A line of showers and thunderstorms dove southeastward across the area during the early morning hours of September 5 providing the area with high winds and brief heavy rains. Some of the storms were severe, producing damaging wind gusts over 60 mph.  Some of the hardest hit areas were Iowa City, Muscatine, Burlington, and Montrose, where tree limbs and utility poles were downed. Rainfall totals of a half inch to an inch and a quarter were common roughly northwest of a line from Fort Madison, IA to Princeton, IL with some locally higher amounts.

Thunderstorm Wind in JOHNSON, IOWA
From 05-SEP-12 02:22:00 to 05-SEP-12 02:22:00 (CST-6)
Location: IOWA CITY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts estimated to be 65 mph blew several large tree limbs down in Iowa City.  The largest limb was 12 inches in diameter.

Thunderstorm Wind in JOHNSON, IOWA
From 05-SEP-12 02:30:00 to 05-SEP-12 02:30:00 (CST-6)
Location: IOWA CITY MUNI ARPT
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts estimated to be 65 mph split an eight to ten inch diameter tree in half on the 4700 block of Chandler Court on the east side of Iowa City, IA.  Half of the tree fell to the west falling on a parked car and part of a garage.  The storm also blew down some large tree limbs along the 200 block of Hawkins Drive on the north side of the U of I Hospitals and Clinics.

Thunderstorm Wind in JOHNSON, IOWA
From 05-SEP-12 02:30:00 to 05-SEP-12 02:30:00 (CST-6)
Location: IOWA CITY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts estimated to be 65 mph blew down some large tree limbs along the 200 block of Hawkins Drive on the north side of the Iowa City UI Hospitals and Clinics in Iowa City, IA around 330 am CDT September 5.

Thunderstorm Wind in MUSCATINE, IOWA
From 05-SEP-12 02:54:00 to 05-SEP-12 02:54:00 (CST-6)
Location: MUSCATINE
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A 73 mph wind gust was recorded about 2 miles north of Muscatine, IA at 354 am CDT September 5.

Thunderstorm Wind in MUSCATINE, IOWA
From 05-SEP-12 03:00:00 to 05-SEP-12 03:00:00 (CST-6)
Location: MUSCATINE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 to 70 mph were observed 2 miles northeast of Muscatine, IA around 4 am CDT September 5.

Thunderstorm Wind in MUSCATINE, IOWA
From 05-SEP-12 03:15:00 to 05-SEP-12 03:15:00 (CST-6)
Location: MUSCATINE
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 62 mph wind gust was measured on the north side of Muscatine, IA on Highway 38 around 415 am CDT September 5.

Thunderstorm Wind in DES MOINES, IOWA
From 05-SEP-12 03:50:00 to 05-SEP-12 03:50:00 (CST-6)
Location: MEDIAPOLIS
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts estimated to be 65 mph blew a large tree limb down in Mediapolis, IA around 450 am CDT September 5.

Thunderstorm Wind in DES MOINES, IOWA
From 05-SEP-12 04:02:00 to 05-SEP-12 04:02:00 (CST-6)
Location: WEST BURLINGTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts estimated to be 60 mph blew down some 4 to 5 inch diameter tree limbs near the 200 block of Leffler Street in West Burlington, IA at 502 am CDT September 5.  Some limbs were live and some were dead.

Thunderstorm Wind in LEE, IOWA
From 05-SEP-12 04:34:00 to 05-SEP-12 04:34:00 (CST-6)
Location: MONTROSE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts estimated to be 70 mph topped off a 6 inch diameter tree near the library in Montrose, IA at 534 am CDT September 5.

Thunderstorm Wind in DES MOINES, IOWA
From 05-SEP-12 04:02:00 to 05-SEP-12 04:02:00 (CST-6)
Location: LENOX PARK
Magnitude: 61.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts estimated to be 70 mph broke a power pole off near the Burlington Bees baseball park in Burlington, IA at 502 am CDT September 5.

Hail in DUBUQUE, IOWA
From 05-SEP-12 02:06:00 to 05-SEP-12 02:06:00 (CST-6)
Location: ASBURY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Non-severe dime sized hail fell 4 miles west northwest of Dubuque, IA at 306 am CDT September 5.

Thunderstorm Wind in LINN, IOWA
From 05-SEP-12 02:15:00 to 05-SEP-12 02:15:00 (CST-6)
Location: MT VERNON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts estimated to be 70 mph blew a tree down in Mount Vernon, IA around 315 am CDT September 5.

Thunderstorm Wind in JOHNSON, IOWA
From 05-SEP-12 02:22:00 to 05-SEP-12 02:22:00 (CST-6)
Location: IOWA CITY MUNI ARPT
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A 66 mph wind gust was recorded by the ASOS at the Iowa City Municipal Airport at 322 am CDT September 5.