Thunderstorms that moved through western Iowa during the evening of the 29th into the early morning hours of the 30th continued into the day on the 30th.  The airmass where the storms were had become stabilized as the outflow boundary had outrun the convection.  Just east of the line however, instability still existed with the lifted index around -2 C, 1000 J/kg of CAPE, and at least 40 kts of shear available.  A cold front entered western Iowa during the morning, and progressed eastward as a strong upper level shortwave lifted out of the southwest U.S.  This rekindled the thunderstorm line from the previous night and the storms became severe by mid to late morning.  The only severe weather produced was in the form of dime to quarter size hail from south central into southeast Iowa.  Lightning struck a tree in Bremer County, taking it down.  As the thunderstorms moved east of the Ottuwma area, lightning strikes from the back side of the storm struck a house in Ottumwa, causing minor damage.

Hail in POWESHIEK, IOWA
From 30-APR-10 10:16:00 to 30-APR-10 10:16:00 (CST-6)
Location: SEARSBORO
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lightning in BREMER, IOWA
From 30-APR-10 11:15:00 to 30-APR-10 11:15:00 (CST-6)
Location: DENVER
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was stuck by lightning and fell down.

Hail in WAPELLO, IOWA
From 30-APR-10 11:25:00 to 30-APR-10 11:25:00 (CST-6)
Location: RUTLEDGE
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lightning in WAPELLO, IOWA
From 30-APR-10 11:30:00 to 30-APR-10 11:30:00 (CST-6)
Location: OTTUMWA
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

Hail in WAPELLO, IOWA
From 30-APR-10 11:17:00 to 30-APR-10 11:17:00 (CST-6)
Location: OTTUMWA
Magnitude: 1.00 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WAPELLO, IOWA
From 30-APR-10 11:10:00 to 30-APR-10 11:10:00 (CST-6)
Location: RUTLEDGE
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DECATUR, IOWA
From 30-APR-10 09:00:00 to 30-APR-10 09:00:00 (CST-6)
Location: DAVIS CITY
Magnitude: 1.00 
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WAPELLO, IOWA
From 30-APR-10 11:16:00 to 30-APR-10 11:16:00 (CST-6)
Location: OTTUMWA
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DECATUR, IOWA
From 30-APR-10 09:10:00 to 30-APR-10 09:10:00 (CST-6)
Location: WOODLAND
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MONROE, IOWA
From 30-APR-10 09:46:00 to 30-APR-10 09:46:00 (CST-6)
Location: WELLER
Magnitude: 0.88 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MARION, IOWA
From 30-APR-10 10:00:00 to 30-APR-10 10:00:00 (CST-6)
Location: PELLA MUNI ARPT
Magnitude: 0.88 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in APPANOOSE, IOWA
From 30-APR-10 10:45:00 to 30-APR-10 10:45:00 (CST-6)
Location: DEAN
Magnitude: 0.88 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in APPANOOSE, IOWA
From 30-APR-10 10:50:00 to 30-APR-10 10:50:00 (CST-6)
Location: MOULTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter