A strong push of moist and unstable air rode over the top of the cool dome of air at the surface.  The cold front that moved through the state the day before extended from central Illinois, through northern Missouri, into central Kansas.  The front had become stationary.  A south-southwest flow in the mid levels continued to feed over the top of the cool air that was in place over Iowa.  CAPE values just south of the front were around 2000 J/kg, with lifted indices around -8.  Though the freezing level remained quite high, in the 13,000 to 14,000 foot level, CAPE in the -10 to -30 C layer of the atmosphere was in the 500 to 700 J/kg range.  Shear was strong with 40 to 50 kts available.  Vigorous thunderstorm development took place across the south half of Iowa.  Severe storms developed in central and parts of south central Iowa.  Numerous reports of hail were received across the Des Moines metro area, with hail as large as golf ball size.  Large amounts of hail were reported with some of the storms completely covering the ground in spots up to an inch deep.  One storm produced high winds as it moved across the Des Moines Airport.  A 60 MPH wind gust was recorded.

Hail in POLK, IOWA
From 09-JUN-11 08:19:00 to 09-JUN-11 08:19:00 (CST-6)
Location: CLIVE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

From Clive Public Works.

Hail in POLK, IOWA
From 09-JUN-11 08:20:00 to 09-JUN-11 08:20:00 (CST-6)
Location: CLOVER HILLS
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in POLK, IOWA
From 09-JUN-11 08:24:00 to 09-JUN-11 08:26:00 (CST-6)
Location: LOVINGTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel hail ongoing at 0826 CDT.

Hail in POLK, IOWA
From 09-JUN-11 08:23:00 to 09-JUN-11 08:23:00 (CST-6)
Location: CLOVER HILLS
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At the WOI television studio.

Thunderstorm Wind in POLK, IOWA
From 09-JUN-11 05:29:00 to 09-JUN-11 05:29:00 (CST-6)
Location: DES MOINES
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hail in POLK, IOWA
From 09-JUN-11 08:32:00 to 09-JUN-11 08:32:00 (CST-6)
Location: SAYDELL
Magnitude: 1.00 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in POLK, IOWA
From 09-JUN-11 06:32:00 to 09-JUN-11 06:32:00 (CST-6)
Location: WINDSOR HGTS
Magnitude: 1.25 
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At the intersection of Hickman road and Beaver Ave in Beaverdale.

Hail in POLK, IOWA
From 09-JUN-11 06:37:00 to 09-JUN-11 06:37:00 (CST-6)
Location: DES MOINES
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Downtown Des Moines at east 1st and Court Ave.

Hail in POLK, IOWA
From 09-JUN-11 06:29:00 to 09-JUN-11 06:49:00 (CST-6)
Location: WINDSOR HGTS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Mostly 1/4 to 1/2 inch diameter hail with a few penny size.  Hail accumulated to a depth of 3/4 inch on the ground.

Hail in DALLAS, IOWA
From 09-JUN-11 06:42:00 to 09-JUN-11 06:42:00 (CST-6)
Location: HADDEN HILL
Magnitude: 1.00 
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Hail in POLK, IOWA
From 09-JUN-11 06:44:00 to 09-JUN-11 06:44:00 (CST-6)
Location: LOVINGTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 30th and Douglas in Des Moines.

Hail in DALLAS, IOWA
From 09-JUN-11 08:16:00 to 09-JUN-11 08:16:00 (CST-6)
Location: HADDEN HILL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 5.00K
Reported by: Broadcast Media

Corner of Jordan Creek Parkway and University Ave.

Hail in POLK, IOWA
From 09-JUN-11 08:30:00 to 09-JUN-11 08:30:00 (CST-6)
Location: LOVINGTON
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 30th and Aurora in Des Moines.

Hail in POLK, IOWA
From 09-JUN-11 08:32:00 to 09-JUN-11 08:32:00 (CST-6)
Location: URBANDALE
Magnitude: 1.75 
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Mainly nickel and quarter hail with a few the size of golf balls at the Urbandale Golf and Country Club.

Hail in POLK, IOWA
From 09-JUN-11 08:35:00 to 09-JUN-11 08:35:00 (CST-6)
Location: DES MOINES
Magnitude: 1.00 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At the intersection of 12th Street and Shawnee in the Highland Park area.

Hail in POLK, IOWA
From 09-JUN-11 06:24:00 to 09-JUN-11 06:24:00 (CST-6)
Location: ASHAWA
Magnitude: 1.00 
Property damage: 10.00K
Crop damage: 5.00K
Reported by: Trained Spotter

Hail in CLARKE, IOWA
From 09-JUN-11 05:25:00 to 09-JUN-11 05:25:00 (CST-6)
Location: WOODBURN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Hail in POLK, IOWA
From 09-JUN-11 08:36:00 to 09-JUN-11 08:36:00 (CST-6)
Location: SAYDELL
Magnitude: 1.00 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At the intersection of 2nd Street and Interstate 80.

Hail in POLK, IOWA
From 09-JUN-11 06:30:00 to 09-JUN-11 06:30:00 (CST-6)
Location: CLOVER HILLS
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Observed at the WOI TV Studios in West Des Moines.

Hail in POLK, IOWA
From 09-JUN-11 06:25:00 to 09-JUN-11 06:25:00 (CST-6)
Location: CLOVER HILLS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in POLK, IOWA
From 09-JUN-11 06:23:00 to 09-JUN-11 06:23:00 (CST-6)
Location: ASHAWA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in POLK, IOWA
From 09-JUN-11 06:35:00 to 09-JUN-11 06:35:00 (CST-6)
Location: LOVINGTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DALLAS, IOWA
From 09-JUN-11 07:57:00 to 09-JUN-11 07:57:00 (CST-6)
Location: DE SOTO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: Trained Spotter