A thunderstorm complex developed ahead of a storm system developing in the northern plains.  The complex moved southeastward into eastern Iowa after daybreak on the 21st producing heavy rainfall, up to golf ball sized hail, and strong gusty winds north of a line from Cedar Rapids to Dubuque.

Thunderstorm Wind in BENTON, IOWA
From 21-JUN-13 08:08:00 to 21-JUN-13 08:08:00 (CST-6)
Location: URBANA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Emergency Manager reported winds of 60 to 65 mph winds with damage to small trees and limbs were down.

Thunderstorm Wind in BUCHANAN, IOWA
From 21-JUN-13 08:13:00 to 21-JUN-13 08:13:00 (CST-6)
Location: QUASQUETON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported tree limbs of 2 to 5 inches were down and estimated the wind speed to be around 55 mph.

Thunderstorm Wind in LINN, IOWA
From 21-JUN-13 08:37:00 to 21-JUN-13 08:37:00 (CST-6)
Location: ALBURNETT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Local broadcast media estimated wind speeds of 55 to 60 mph.

Thunderstorm Wind in CEDAR, IOWA
From 21-JUN-13 09:45:00 to 21-JUN-13 09:45:00 (CST-6)
Location: STANWOOD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated thunderstorm wind gusts of 60 mph.

Thunderstorm Wind in BUCHANAN, IOWA
From 21-JUN-13 08:06:00 to 21-JUN-13 08:06:00 (CST-6)
Location: QUASQUETON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Emergency Manager estimated wind speeds of 50 to 60 mph.

Hail in BUCHANAN, IOWA
From 21-JUN-13 07:29:00 to 21-JUN-13 07:29:00 (CST-6)
Location: AURORA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

In addition, thunderstorm wind speeds were estimated between 40 and 50 mph.

Thunderstorm Wind in LINN, IOWA
From 21-JUN-13 09:03:00 to 21-JUN-13 09:03:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated wind gusts over 60 mph with the storms.

Thunderstorm Wind in BUCHANAN, IOWA
From 21-JUN-13 09:00:00 to 21-JUN-13 09:00:00 (CST-6)
Location: QUASQUETON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several trees and large branches 4 to 12 inches in diameter were blown down along with a dozen shingles blown off of the house. There were also two skylights broken out. The report was delayed and the time was estimated using radar.

Hail in BUCHANAN, IOWA
From 21-JUN-13 07:43:00 to 21-JUN-13 07:43:00 (CST-6)
Location: OTTERVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Pea to quarter sized hail was reported in the area.

Hail in BUCHANAN, IOWA
From 21-JUN-13 07:42:00 to 21-JUN-13 07:42:00 (CST-6)
Location: INDEPENDENCE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in DELAWARE, IOWA
From 21-JUN-13 07:51:00 to 21-JUN-13 07:51:00 (CST-6)
Location: COLESBURG
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in DELAWARE, IOWA
From 21-JUN-13 08:00:00 to 21-JUN-13 08:00:00 (CST-6)
Location: MANCHESTER ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in BUCHANAN, IOWA
From 21-JUN-13 08:06:00 to 21-JUN-13 08:06:00 (CST-6)
Location: QUASQUETON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in BENTON, IOWA
From 21-JUN-13 07:52:00 to 21-JUN-13 07:52:00 (CST-6)
Location: URBANA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated wind speeds of 50 to 60 mph.

Thunderstorm Wind in DELAWARE, IOWA
From 21-JUN-13 07:54:00 to 21-JUN-13 07:54:00 (CST-6)
Location: BACKBONE STATE PARK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Emergency Manager reported limbs were down and that awnings were damaged as the storm moved through.