Thunderstorms produced damaging winds in a few locations in northwest Iowa from a little before to just after midnight on the night of July 20th and 21st. The greatest damage was in and near Sioux City.

Lightning in PLYMOUTH, IOWA
From 21-JUL-08 02:00:00 to 21-JUL-08 02:00:00 (CST-6)
Location: LE MARS
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning struck and destroyed a large tree and an electrical panel on the side of a house, blowing several breakers and fuse boxes, melting a telephone wire, and damaging other parts of the house's electrical system. The strike also shattered a bedroom window, causing minor cuts from flying glass to two occupants.

Thunderstorm Wind in IDA, IOWA
From 21-JUL-08 00:30:00 to 21-JUL-08 00:30:00 (CST-6)
Location: BATTLE CREEK
Magnitude: 57.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage, including branches blown down.

Thunderstorm Wind in PLYMOUTH, IOWA
From 20-JUL-08 23:00:00 to 20-JUL-08 23:00:00 (CST-6)
Location: MILLNERVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WOODBURY, IOWA
From 20-JUL-08 23:39:00 to 20-JUL-08 23:39:00 (CST-6)
Location: (SUX)SIOUX CITY ARPT
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in WOODBURY, IOWA
From 20-JUL-08 23:43:00 to 20-JUL-08 23:43:00 (CST-6)
Location: SALIX
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WOODBURY, IOWA
From 21-JUL-08 00:05:00 to 21-JUL-08 00:05:00 (CST-6)
Location: MOVILLE
Magnitude: 61.00 EG
Property damage: 0.50M
Reported by: Trained Spotter

Thunderstorm winds caused widespread tree damage, including several trees blown down. The winds also destroyed two machine sheds, damaged roofs and siding on homes, blew down power lines, and damaged equipment at a construction project. The winds flattened some crops in the area, but the amount of crop damage was not known.

Thunderstorm Wind in WOODBURY, IOWA
From 20-JUL-08 23:28:00 to 20-JUL-08 23:45:00 (CST-6)
Location: SIOUX CITY
Magnitude: 81.00 MG
Property damage: 5.00M
Reported by: Trained Spotter

Thunderstorm winds caused widespread damage in and near Sioux City. Tree damage included large trees blown down, blocking several roads. A few vehicles were destroyed and numerous vehicles damaged by falling trees and tree debris. Falling trees also damaged several residences and garages, causing one known injury. The winds lifted a three car garage off its foundation, and overturned it onto a nearby pasture. One large tree split an occupied trailer in the middle, missing residents who were sleeping at both ends. Numerous power lines and poles were blown down or broken, leaving an estimated 19,000 customers without power, several thousand of which were still without power 24 hours later. Numerous buildings, especially residences, sustained roof damage, especially to shingles. The winds damaged or blew down several signs, damaged fences, and blew down a large awning that sheltered gasoline pumps at a convenience store. The winds flattened crops near the city, but the amount of crop damage was not known, especially since crops were expected to partially recover.