A cold front pushing into a hot and humid airmass over eastern Iowa triggered a line of severe thunderstorms during the late evening hours on July 25, 2012.  There were many reports of 60 to 70 mph winds in this line of storms knocking down numerous trees at some locations.  There were also a couple of dime size hail reports from trained spotters.  The hardest hit area was in Buchanan county in northeast Iowa. The emergency manager reported numerous trees and tree limbs down in Quasqueton, Independence and Rowley. The power was out in Rowley. In Independence, seven 40 to 70 foot tall trees were blown down, one fell on a house. There were twenty limbs 30 to 40 feet long down and numerous branches 10 to 30 feet long down. Winds were estimated over 70 mph.  Another location with numerous trees and branches down was in Fort Madison, Iowa in Lee county.

Thunderstorm Wind in LEE, IOWA
From 25-JUL-12 23:30:00 to 25-JUL-12 23:30:00 (CST-6)
Location: FT MADISON
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters reported numerous trees and tree limbs down in Fort Madison, but some were rotten.  However, there was at least one healthy 14 inch limb down.  The damage was apparently caused by a microburst.

Thunderstorm Wind in JOHNSON, IOWA
From 25-JUL-12 22:08:00 to 25-JUL-12 22:08:00 (CST-6)
Location: OAKDALE
Magnitude: 45.00 EG
Property damage: 0.20K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a 6 foot tall tree was blown over, with several small branches down elsewhere near Oakdale.

Hail in BENTON, IOWA
From 25-JUL-12 20:21:00 to 25-JUL-12 20:21:00 (CST-6)
Location: EDGEWOOD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported pea to dime size hail near Edgewood.

Thunderstorm Wind in BUCHANAN, IOWA
From 25-JUL-12 20:24:00 to 25-JUL-12 20:24:00 (CST-6)
Location: INDEPENDENCE ARPT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a 3 inch diameter tree limb down near Independence.

Thunderstorm Wind in BUCHANAN, IOWA
From 25-JUL-12 20:24:00 to 25-JUL-12 20:24:00 (CST-6)
Location: INDEPENDENCE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported several large tree branches and power line down in Independence.

Hail in BUCHANAN, IOWA
From 25-JUL-12 20:45:00 to 25-JUL-12 20:45:00 (CST-6)
Location: ROWLEY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported dime size hail in Rowley and Quasqueton.

Thunderstorm Wind in BUCHANAN, IOWA
From 25-JUL-12 20:30:00 to 25-JUL-12 20:30:00 (CST-6)
Location: INDEPENDENCE
Magnitude: 62.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported numerous trees and tree limbs down in Quasqueton, Independence and Rowley. The power was out in Rowley. In Independence, seven 40 to 70 foot tall trees were blown down, one fell on a house.  There were twenty limbs 30 to 40 feet long down and numerous branches 10 to 30 feet long down.  Winds were estimated over 70 mph.

Thunderstorm Wind in BUCHANAN, IOWA
From 25-JUL-12 20:50:00 to 25-JUL-12 20:50:00 (CST-6)
Location: WINTHROP
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported tree limbs up to 5 inches in diameter were down near Winthrop.

Thunderstorm Wind in DELAWARE, IOWA
From 25-JUL-12 21:07:00 to 25-JUL-12 21:07:00 (CST-6)
Location: DELHI
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported trees and tree limbs down along with power lines near Delhi. Wind gusts were estimated at 70 mph.

Thunderstorm Wind in DELAWARE, IOWA
From 25-JUL-12 21:30:00 to 25-JUL-12 21:30:00 (CST-6)
Location: EARLVILLE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a barn roof blown off about 7 miles southeast of Earlville.

Thunderstorm Wind in LINN, IOWA
From 25-JUL-12 21:50:00 to 25-JUL-12 21:50:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported power lines down on the northwest side of Cedar Rapids. A traffic light was down at NW Ellis and NW Edgewood.

Thunderstorm Wind in DUBUQUE, IOWA
From 25-JUL-12 21:30:00 to 25-JUL-12 21:30:00 (CST-6)
Location: DYERSVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported tree limbs down near Dyersville.

Thunderstorm Wind in LINN, IOWA
From 25-JUL-12 22:16:00 to 25-JUL-12 22:16:00 (CST-6)
Location: MT VERNON
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported several trees blocking a road in Mount Vernon as well as a tree that fell on a house.

Thunderstorm Wind in DELAWARE, IOWA
From 25-JUL-12 20:52:00 to 25-JUL-12 20:52:00 (CST-6)
Location: RYAN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported a 60 mph wind gust near Ryan.

Thunderstorm Wind in JOHNSON, IOWA
From 25-JUL-12 21:40:00 to 25-JUL-12 21:40:00 (CST-6)
Location: SWISHER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported a 60 mph wind gust near Swisher.

Thunderstorm Wind in LINN, IOWA
From 25-JUL-12 21:44:00 to 25-JUL-12 21:44:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated a wind gust of about 70 mph about 4 miles south of Cedar Rapids.

Hail in DELAWARE, IOWA
From 25-JUL-12 20:15:00 to 25-JUL-12 20:21:00 (CST-6)
Location: EDGEWOOD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported dime size hail falling for 6 minutes near Edgewood.

Thunderstorm Wind in LINN, IOWA
From 25-JUL-12 21:45:00 to 25-JUL-12 21:45:00 (CST-6)
Location: (CID)CEDAR RAPIDS AR
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The ASOS at the Cedar Rapids Airport measured a wind gust of 61 mph.