm Wind in WINNEBAGO, IOWA
From 19-JUL-17 15:23:00 to 19-JUL-17 15:23:00 (CST-6)
Location: LELAND
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

County dispatch reported multiple trees down and power line damage in town.  This is delayed report and time estimated from radar.

Thunderstorm Wind in WINNEBAGO, IOWA
From 19-JUL-17 15:25:00 to 19-JUL-17 15:25:00 (CST-6)
Location: LAKE MILLS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

County dispatch reported trees down in town.  This is a delayed report and time estimated from radar.

Thunderstorm Wind in CERRO GORDO, IOWA
From 19-JUL-17 15:46:00 to 19-JUL-17 15:46:00 (CST-6)
Location: MASON CITY
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported multiple locations with trees down in Mason City.  This is a delayed report and time estimated from radar.

Thunderstorm Wind in WORTH, IOWA
From 19-JUL-17 15:33:00 to 19-JUL-17 15:33:00 (CST-6)
Location: HANLONTOWN
Magnitude: 56.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Law Enforcement

County dispatch reported overturned semis along I-35 around mile markers 203, 205, 207, and 208.  This is a delayed report and time estimated from radar.

Thunderstorm Wind in WORTH, IOWA
From 19-JUL-17 15:37:00 to 19-JUL-17 15:37:00 (CST-6)
Location: HANLONTOWN
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reports semis blown over on I-35 near Highway 9.  This is a delayed report and time estimated from radar.

Thunderstorm Wind in WORTH, IOWA
From 19-JUL-17 15:40:00 to 19-JUL-17 15:40:00 (CST-6)
Location: HANLONTOWN
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Iowa DOT RWIS in Hanlontown recorded a 60 mph wind gust.

Thunderstorm Wind in CERRO GORDO, IOWA
From 19-JUL-17 15:45:00 to 19-JUL-17 15:45:00 (CST-6)
Location: (MCW)MASON CITY MUNI
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Mason City Municipal Airport recorded a 63 mph wind gust.

Thunderstorm Wind in WINNEBAGO, IOWA
From 19-JUL-17 15:15:00 to 19-JUL-17 15:15:00 (CST-6)
Location: THOMPSON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported an evergreen tree uprooted in their yard.  This is a delayed report and time estimated from radar.

Thunderstorm Wind in WINNEBAGO, IOWA
From 19-JUL-17 15:23:00 to 19-JUL-17 15:23:00 (CST-6)
Location: FOREST CITY
Magnitude: 61.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

County dispatch reported multiple broken windows, power lines down, and trees downed in town.  Time estimated from radar and this is a delayed report.

Thunderstorm Wind in KOSSUTH, IOWA
From 19-JUL-17 14:57:00 to 19-JUL-17 14:57:00 (CST-6)
Location: LEDYARD
Magnitude: 61.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Social Media

Public relayed pictures via twitter of trees snapped and other tree damage in the Ledyard area.  Time estimated by radar and this is a delayed report.

Thunderstorm Wind in HANCOCK, IOWA
From 19-JUL-17 15:35:00 to 19-JUL-17 15:35:00 (CST-6)
Location: MILLER
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Forest City Airport AWOS recorded a 66 mph wind gust.

Thunderstorm Wind in CERRO GORDO, IOWA
From 19-JUL-17 15:39:00 to 19-JUL-17 15:39:00 (CST-6)
Location: CLEAR LAKE
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Dispatch reported numerous trees down and power lines down. This is a delayed report and time estimated from radar.

Thunderstorm Wind in BREMER, IOWA
From 19-JUL-17 16:45:00 to 19-JUL-17 16:45:00 (CST-6)
Location: SUMNER
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

KWWL reported via twitter of trees and power lines down in Sumner.  Time estimated from radar.

Thunderstorm Wind in CERRO GORDO, IOWA
From 19-JUL-17 15:48:00 to 19-JUL-17 15:48:00 (CST-6)
Location: PLYMOUTH
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio operator reported trees down in Plymouth.  Report came through social media.  Time estimated from radar.

Thunderstorm Wind in WORTH, IOWA
From 19-JUL-17 15:41:00 to 19-JUL-17 15:41:00 (CST-6)
Location: MANLY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported trees down in Manly.  This is a delayed report and time estimated from radar.

Thunderstorm Wind in WORTH, IOWA
From 19-JUL-17 15:33:00 to 19-JUL-17 15:33:00 (CST-6)
Location: FERTILE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

County dispatch reported trees down and power outages in town.  This is a delayed report and time estimated from radar.