The seasons first severe weather occurred around mid day on the 2nd.  Strong and deep southerly flow was in place across the central U.S.  Low pressure at the surface moved from southwest Kansas on the evening of the 1st, to eastern North Dakota by early afternoon of the 2nd.  A cold front extending south from the low moved into Iowa on the morning of the 2nd.  A low level jet of 40 to 50 kts was in place during the morning of the 2nd.  The upper level jet was around 100 kts at the time.  The overall sounding was nearly unidirectional.  There was limited CAPE available, around 500 J/kg of elevated CAPE, but sufficient dynamics were in place.  The 0-1 km shear was between 30 and 40 kts.  Thunderstorms developed along the cold front and moved rapidly northeast at 70 to 80 MPH across southern Iowa.  The storms produced sub-severe hail and winds of 60 to 70 MPH as they passed.  High winds blew a grain bin across a street, downed large tree branches, and tore siding off of a house in Decatur County.  Street signs were damaged in Lacona in Warren County, while part of a roof was torn off in Marion County at Columbia.  The storms weakened during the early afternoon hours, but still produced winds as the moved into central and northeast Iowa.  A 59 MPH wind gust was recorded at the Waterloo Airport.  Overall damage was limited, in part due to the fact that the trees had not leafed out yet.

Thunderstorm Wind in MARION, IOWA
From 02-APR-10 10:50:00 to 02-APR-10 10:50:00 (CST-6)
Location: COLUMBIA
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Part of a roof was blown off of a coop building in Columbia.

Hail in MARSHALL, IOWA
From 02-APR-10 10:50:00 to 02-APR-10 10:50:00 (CST-6)
Location: STATE CENTER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A few stones of nickel size; pea size hail nearly covered the ground.

Thunderstorm Wind in WARREN, IOWA
From 02-APR-10 10:37:00 to 02-APR-10 10:37:00 (CST-6)
Location: LACONA
Magnitude: 57.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

North side of town reported small trees and a few street signs down.  One outbuilding was damaged.

Thunderstorm Wind in MARION, IOWA
From 02-APR-10 10:50:00 to 02-APR-10 10:50:00 (CST-6)
Location: COLUMBIA
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

Grain bins at the coop were damaged by high winds.

Thunderstorm Wind in WARREN, IOWA
From 02-APR-10 10:20:00 to 02-APR-10 10:20:00 (CST-6)
Location: INDIANOLA
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain and small hail was also reported.

Thunderstorm Wind in TAYLOR, IOWA
From 02-APR-10 10:01:00 to 02-APR-10 10:01:00 (CST-6)
Location: BEDFORD
Magnitude: 61.00 MG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in DECATUR, IOWA
From 02-APR-10 10:12:00 to 02-APR-10 10:12:00 (CST-6)
Location: LEON
Magnitude: 59.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in WARREN, IOWA
From 02-APR-10 10:37:00 to 02-APR-10 10:37:00 (CST-6)
Location: LACONA
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wind speed estimated by Fire Department.

Hail in WARREN, IOWA
From 02-APR-10 10:28:00 to 02-APR-10 10:28:00 (CST-6)
Location: INDIANOLA ARPT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MARSHALL, IOWA
From 02-APR-10 10:55:00 to 02-APR-10 10:55:00 (CST-6)
Location: STATE CENTER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in DECATUR, IOWA
From 02-APR-10 10:14:00 to 02-APR-10 10:14:00 (CST-6)
Location: VAN WERT
Magnitude: 65.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A grain bin was blown across the road and large tree branches were downed.  Siding was ripped off of a house.

Thunderstorm Wind in MAHASKA, IOWA
From 02-APR-10 11:05:00 to 02-APR-10 11:05:00 (CST-6)
Location: EVANS
Magnitude: 57.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Newspaper

Barn roof blown off and outbuilding damage.

Thunderstorm Wind in MARION, IOWA
From 02-APR-10 10:53:00 to 02-APR-10 10:53:00 (CST-6)
Location: KNOXVILLE
Magnitude: 55.00 MG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in BLACK HAWK, IOWA
From 02-APR-10 11:50:00 to 02-APR-10 11:50:00 (CST-6)
Location: (ALO)WATERLOO MUNI A
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in HAMILTON, IOWA
From 02-APR-10 11:50:00 to 02-APR-10 11:50:00 (CST-6)
Location: WILLIAMS
Magnitude: 66.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in CASS, IOWA
From 02-APR-10 09:54:00 to 02-APR-10 09:54:00 (CST-6)
Location: ATLANTIC ARPT
Magnitude: 55.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in ADAIR, IOWA
From 02-APR-10 10:04:00 to 02-APR-10 10:04:00 (CST-6)
Location: FONTANELLE
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet