Thunderstorms produced several reports of large hail and damaging winds over the northwest corner of Iowa just before and just after midnight on August 22nd and 23rd.

Hail in LYON, IOWA
From 22-AUG-11 23:10:00 to 22-AUG-11 23:10:00 (CST-6)
Location: ROCK RAPIDS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Large hail, driving by wind gusts to 60 mph, caused an unknown amount of crop damage in the area.

Thunderstorm Wind in LYON, IOWA
From 22-AUG-11 23:50:00 to 22-AUG-11 23:50:00 (CST-6)
Location: LITTLE ROCK
Magnitude: 52.00 EG
Property damage: 10.00K
Reported by: Newspaper

Thunderstorm winds caused tree damage, including large branches and a few trees blown down. Some trees and branches fell on homes and in yards, and some roads were blocked. The winds were accompanied by small hail. There was crop damage from the winds and hail in the area, but the amount of crop damage was not known.

Hail in SIOUX, IOWA
From 22-AUG-11 23:10:00 to 22-AUG-11 23:10:00 (CST-6)
Location: HULL
Magnitude: 1.50 
Property damage: 0.00K
Reported by: Trained Spotter

Large hail caused an unknown amount of damage to corn and soybean crops.

Hail in SIOUX, IOWA
From 22-AUG-11 23:30:00 to 22-AUG-11 23:30:00 (CST-6)
Location: BOYDEN
Magnitude: 1.50 
Property damage: 0.00K
Reported by: Trained Spotter

Large hail caused an unknown amount of damage to corn and soybean crops.

Hail in O'BRIEN, IOWA
From 22-AUG-11 23:35:00 to 22-AUG-11 23:35:00 (CST-6)
Location: SHELDON
Magnitude: 1.75 
Property damage: 25.00K
Reported by: Broadcast Media

Golf ball size hail damaged vehicles and windows, and also caused an unknown amount of damage to crops in the area.

Hail in OSCEOLA, IOWA
From 22-AUG-11 23:58:00 to 22-AUG-11 23:58:00 (CST-6)
Location: ASHTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail was accompanied by estimated 60 mph wind gusts.

Thunderstorm Wind in OSCEOLA, IOWA
From 22-AUG-11 23:58:00 to 22-AUG-11 23:58:00 (CST-6)
Location: ASHTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage, including up to 3 inch diameter branches blown down. The winds were accompanied by quarter size hail.

Thunderstorm Wind in O'BRIEN, IOWA
From 23-AUG-11 00:06:00 to 23-AUG-11 00:06:00 (CST-6)
Location: SANBORN
Magnitude: 61.00 EG
Property damage: 100.00K
Reported by: Law Enforcement

Thunderstorm winds caused widespread tree and power line damage in Sanborn. Large trees were blown down or uprooted, and numerous large branches were blown down. Tree debris block several roads. Some homes were damaged by falling trees and tree debris. Power lines and poles were blown down, including two large transmission line towers. A power outage resulted from the damage. The winds also caused an unknown amount of damage to area crops, especially corn.

Thunderstorm Wind in O'BRIEN, IOWA
From 23-AUG-11 00:30:00 to 23-AUG-11 00:30:00 (CST-6)
Location: SUTHERLAND
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds destroyed two grain bins and caused tree damage.

Thunderstorm Wind in LYON, IOWA
From 22-AUG-11 23:10:00 to 22-AUG-11 23:10:00 (CST-6)
Location: ROCK RAPIDS
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds caused tree damage, including numerous branches blown down. A few large branches fell on homes. The winds were accompanied by quarter size hail.