Thunderstorms produced widespread severe weather in northwest Iowa during the evening of April 9th, beginning at the end of the afternoon. Most of the reports at the start of the event were large hail, but damaging winds and tornadoes then developed, with significant damage reported.

Hail in WOODBURY, IOWA
From 09-APR-11 17:40:00 to 09-APR-11 17:40:00 (CST-6)
Location: SLOAN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in WOODBURY, IOWA
From 09-APR-11 17:46:00 to 09-APR-11 17:46:00 (CST-6)
Location: SALIX
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WOODBURY, IOWA
From 09-APR-11 17:49:00 to 09-APR-11 17:49:00 (CST-6)
Location: SALIX
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in WOODBURY, IOWA
From 09-APR-11 18:00:00 to 09-APR-11 18:00:00 (CST-6)
Location: SMITHLAND
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in IDA, IOWA
From 09-APR-11 18:29:00 to 09-APR-11 18:29:00 (CST-6)
Location: BATTLE CREEK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in IDA, IOWA
From 09-APR-11 18:33:00 to 09-APR-11 18:33:00 (CST-6)
Location: BATTLE CREEK
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in IDA, IOWA
From 09-APR-11 19:02:00 to 09-APR-11 19:02:00 (CST-6)
Location: IDA GROVE MUNI ARPT
Magnitude: 53.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Thunderstorm winds damaged farm buildings.

Thunderstorm Wind in IDA, IOWA
From 09-APR-11 19:02:00 to 09-APR-11 19:02:00 (CST-6)
Location: IDA GROVE MUNI ARPT
Magnitude: 53.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Thunderstorm winds damaged the roof of an outbuilding.

Thunderstorm Wind in IDA, IOWA
From 09-APR-11 19:05:00 to 09-APR-11 19:05:00 (CST-6)
Location: IDA GROVE MUNI ARPT
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in WOODBURY, IOWA
From 09-APR-11 19:10:00 to 09-APR-11 19:10:00 (CST-6)
Location: CORRECTIONVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in IDA, IOWA
From 09-APR-11 19:19:00 to 09-APR-11 19:19:00 (CST-6)
Location: ARTHUR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in IDA, IOWA
From 09-APR-11 19:42:00 to 09-APR-11 19:47:00 (CST-6)
Location: GALVA
Tornado F-scale: EF1
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado severely damaged a farmstead; taking the roof off of a house and destroying numerous outbuildings. The tornado also damaged outbuildings at another farmstead, snapped at least 5 power poles, and damaged an outbuilding at an ethanol plant. The tornado also caused tree damage.

Hail in IDA, IOWA
From 09-APR-11 19:45:00 to 09-APR-11 19:45:00 (CST-6)
Location: GALVA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CHEROKEE, IOWA
From 09-APR-11 19:55:00 to 09-APR-11 19:55:00 (CST-6)
Location: FIELDING
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BUENA VISTA, IOWA
From 09-APR-11 20:15:00 to 09-APR-11 20:15:00 (CST-6)
Location: SULPHUR SPGS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WOODBURY, IOWA
From 09-APR-11 20:18:00 to 09-APR-11 20:18:00 (CST-6)
Location: MOVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in CHEROKEE, IOWA
From 09-APR-11 20:20:00 to 09-APR-11 20:20:00 (CST-6)
Location: QUIMBY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

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

Thunderstorm Wind in CHEROKEE, IOWA
From 09-APR-11 20:22:00 to 09-APR-11 20:22:00 (CST-6)
Location: QUIMBY
Magnitude: 61.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Thunderstorm winds damaged outbuildings and a shelterbelt on a farmstead.

Hail in PLYMOUTH, IOWA
From 09-APR-11 20:24:00 to 09-APR-11 20:24:00 (CST-6)
Location: AKRON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in BUENA VISTA, IOWA
From 09-APR-11 20:24:00 to 09-APR-11 20:31:00 (CST-6)
Location: NEWELL
Tornado F-scale: EF2
Property damage: 1.00M
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado affected several farmsteads, damaging several homes, some beyond repair. The tornado destroyed or damaged numerous outbuildings, several silos, farm equipment, and livestock shelters. Numerous power lines, power poles, and trees were blown down. The tornado crossed into Buena Vista County from Sac County, then crossed out of Buena Vista County into Pocahontas County.

Tornado in BUENA VISTA, IOWA
From 09-APR-11 20:25:00 to 09-APR-11 20:27:00 (CST-6)
Location: NEWELL
Tornado F-scale: EF1
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado caused damage to outbuildings and other farm structures.

Tornado in BUENA VISTA, IOWA
From 09-APR-11 20:26:00 to 09-APR-11 20:27:00 (CST-6)
Location: NEWELL
Tornado F-scale: EF2
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado crossed into Buena Vista County from Sac County, and damaged farm structures and trees on a farmstead before dissipating.

High Wind in CLAY, IOWA
From 09-APR-11 20:40:00 to 09-APR-11 20:40:00 (CST-6)
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Strong winds not directly associated with the thunderstorms in the area blew off a metal part of a farm building 2 miles south of Everly.

Hail in CHEROKEE, IOWA
From 09-APR-11 20:40:00 to 09-APR-11 20:40:00 (CST-6)
Location: FIELDING
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in BUENA VISTA, IOWA
From 09-APR-11 20:50:00 to 09-APR-11 20:51:00 (CST-6)
Location: ALTA
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A brief tornado, one of two close together, caused no reported damage.

Tornado in BUENA VISTA, IOWA
From 09-APR-11 20:50:00 to 09-APR-11 20:51:00 (CST-6)
Location: ALTA
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A brief tornado, one of two close together, caused no reported damage.

Hail in PLYMOUTH, IOWA
From 09-APR-11 20:50:00 to 09-APR-11 20:50:00 (CST-6)
Location: MILLNERVILLE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

High Wind in DICKINSON, IOWA
From 09-APR-11 21:04:00 to 09-APR-11 21:04:00 (CST-6)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A measured wind gust of 64 mph was not directly associated with thunderstorms in the area.

Hail in BUENA VISTA, IOWA
From 09-APR-11 21:04:00 to 09-APR-11 21:04:00 (CST-6)
Location: TRUESDALE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in PLYMOUTH, IOWA
From 09-APR-11 21:07:00 to 09-APR-11 21:07:00 (CST-6)
Location: MERRILL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in PLYMOUTH, IOWA
From 09-APR-11 21:08:00 to 09-APR-11 21:08:00 (CST-6)
Location: MERRILL
Magnitude: 2.75 
Crop damage: 0.00K
Reported by: Broadcast Media

Baseball size hail caused an unknown amount of damage to vehicles and roofs.

Hail in PLYMOUTH, IOWA
From 09-APR-11 21:13:00 to 09-APR-11 21:13:00 (CST-6)
Location: LE MARS
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Broadcast Media

Large hail caused an unknown amount of damage to vehicles.

Hail in CHEROKEE, IOWA
From 09-APR-11 21:15:00 to 09-APR-11 21:15:00 (CST-6)
Location: CHEROKEE
Magnitude: 4.00 
Crop damage: 0.00K
Reported by: COOP Observer

Large hail was estimated at 4 inches in diameter with one stone measured at 3.5 inches. The hail caused an unknown amount of damage to vehicles.

Hail in CHEROKEE, IOWA
From 09-APR-11 21:15:00 to 09-APR-11 21:15:00 (CST-6)
Location: CHEROKEE
Magnitude: 2.75 
Crop damage: 0.00K
Reported by: Broadcast Media

Large hail caused an unknown amount of vehicle, siding, and roof damage.

Hail in PLYMOUTH, IOWA
From 09-APR-11 21:16:00 to 09-APR-11 21:16:00 (CST-6)
Location: LE MARS
Magnitude: 2.00 
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Large hail damaged siding and shutters on a house.

Thunderstorm Wind in BUENA VISTA, IOWA
From 09-APR-11 21:25:00 to 09-APR-11 21:25:00 (CST-6)
Location: NEWELL
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Thunderstorm winds caused roof damage to outbuildings on a farmstead.

Hail in BUENA VISTA, IOWA
From 09-APR-11 21:54:00 to 09-APR-11 21:54:00 (CST-6)
Location: SIOUX RAPIDS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BUENA VISTA, IOWA
From 09-APR-11 22:04:00 to 09-APR-11 22:04:00 (CST-6)
Location: LINN GROVE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in CLAY, IOWA
From 09-APR-11 22:31:00 to 09-APR-11 22:31:00 (CST-6)
Location: CORNELL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail partially covered the ground.

Hail in WOODBURY, IOWA
From 09-APR-11 23:25:00 to 09-APR-11 23:25:00 (CST-6)
Location: BRONSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WOODBURY, IOWA
From 09-APR-11 17:40:00 to 09-APR-11 17:40:00 (CST-6)
Location: SALIX
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tornado in IDA, IOWA
From 09-APR-11 19:20:00 to 09-APR-11 19:28:00 (CST-6)
Location: ARTHUR
Tornado F-scale: EF2
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado destroyed or heavily damaged two grain bins and two outbuildings on a farmstead. The tornado also caused mainly shingle damage to a house and garage on the same farmstead. Trees, power poles, and power lines were also damaged.

Hail in IDA, IOWA
From 09-APR-11 18:57:00 to 09-APR-11 18:57:00 (CST-6)
Location: IDA GROVE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tornado in CHEROKEE, IOWA
From 09-APR-11 20:20:00 to 09-APR-11 20:30:00 (CST-6)
Location: QUIMBY
Tornado F-scale: EF1
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado snapped and damaged power poles and lines, destroyed or damaged several outbuildings on two farmsteads, flipped over a camper into a garage, damaging the garage, flipped over a large anchored empty tank, damaged the roof of a house and broke windows on the house, heavily damaged several buildings in a livestock confinement area, blew a grain bin off its foundation into a semi truck cab, flipped another semi trailer into a grain bin, and caused tree damage, including several trees blown down or snapped off.

Tornado in BUENA VISTA, IOWA
From 09-APR-11 20:14:00 to 09-APR-11 20:15:00 (CST-6)
Location: SULPHUR SPGS
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A brief tornado caused no reported damage.