A cold front stretching across the upper Midwest, coupled with warm moist air streaming northward across the area, brought scattered showers and isolated thunderstorms to portions of east central Iowa and northern Illinois during the midday hours August 9. Some locations along the Highway 20 corridor saw rainfall amounts ranging from 1 to 2 inches from these storms. Afternoon high temperatures were in the upper 80s to lower 90s.
By late afternoon, showers and thunderstorms began to redevelop along the cold front in western Iowa and spread eastward into the Mid-Mississippi Valley.
During the evening hours, these storms brought widespread rain to the Mid-Mississippi Valley. In addition, several of these storms became severe over eastern Iowa producing winds gusts from 50 to 80 mph around the Cedar Rapids Area.

Thunderstorm Wind in BENTON, IOWA
From 09-AUG-09 18:45:00 to 09-AUG-09 18:45:00 (CST-6)
Location: KEYSTONE
Magnitude: 70.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 80 mph blew down several 1.5 foot diameter trees and 3 to 6 inch diameter tree limbs, moved and overturned some grain wagons about 100 yards, blew away some mail boxes, and ripped the doors off a house and barn about 4 miles southwest of Van Horne, IA around 745 pm August 9.

Thunderstorm Wind in BENTON, IOWA
From 09-AUG-09 18:47:00 to 09-AUG-09 18:47:00 (CST-6)
Location: NORWAY
Magnitude: 74.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An 85 mph wind gust was measured in Norway, IA around 747 pm August 9.

Thunderstorm Wind in BENTON, IOWA
From 09-AUG-09 18:51:00 to 09-AUG-09 18:51:00 (CST-6)
Location: VAN HORNE
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 58 mph wind gust was measured about 2 miles northwest of Van Horne, IA around 751 pm August 9.

Thunderstorm Wind in BENTON, IOWA
From 09-AUG-09 18:35:00 to 09-AUG-09 18:35:00 (CST-6)
Location: NEWHALL
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 75 mph snapped a 4 to 5 foot diameter oak tree off at the base near the intersection of Highway 30 and Highway 218 about 4 miles west southwest of New Hall, IA around 735 pm August 9.

Thunderstorm Wind in BENTON, IOWA
From 09-AUG-09 18:38:00 to 09-AUG-09 18:38:00 (CST-6)
Location: NORWAY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 70 mph were observed in Norway, IA around 738 pm August 9.

Thunderstorm Wind in BENTON, IOWA
From 09-AUG-09 18:40:00 to 09-AUG-09 18:40:00 (CST-6)
Location: KEYSTONE
Magnitude: 78.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wind gusts estimated to be 90 mph were observed in Keystone, IA around 740 pm August 9.  This report was relayed by the emergency manager.

Hail in BUCHANAN, IOWA
From 09-AUG-09 11:02:00 to 09-AUG-09 11:02:00 (CST-6)
Location: THREE ELMS CO PARK
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Golf ball-sized hail fell just south of Independence, IA around 1202 pm August 9.

Thunderstorm Wind in BUCHANAN, IOWA
From 09-AUG-09 11:02:00 to 09-AUG-09 11:02:00 (CST-6)
Location: THREE ELMS CO PARK
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts estimated to be 70 mph were observed just south of Independence, IA around 1202 pm August 9.

Hail in DUBUQUE, IOWA
From 09-AUG-09 13:55:00 to 09-AUG-09 13:55:00 (CST-6)
Location: PEOSTA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in LINN, IOWA
From 09-AUG-09 19:16:00 to 09-AUG-09 19:16:00 (CST-6)
Location: CEDAR RAPIDS ARPT
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A 67 mph wind gust was measured by the ASOS at the Cedar Rapids Airport at 816 pm August 9.

Thunderstorm Wind in LINN, IOWA
From 09-AUG-09 19:20:00 to 09-AUG-09 19:20:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 60 mph wind gust was measured about 1 mile south southeast of Cedar Rapids, IA around 820 pm August 9.

Thunderstorm Wind in LINN, IOWA
From 09-AUG-09 19:24:00 to 09-AUG-09 19:24:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 70 mph were observed about 1 mile southeast of Cedar Rapids, IA around 824 pm August 9.

Thunderstorm Wind in LINN, IOWA
From 09-AUG-09 18:58:00 to 09-AUG-09 18:58:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph were observed about 1 mile south southeast of Cedar Rapids, IA around 758 pm August 9.

Thunderstorm Wind in JOHNSON, IOWA
From 09-AUG-09 19:05:00 to 09-AUG-09 19:05:00 (CST-6)
Location: KENT COUNTY PARK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts estimated to be 50 to 60 mph were observed in Oxford, IA around 805 pm August 9.

Thunderstorm Wind in LINN, IOWA
From 09-AUG-09 19:09:00 to 09-AUG-09 19:09:00 (CST-6)
Location: CEDAR RAPIDS ARPT
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A 63 mph wind gust was measured by the ASOS at the Cedar Rapids Airport at 809 pm August 9.

Thunderstorm Wind in BUCHANAN, IOWA
From 09-AUG-09 11:00:00 to 09-AUG-09 11:00:00 (CST-6)
Location: ROWLEY
Magnitude: 65.00 EG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Wind gusts estimated to be 75 mph blew down some two foot diameter trees and several 8 to 12 inch diameter tree limbs, ripped about 10 roofs off of some farm buildings, and blew down power lines in the vicinity of Rowley, IA around 1200 pm August 9.  A power outage was also observed.

Hail in DUBUQUE, IOWA
From 09-AUG-09 11:49:00 to 09-AUG-09 11:49:00 (CST-6)
Location: DYERSVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in DUBUQUE, IOWA
From 09-AUG-09 11:50:00 to 09-AUG-09 11:50:00 (CST-6)
Location: DYERSVILLE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts estimated to be 65 mph were observed in Dyersville, IA around 1250 pm August 9.

Thunderstorm Wind in DUBUQUE, IOWA
From 09-AUG-09 12:00:00 to 09-AUG-09 12:00:00 (CST-6)
Location: EPWORTH
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 70 mph overturned a mobile home and uprooted several large trees in Epworth, IA around 100 pm August 9.

Thunderstorm Wind in DELAWARE, IOWA
From 09-AUG-09 13:15:00 to 09-AUG-09 13:15:00 (CST-6)
Location: RYAN
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A 60 mph wind gust was measured in Ryan, IA around 215 pm August 9.

Thunderstorm Wind in DUBUQUE, IOWA
From 09-AUG-09 13:55:00 to 09-AUG-09 13:55:00 (CST-6)
Location: PEOSTA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph flattened some corn about 1 mile southwest of Peosta, IA around 255 pm August 9.

Thunderstorm Wind in IOWA, IOWA
From 09-AUG-09 18:31:00 to 09-AUG-09 18:31:00 (CST-6)
Location: VICTOR
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts estimated to be 70 mph blew down trees limbs and power lines in the vicinity of Victor, IA around 731 pm August 9.

Thunderstorm Wind in BENTON, IOWA
From 09-AUG-09 18:34:00 to 09-AUG-09 18:34:00 (CST-6)
Location: VAN HORNE
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A 70 mph wind gust was measured in Van Horne, IA around 734 pm August 9.

Thunderstorm Wind in BENTON, IOWA
From 09-AUG-09 18:35:00 to 09-AUG-09 18:35:00 (CST-6)
Location: VAN HORNE
Magnitude: 61.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 70 mph blew a 2 to 2.5 foot diameter tree down onto a house at the intersection of Highway 30 and 20th Avenue about 3 miles south southwest of Van Horne, IA around 735 pm August 9.

Thunderstorm Wind in BENTON, IOWA
From 09-AUG-09 18:16:00 to 09-AUG-09 18:16:00 (CST-6)
Location: BELLE PLAINE
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph blew a trampoline away in Belle Plaine, IA around 716 pm August 9.

Thunderstorm Wind in IOWA, IOWA
From 09-AUG-09 18:17:00 to 09-AUG-09 18:17:00 (CST-6)
Location: VICTOR
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts estimated to be 70 mph were observed in Victor, IA around 717 pm August 9.  This report was relayed by KCRG in Cedar Rapids.

Thunderstorm Wind in BENTON, IOWA
From 09-AUG-09 18:23:00 to 09-AUG-09 18:23:00 (CST-6)
Location: KEYSTONE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts estimated to be 70 mph blew down some trees and tree limbs in Keystone, IA around 723 pm August 9.

Hail in DUBUQUE, IOWA
From 09-AUG-09 12:01:00 to 09-AUG-09 12:01:00 (CST-6)
Location: EPWORTH
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Golf ball-sized hail fell in Epworth, IA around 101 pm August 9.

Thunderstorm Wind in DUBUQUE, IOWA
From 09-AUG-09 12:15:00 to 09-AUG-09 12:15:00 (CST-6)
Location: ASBURY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 50 to 60 mph were observed about 2 miles west of Dubuque, IA around 115 pm August 9.

Thunderstorm Wind in DUBUQUE, IOWA
From 09-AUG-09 12:18:00 to 09-AUG-09 12:18:00 (CST-6)
Location: (DBQ)DUBUQUE MUNI AR
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A 67 mph wind gusts was measured by the ASOS at the Dubuque Regional Airport around 118 pm August 9.

Hail in BENTON, IOWA
From 09-AUG-09 12:59:00 to 09-AUG-09 12:59:00 (CST-6)
Location: BELLE PLAINE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BUCHANAN, IOWA
From 09-AUG-09 11:02:00 to 09-AUG-09 11:02:00 (CST-6)
Location: INDEPENDENCE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Ping pong ball-sized hail fell in Independence, IA around 1202 pm August 9.

Thunderstorm Wind in BUCHANAN, IOWA
From 09-AUG-09 11:02:00 to 09-AUG-09 11:02:00 (CST-6)
Location: INDEPENDENCE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Wind gusts estimated to be 70 mph were observed in and south of Independence, IA around 1202 pm August 9.

Thunderstorm Wind in DELAWARE, IOWA
From 09-AUG-09 11:35:00 to 09-AUG-09 11:35:00 (CST-6)
Location: DELHI
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wind gusts estimated to be 70 mph were observed in Delhi, IA near Lake Delhi around 1235 pm August 9. This report was relayed by Delaware County.

Hail in DELAWARE, IOWA
From 09-AUG-09 11:36:00 to 09-AUG-09 11:36:00 (CST-6)
Location: MANCHESTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Quarter-sized hail fell about 3 miles south of Manchester, IA around 1236 pm August 9.

Thunderstorm Wind in BUCHANAN, IOWA
From 09-AUG-09 10:55:00 to 09-AUG-09 10:55:00 (CST-6)
Location: ROWLEY
Magnitude: 65.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 75 mph snapped off some mature 2 foot diameter trees and blew down some power lines about 3 miles west of Rowley, IA around 1155 am August 9.

Thunderstorm Wind in DELAWARE, IOWA
From 09-AUG-09 11:36:00 to 09-AUG-09 11:36:00 (CST-6)
Location: MANCHESTER
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts estimated to be 65 mph were observed about 3 miles south of Manchester, IA around 1236 pm August 9.

Thunderstorm Wind in BUCHANAN, IOWA
From 09-AUG-09 11:00:00 to 09-AUG-09 11:00:00 (CST-6)
Location: ROWLEY
Magnitude: 65.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 75 mph damaged the roof of a barn, caused damage at an implement dealer, and blew down some large tree limbs about 2 miles west of Rowley, IA around 1200 pm August 9.

Hail in BUCHANAN, IOWA
From 09-AUG-09 11:05:00 to 09-AUG-09 11:05:00 (CST-6)
Location: ROWLEY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Golf ball-sized hail fell in Rowley, IA around 1205 pm August 9.

Hail in DELAWARE, IOWA
From 09-AUG-09 11:25:00 to 09-AUG-09 11:25:00 (CST-6)
Location: MASONVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Quarter-sized hail fell about 2 miles south of Masonville, IA around 1225 pm August 9.

Hail in DELAWARE, IOWA
From 09-AUG-09 11:30:00 to 09-AUG-09 11:30:00 (CST-6)
Location: MANCHESTER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter