Thunderstorm winds caused widespread damage in part of northwest Iowa, especially in the Spirit Lake and Okoboji areas in Dickinson County, during the late evening of July 17th. The thunderstorms also caused flash flooding at Spirit lake.

Thunderstorm Wind in DICKINSON, IOWA
From 17-JUL-10 21:40:00 to 17-JUL-10 21:40:00 (CST-6)
Location: WEST OKOBOJI
Magnitude: 61.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds damaged several boats and docks at Terrace Park Beach. The winds also blew down trees and power lines, resulting in power outages.

Thunderstorm Wind in DICKINSON, IOWA
From 17-JUL-10 21:40:00 to 17-JUL-10 21:40:00 (CST-6)
Location: TRIBOJI BEACH
Magnitude: 61.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused widespread tree, power pole, and power line damage, with resulting power outages. Some roads were blocked by fallen trees, and a few vehicles sustained minor damage from tree debris.

Thunderstorm Wind in CLAY, IOWA
From 17-JUL-10 21:50:00 to 17-JUL-10 21:50:00 (CST-6)
Location: FOSTORIA
Magnitude: 70.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds caused widespread tree and power line damage. Shingles were blown off roofs, and several roofs and vehicles were damaged by tree debris.

Thunderstorm Wind in DICKINSON, IOWA
From 17-JUL-10 22:00:00 to 17-JUL-10 22:00:00 (CST-6)
Location: TERRIL
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: Broadcast Media

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

Thunderstorm Wind in DICKINSON, IOWA
From 17-JUL-10 22:00:00 to 17-JUL-10 22:00:00 (CST-6)
Location: LAKE PARK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm wind gusts to 60 mph were accompanied by half inch diameter hail.

Flash Flood in DICKINSON, IOWA
From 17-JUL-10 22:05:00 to 18-JUL-10 00:30:00 (CST-6)
Location: SPIRIT LAKE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain caused flash flooding of numerous streets.

Thunderstorm Wind in DICKINSON, IOWA
From 17-JUL-10 21:20:00 to 17-JUL-10 21:20:00 (CST-6)
Location: LAKE PARK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds caused tree damage, including numerous branches blown down.

Thunderstorm Wind in DICKINSON, IOWA
From 17-JUL-10 21:20:00 to 17-JUL-10 21:24:00 (CST-6)
Location: LAKE PARK
Magnitude: 70.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds caused widespread tree and power line damage, including numerous large trees blown down, and a half mile of large transmission lines blown down. Several vehicles and a few buildings were damaged by falling trees and tree debris, and some roads were blocked. The winds were accompanied by small hail.

Thunderstorm Wind in CLAY, IOWA
From 17-JUL-10 22:20:00 to 17-JUL-10 22:20:00 (CST-6)
Location: DICKENS
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused an unknown amount of tree damage.

Thunderstorm Wind in DICKINSON, IOWA
From 17-JUL-10 21:24:00 to 17-JUL-10 21:24:00 (CST-6)
Location: MONTGOMERY
Magnitude: 70.00 EG
Property damage: 100.00K
Reported by: Emergency Manager

Thunderstorm winds caused widespread tree damage, including numerous trees blown down. Several buildings and vehicles were damaged by falling trees and tree debris, including one house which had its roof split open. The winds also destroyed a Morton Building. The winds caused an unknown amount of damage to crops in the area, especially corn.

Lightning in DICKINSON, IOWA
From 17-JUL-10 21:24:00 to 17-JUL-10 21:24:00 (CST-6)
Location: MILFORD
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Lightning struck a house and caused a small fire.

Thunderstorm Wind in DICKINSON, IOWA
From 17-JUL-10 21:25:00 to 17-JUL-10 21:28:00 (CST-6)
Location: MONTGOMERY
Magnitude: 84.00 MG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds caused widespread tree and power line damage, and caused a power outage. The winds damaged several buildings, including shingles blown off several homes and businesses. Several sheds and shelters were destroyed, and debris was scattered over a large area.  Several grain bins were destroyed at a farm.

Thunderstorm Wind in DICKINSON, IOWA
From 17-JUL-10 21:35:00 to 17-JUL-10 21:35:00 (CST-6)
Location: OKOBOJI
Magnitude: 64.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm winds caused widespread tree and power line damage. Several large trees were blown down, blocking some roads, and downed power lines resulted in power outages. A few buildings and vehicles were damaged by falling trees or tree debris.

Thunderstorm Wind in DICKINSON, IOWA
From 17-JUL-10 21:40:00 to 17-JUL-10 21:40:00 (CST-6)
Location: ARNOLDS PARK
Magnitude: 70.00 EG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds caused widespread tree and power line damage, with resulting power outages. The tree damage included several large trees blown down. Power poles and light poles were also blown down. Some vehicles and homes sustained damage from falling trees and tree debris. Several rides were damaged at Arnolds Park Amusement Park. Docks, boat hoists, and several boats were damaged along the shore of Lake Okoboji.

Thunderstorm Wind in CLAY, IOWA
From 17-JUL-10 22:40:00 to 17-JUL-10 22:40:00 (CST-6)
Location: SPENCER
Magnitude: 61.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds caused tree damage, including a large tree that fell on and damaged a house.

Thunderstorm Wind in CLAY, IOWA
From 17-JUL-10 23:45:00 to 17-JUL-10 23:45:00 (CST-6)
Location: MACLAY
Magnitude: 70.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds destroyed a barn, and spread the debris across several fields.

Thunderstorm Wind in BUENA VISTA, IOWA
From 17-JUL-10 23:50:00 to 17-JUL-10 23:50:00 (CST-6)
Location: MARATHON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds caused tree damage, including several trees blown down. The winds were accompanied by heavy rain.

Thunderstorm Wind in DICKINSON, IOWA
From 17-JUL-10 21:48:00 to 17-JUL-10 21:48:00 (CST-6)
Location: FULLER FLD ARPT
Magnitude: 61.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds caused widespread tree damage, with several large trees blown down, and many streets block or littered by tree debris. The winds also blew down power lines, resulting in a power outage. Several boats and boat hoists were heavily damaged.

Thunderstorm Wind in DICKINSON, IOWA
From 17-JUL-10 21:20:00 to 17-JUL-10 21:40:00 (CST-6)
Location: MONTGOMERY
Magnitude: 70.00 EG
Property damage: 100.00K
Crop damage: 400.00K
Reported by: Newspaper

Thunderstorm winds caused significant damage to crops, especially corn, according to the county farm Service Agency director. The winds also destroyed or damaged several small farm buildings and shelters.

Thunderstorm Wind in DICKINSON, IOWA
From 17-JUL-10 21:24:00 to 17-JUL-10 21:24:00 (CST-6)
Location: LAKE PARK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds caused tree damage.