Thunderstorms produced damaging winds over a large part of northwest Iowa, especially near the western border of the state, during the predawn hours of June 11th. The storms also produced very heavy rain, which caused flash flooding at several locations.

Thunderstorm Wind in WOODBURY, IOWA
From 11-JUN-10 01:53:00 to 11-JUN-10 01:53:00 (CST-6)
Location: SERGEANT BLUFF
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WOODBURY, IOWA
From 11-JUN-10 02:04:00 to 11-JUN-10 02:04:00 (CST-6)
Location: SALIX
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew shingles off a roof and caused tree damage, including large branches blown down.

Thunderstorm Wind in WOODBURY, IOWA
From 11-JUN-10 02:20:00 to 11-JUN-10 02:20:00 (CST-6)
Location: MOVILLE
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Insurance Company

Thunderstorm winds damaged a large fabric outbuilding.

Thunderstorm Wind in WOODBURY, IOWA
From 11-JUN-10 01:49:00 to 11-JUN-10 01:49:00 (CST-6)
Location: (SUX)SIOUX CITY ARPT
Magnitude: 65.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds blew over a large tractor trailer onto an ammonia truck at a truck stop.

Flash Flood in WOODBURY, IOWA
From 11-JUN-10 02:25:00 to 11-JUN-10 05:15:00 (CST-6)
Location: LEEDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain caused flash flooding of streets and some basements. The force of the urban flooding popped off manhole covers.

Thunderstorm Wind in LYON, IOWA
From 11-JUN-10 02:30:00 to 11-JUN-10 02:30:00 (CST-6)
Location: ROCK RAPIDS
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage, including several trees blown down.

Thunderstorm Wind in WOODBURY, IOWA
From 11-JUN-10 02:30:00 to 11-JUN-10 02:30:00 (CST-6)
Location: PIERSON
Magnitude: 65.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew thew roof off a business.

Thunderstorm Wind in IDA, IOWA
From 11-JUN-10 03:05:00 to 11-JUN-10 03:05:00 (CST-6)
Location: GALVA
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage, including several large trees blown down.

Thunderstorm Wind in WOODBURY, IOWA
From 11-JUN-10 01:50:00 to 11-JUN-10 01:50:00 (CST-6)
Location: SIOUX CITY
Magnitude: 61.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds caused widespread tree damage, including several trees blown down. The winds also blew down power lines.

Thunderstorm Wind in LYON, IOWA
From 11-JUN-10 01:55:00 to 11-JUN-10 01:55:00 (CST-6)
Location: INWOOD
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds destroyed a machine shed and caused tree damage, including several trees blown down.

Thunderstorm Wind in SIOUX, IOWA
From 11-JUN-10 02:02:00 to 11-JUN-10 02:02:00 (CST-6)
Location: IRETON
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: County Official

Thunderstorm winds damaged five grain bins.