Thunderstorms produced large hail and damaging winds in several counties of northwest Iowa on the late evening of August 2nd to a little after midnight on August 3rd. Heavy rain with the storms produced flash flooding in Ida County.

Thunderstorm Wind in PLYMOUTH, IOWA
From 02-AUG-09 22:30:00 to 02-AUG-09 22:30:00 (CST-6)
Location: CRAIG
Magnitude: 56.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage and blew down power lines. The amount of damage was not known.

Thunderstorm Wind in PLYMOUTH, IOWA
From 02-AUG-09 22:35:00 to 02-AUG-09 22:35:00 (CST-6)
Location: LE MARS
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Hail in O'BRIEN, IOWA
From 02-AUG-09 22:40:00 to 02-AUG-09 22:40:00 (CST-6)
Location: SANBORN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CHEROKEE, IOWA
From 02-AUG-09 22:45:00 to 02-AUG-09 22:45:00 (CST-6)
Location: CLEGHORN
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds caused tree damage, including several large branches blown down.

Thunderstorm Wind in O'BRIEN, IOWA
From 02-AUG-09 22:45:00 to 02-AUG-09 22:45:00 (CST-6)
Location: ARCHER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage, including some large branches and limbs blown down.

Thunderstorm Wind in CLAY, IOWA
From 02-AUG-09 23:00:00 to 02-AUG-09 23:00:00 (CST-6)
Location: PETERSON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm winds caused tree damage, including large limbs blown down.

Thunderstorm Wind in WOODBURY, IOWA
From 02-AUG-09 23:03:00 to 02-AUG-09 23:03:00 (CST-6)
Location: SIOUX CITY
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BUENA VISTA, IOWA
From 02-AUG-09 23:20:00 to 02-AUG-09 23:20:00 (CST-6)
Location: STORM LAKE
Magnitude: 52.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm winds caused tree damage, including large branches and limbs blown down. At least two vehicles, a pickup truck and a restored automobile, suffered damage from tree debris.

Hail in PLYMOUTH, IOWA
From 03-AUG-09 00:06:00 to 03-AUG-09 00:06:00 (CST-6)
Location: KINGSLEY
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail damaged vehicles. The amount of damage was not known.

Hail in WOODBURY, IOWA
From 03-AUG-09 00:19:00 to 03-AUG-09 00:19:00 (CST-6)
Location: PIERSON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in IDA, IOWA
From 03-AUG-09 00:50:00 to 03-AUG-09 00:50:00 (CST-6)
Location: GALVA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in IDA, IOWA
From 03-AUG-09 01:15:00 to 03-AUG-09 03:00:00 (CST-6)
Location: HOLSTEIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain caused flash flooding of streets and low areas in the town of Holstein.

Hail in WOODBURY, IOWA
From 03-AUG-09 01:36:00 to 03-AUG-09 01:36:00 (CST-6)
Location: ANTHON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WOODBURY, IOWA
From 03-AUG-09 01:45:00 to 03-AUG-09 01:45:00 (CST-6)
Location: OTO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in SIOUX, IOWA
From 02-AUG-09 22:13:00 to 02-AUG-09 22:13:00 (CST-6)
Location: ROCK VLY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm winds caused tree damage, including several trees blown down.

Thunderstorm Wind in SIOUX, IOWA
From 02-AUG-09 22:24:00 to 02-AUG-09 22:24:00 (CST-6)
Location: CHATSWORTH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage, including several branches blown down.

Thunderstorm Wind in O'BRIEN, IOWA
From 02-AUG-09 23:05:00 to 02-AUG-09 23:05:00 (CST-6)
Location: SUTHERLAND
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds caused tree damage, including numerous branches and limbs blown down.