An upper level disturbance induced a surface low pressure on a boundary across Eastern Iowa that moved into Northwest Illinois and far Northeast Missouri.  Subsequent thunderstorms that developed were prolific hail producers due to extremely cold air aloft.  Additional outflow boundaries produced by the initial thunderstorms created new storms and brief funnel clouds that fortunately never touched down.  Pea sized hail (0.25 inch) continued continuously for 20 minutes in Princeton, Illinois and covered the ground.

Hail in MUSCATINE, IOWA
From 14-MAY-03 18:48:00 to 14-MAY-03 18:48:00 (CST)
Location: ATALISSA
Magnitude: 1.00 
Property damage: 100K
Reported by: LAW ENFORCEMENT

Hail in MUSCATINE, IOWA
From 14-MAY-03 19:00:00 to 14-MAY-03 19:00:00 (CST)
Location: ATALISSA
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in MUSCATINE, IOWA
From 14-MAY-03 19:03:00 to 14-MAY-03 19:03:00 (CST)
Location: WILTON
Magnitude: 0.75 
Reported by: AMATEUR RADIO

Hail in BENTON, IOWA
From 14-MAY-03 16:13:00 to 14-MAY-03 16:17:00 (CST)
Location: URBANA
Magnitude: 0.75 
Reported by: EMERGENCY MANAGER

Duration 3-4 minutes

Heavy Rain in BUCHANAN, IOWA
From 14-MAY-03 16:41:00 to 14-MAY-03 16:41:00 (CST)
Location: INDEPENDENCE
Magnitude: 2 
Property damage: 25K
Reported by: EMERGENCY MANAGER

Hail in KEOKUK, IOWA
From 14-MAY-03 15:20:00 to 14-MAY-03 15:20:00 (CST)
Location: WHAT CHEER
Magnitude: 0.88 
Reported by: LAW ENFORCEMENT

Hail in BENTON, IOWA
From 14-MAY-03 15:55:00 to 14-MAY-03 15:55:00 (CST)
Location: KEYSTONE
Magnitude: 0.88 
Reported by: EMERGENCY MANAGER

Flash Flood in BUCHANAN, IOWA
From 14-MAY-03 16:55:00 to 14-MAY-03 19:00:00 (CST)
Location: INDEPENDENCE
Magnitude: 3.5 
Property damage: 250K
Reported by: EMERGENCY MANAGER

Cars abandoned on street

Hail in LINN, IOWA
From 14-MAY-03 17:01:00 to 14-MAY-03 17:04:00 (CST)
Location: (CID)CEDAR RAPIDS AR
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Duration 3-4 minutes

Thunderstorm Wind in LEE, IOWA
From 14-MAY-03 17:05:00 to 14-MAY-03 17:05:00 (CST)
Location: FT MADISON
Magnitude: 52 EG
Property damage: 150K
Reported by: EMERGENCY MANAGER

Large tree down

Hail in JOHNSON, IOWA
From 14-MAY-03 17:45:00 to 14-MAY-03 17:45:00 (CST)
Location: IOWA CITY
Magnitude: 1.75 
Property damage: 100K
Reported by: BROADCAST MEDIA

Hail in CEDAR, IOWA
From 14-MAY-03 17:55:00 to 14-MAY-03 17:55:00 (CST)
Location: CEDAR BLUFF
Magnitude: 1.75 
Property damage: 250K
Reported by: BROADCAST MEDIA

Thunderstorm Wind in DES MOINES, IOWA
From 14-MAY-03 17:26:00 to 14-MAY-03 17:26:00 (CST)
Location: BURLINGTON
Magnitude: 52 EG
Property damage: 100K
Reported by: TRAINED SPOTTER

Hail in JOHNSON, IOWA
From 14-MAY-03 17:26:00 to 14-MAY-03 17:26:00 (CST)
Location: IOWA CITY
Magnitude: 1.00 
Property damage: 100K
Reported by: AMATEUR RADIO

Car windows broken on Interstate 380

Hail in SCOTT, IOWA
From 14-MAY-03 12:30:00 to 14-MAY-03 12:30:00 (CST)
Location: WALCOTT
Magnitude: 1.00 
Property damage: 50K
Reported by: LAW ENFORCEMENT

Hail in MUSCATINE, IOWA
From 14-MAY-03 12:45:00 to 14-MAY-03 12:45:00 (CST)
Location: MUSCATINE
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in DES MOINES, IOWA
From 14-MAY-03 17:12:00 to 14-MAY-03 17:12:00 (CST)
Location: WEST BURLINGTON
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Funnel Cloud in DES MOINES, IOWA
From 14-MAY-03 17:16:00 to 14-MAY-03 17:23:00 (CST)
Location: BURLINGTON
Reported by: LAW ENFORCEMENT

Hail in LINN, IOWA
From 14-MAY-03 17:18:00 to 14-MAY-03 17:18:00 (CST)
Location: HIAWATHA
Magnitude: 0.75 
Reported by: EMERGENCY MANAGER

Funnel Cloud in MUSCATINE, IOWA
From 14-MAY-03 19:15:00 to 14-MAY-03 19:15:00 (CST)
Location: SWEETLAND CENTER
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in VAN BUREN, IOWA
From 14-MAY-03 16:42:00 to 14-MAY-03 16:42:00 (CST)
Location: FARMINGTON
Magnitude: 52 EG
Property damage: 50K
Reported by: TRAINED SPOTTER

Hail in LINN, IOWA
From 14-MAY-03 16:55:00 to 14-MAY-03 17:00:00 (CST)
Location: CEDAR RAPIDS
Magnitude: 1.00 
Property damage: 250K
Reported by: TRAINED SPOTTER

Duration 5 minutes

Hail in KEOKUK, IOWA
From 14-MAY-03 15:03:00 to 14-MAY-03 15:03:00 (CST)
Location: DELTA
Magnitude: 0.75 
Reported by: EMERGENCY MANAGER