The supercell that moved across northern Iowa during the early morning hours left behind a strong outflow boundary.  This outflow boundary became established east to west across central Iowa.  At the same time a complex of thunderstorms that was generated by a short wave moving across Nebraska advanced toward western Iowa just before sunrise.  Though upper level jet divergence was in place, a strong mid level cap was in place through most of the night and the outflow boundary never produced any thunderstorm activity.  Temperatures in the mid levels fall significantly around sunrise.  The outflow boundary "lit up like a Christmas tree" around sunrise.  The thunderstorms became severe quickly and were large hail producers.  The storms moved east along the east to west line and also produced copious amounts of rainfall.  Initially the threat was the large hail.  Numerous reports of one to two inch diameter hail were received through central Iowa.  Some of the greatest damage occurred in the Des Moines metropolitan area as golf ball size hail pelted the city.  Damage was significant to both roofs as well as cars.  Several large car dealerships were hit on the west side of town with significant damage reported.  Estimates of damage were in the area of $250,000 to $500,000 each.  One off duty NWS employee on the west side has his back window broken out by hail with numerous hail pocks in the car. Initial estimates of damage on the west side of town indicate about 5000 insurance claims for cars at $900 to $1500 each, plus 3000 insurance claims for damages house roofs.  Golf ball size hail and 4 inches of rain fell near Grinnell in Poweshiek County.  Hail drifted to a depth of 2 to 3 feet deep in places.  Crops were totally destroyed as the hail fell for 25 minutes.  One farmer in the area reported 1000 acres of crops destroyed.  Wind was not a major factor with most of these storms.  One high wind report was received in Jasper County south of Prairie City.  Several trees were blown down there.  In addition, one tornado touched down briefly in the county.  The touchdown was in open country west of the town of Montezuma.  The tornado did little damage and lifted in a very short time.  Focus then shifted to the heavy rainfall.  The storms trained along the east west line for several hours.  A band of very heavy rain was reported from Greene County, east into Boone, Story, Dallas, and Polk Counties.  Rainfall of three to four inches was common in these areas.  Numerous roads were closed due to the high water. Water was standing in fields everywhere.  Some of the worst damage occurred in Story County as the densely populated area of Ames and Iowa State University was affected.  By the mid afternoon hours, the thunderstorms weakened and began to lift north slowly.  During the early afternoon hours as the thunderstorms moved through Sac County, lightning struck a tree in the town of Schaller.  The tree was split and landed on the house causing several thousand dollars damage.

Hail in POLK, IOWA
From 12-JUN-01 05:35:00 to 12-JUN-01 05:35:00 (CST)
Location: URBANDALE
Magnitude: 1.00 
Property damage: 10K
Crop damage: 1K
Reported by: TRAINED SPOTTER

Hail in POLK, IOWA
From 12-JUN-01 05:40:00 to 12-JUN-01 05:40:00 (CST)
Location: CLIVE
Magnitude: 1.75 
Property damage: 100K
Crop damage: 2K
Reported by: LAW ENFORCEMENT

Hail in POLK, IOWA
From 12-JUN-01 05:42:00 to 12-JUN-01 05:42:00 (CST)
Location: WINDSOR HGTS
Magnitude: 1.50 
Property damage: 25K
Reported by: NWS EMPLOYEE(OFF DUTY)

Hail in POLK, IOWA
From 12-JUN-01 05:44:00 to 12-JUN-01 05:44:00 (CST)
Location: URBANDALE
Magnitude: 1.75 
Property damage: 75K
Crop damage: 3K
Reported by: TRAINED SPOTTER

Hail in POLK, IOWA
From 12-JUN-01 05:45:00 to 12-JUN-01 05:45:00 (CST)
Location: URBANDALE
Magnitude: 1.50 
Property damage: 25K
Reported by: TRAINED SPOTTER

Hail in POLK, IOWA
From 12-JUN-01 05:53:00 to 12-JUN-01 05:53:00 (CST)
Location: CLIVE
Magnitude: 1.75 
Property damage: 75K
Reported by: LAW ENFORCEMENT

Hail in DALLAS, IOWA
From 12-JUN-01 05:58:00 to 12-JUN-01 05:58:00 (CST)
Location: WAUKEE
Magnitude: 0.75 
Crop damage: 4K
Reported by: NWS EMPLOYEE(OFF DUTY)

Hail in JASPER, IOWA
From 12-JUN-01 06:05:00 to 12-JUN-01 06:05:00 (CST)
Location: NEWTON
Magnitude: 0.88 
Property damage: 2K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in WARREN, IOWA
From 12-JUN-01 07:41:00 to 12-JUN-01 07:41:00 (CST)
Location: HARTFORD
Magnitude: 1.00 
Property damage: 5K
Crop damage: 5K
Reported by: NWS EMPLOYEE(OFF DUTY)

Thunderstorm Wind in JASPER, IOWA
From 12-JUN-01 07:47:00 to 12-JUN-01 07:47:00 (CST)
Location: PRAIRIE CITY
Magnitude: 52 E
Property damage: 2K
Reported by: TRAINED SPOTTER

Hail in MARION, IOWA
From 12-JUN-01 08:00:00 to 12-JUN-01 08:00:00 (CST)
Location: KNOXVILLE
Magnitude: 1.00 
Property damage: 5K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in MARION, IOWA
From 12-JUN-01 08:03:00 to 12-JUN-01 08:03:00 (CST)
Location: PELLA
Magnitude: 0.88 
Property damage: 1K
Crop damage: 4K
Reported by: UNKNOWN

Hail in CRAWFORD, IOWA
From 12-JUN-01 11:20:00 to 12-JUN-01 11:20:00 (CST)
Location: DOW CITY
Magnitude: 1.75 
Property damage: 10K
Crop damage: 10K
Reported by: TRAINED SPOTTER

Hail in POWESHIEK, IOWA
From 12-JUN-01 11:25:00 to 12-JUN-01 11:50:00 (CST)
Location: GRINNELL
Magnitude: 1.75 
Property damage: 10K
Crop damage: 50K
Reported by: LAW ENFORCEMENT

Hail in DALLAS, IOWA
From 12-JUN-01 11:31:00 to 12-JUN-01 11:31:00 (CST)
Location: WOODWARD
Magnitude: 1.00 
Property damage: 5K
Crop damage: 3K
Reported by: EMERGENCY MANAGER

Hail in DALLAS, IOWA
From 12-JUN-01 11:32:00 to 12-JUN-01 11:32:00 (CST)
Location: WOODWARD
Magnitude: 1.00 
Property damage: 5K
Crop damage: 3K
Reported by: FIRE DEPT/RESCUE SQUAD

Hail in BOONE, IOWA
From 12-JUN-01 11:27:00 to 12-JUN-01 11:27:00 (CST)
Location: MADRID
Magnitude: 1.00 
Property damage: 2K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Hail in DALLAS, IOWA
From 12-JUN-01 11:28:00 to 12-JUN-01 11:28:00 (CST)
Location: WOODWARD
Magnitude: 1.00 
Property damage: 5K
Crop damage: 3K
Reported by: LAW ENFORCEMENT

Hail in CARROLL, IOWA
From 12-JUN-01 12:12:00 to 12-JUN-01 12:12:00 (CST)
Location: DEDHAM
Magnitude: 1.00 
Property damage: 5K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Hail in JASPER, IOWA
From 12-JUN-01 13:00:00 to 12-JUN-01 13:00:00 (CST)
Location: BAXTER
Magnitude: 1.00 
Property damage: 5K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Flash Flood in STORY, IOWA
From 12-JUN-01 12:45:00 to 12-JUN-01 16:00:00 (CST)
Location: COUNTYWIDE
Property damage: 250K
Crop damage: 10K
Reported by: LAW ENFORCEMENT

Flash Flood in BOONE, IOWA
From 12-JUN-01 12:45:00 to 12-JUN-01 16:00:00 (CST)
Location: COUNTYWIDE
Property damage: 150K
Crop damage: 10K
Reported by: LAW ENFORCEMENT

Flash Flood in DALLAS, IOWA
From 12-JUN-01 12:30:00 to 12-JUN-01 16:00:00 (CST)
Location: NORTH PORTION
Property damage: 75K
Crop damage: 10K
Reported by: LAW ENFORCEMENT

Flash Flood in GREENE, IOWA
From 12-JUN-01 11:00:00 to 12-JUN-01 16:15:00 (CST)
Location: COUNTYWIDE
Property damage: 150K
Crop damage: 10K
Reported by: LAW ENFORCEMENT

Hail in POLK, IOWA
From 12-JUN-01 05:25:00 to 12-JUN-01 05:35:00 (CST)
Location: WEST DES MOINES
Magnitude: 2.00 
Property damage: 9.5M
Crop damage: 10K
Reported by: UNKNOWN

Hail in POLK, IOWA
From 12-JUN-01 05:30:00 to 12-JUN-01 05:30:00 (CST)
Location: CLIVE
Magnitude: 1.75 
Property damage: 250K
Crop damage: 10K
Reported by: NWS EMPLOYEE(OFF DUTY)

Flash Flood in POLK, IOWA
From 12-JUN-01 13:00:00 to 12-JUN-01 16:30:00 (CST)
Location: NORTH PORTION
Property damage: 150K
Crop damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MARSHALL, IOWA
From 12-JUN-01 04:20:00 to 12-JUN-01 04:20:00 (CST)
Location: GILMAN
Magnitude: 52 E
Property damage: 5K
Reported by: NEWSPAPER

Lightning in SAC, IOWA
From 12-JUN-01 12:30:00 to 12-JUN-01 12:30:00 (CST)
Location: SCHALLER
Property damage: 5K
Reported by: NEWSPAPER

Hail in POLK, IOWA
From 12-JUN-01 05:31:00 to 12-JUN-01 05:31:00 (CST)
Location: WEST DES MOINES
Magnitude: 1.75 
Property damage: 200K
Crop damage: 10K
Reported by: BROADCAST MEDIA

Hail in DALLAS, IOWA
From 12-JUN-01 05:31:00 to 12-JUN-01 05:31:00 (CST)
Location: WAUKEE
Magnitude: 1.75 
Property damage: 10K
Crop damage: 10K
Reported by: UNKNOWN

Hail in POLK, IOWA
From 12-JUN-01 05:35:00 to 12-JUN-01 05:35:00 (CST)
Location: WEST DES MOINES
Magnitude: 1.75 
Property damage: 50K
Crop damage: 5K
Reported by: BROADCAST MEDIA

Hail in POLK, IOWA
From 12-JUN-01 05:37:00 to 12-JUN-01 05:37:00 (CST)
Location: WEST DES MOINES
Magnitude: 2.75 
Property damage: 250K
Crop damage: 5K
Reported by: UNKNOWN

Hail in MARSHALL, IOWA
From 12-JUN-01 04:34:00 to 12-JUN-01 04:34:00 (CST)
Location: MARSHALLTOWN
Magnitude: 0.75 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in MARSHALL, IOWA
From 12-JUN-01 04:55:00 to 12-JUN-01 04:55:00 (CST)
Location: MARSHALLTOWN
Magnitude: 0.75 
Crop damage: 2K
Reported by: TRAINED SPOTTER

Hail in POLK, IOWA
From 12-JUN-01 08:39:00 to 12-JUN-01 08:39:00 (CST)
Location: ANKENY
Magnitude: 1.75 
Property damage: 75K
Crop damage: 5K
Reported by: UNKNOWN

Hail in MARION, IOWA
From 12-JUN-01 08:48:00 to 12-JUN-01 08:48:00 (CST)
Location: KNOXVILLE
Magnitude: 1.00 
Property damage: 2K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Hail in POLK, IOWA
From 12-JUN-01 08:53:00 to 12-JUN-01 08:53:00 (CST)
Location: POLK CITY
Magnitude: 1.75 
Property damage: 50K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Hail in MARSHALL, IOWA
From 12-JUN-01 08:55:00 to 12-JUN-01 08:55:00 (CST)
Location: LAUREL
Magnitude: 1.75 
Property damage: 25K
Crop damage: 10K
Reported by: BROADCAST MEDIA

Hail in JASPER, IOWA
From 12-JUN-01 08:59:00 to 12-JUN-01 08:59:00 (CST)
Location: BAXTER
Magnitude: 1.00 
Property damage: 2K
Crop damage: 5K
Reported by: EMERGENCY MANAGER

Hail in STORY, IOWA
From 12-JUN-01 09:00:00 to 12-JUN-01 09:00:00 (CST)
Location: MAXWELL
Magnitude: 0.75 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in STORY, IOWA
From 12-JUN-01 09:05:00 to 12-JUN-01 09:05:00 (CST)
Location: COLLINS
Magnitude: 1.00 
Property damage: 5K
Crop damage: 5K
Reported by: BROADCAST MEDIA

Hail in POLK, IOWA
From 12-JUN-01 09:15:00 to 12-JUN-01 09:15:00 (CST)
Location: ALLEMAN
Magnitude: 0.75 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in JASPER, IOWA
From 12-JUN-01 09:20:00 to 12-JUN-01 09:20:00 (CST)
Location: GALESBURG
Magnitude: 1.25 
Property damage: 5K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in MARSHALL, IOWA
From 12-JUN-01 09:35:00 to 12-JUN-01 09:35:00 (CST)
Location: STATE CENTER
Magnitude: 0.75 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in JASPER, IOWA
From 12-JUN-01 09:40:00 to 12-JUN-01 09:40:00 (CST)
Location: SULLY
Magnitude: 1.75 
Property damage: 25K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in MARSHALL, IOWA
From 12-JUN-01 09:52:00 to 12-JUN-01 09:52:00 (CST)
Location: STATE CENTER
Magnitude: 1.75 
Property damage: 10K
Crop damage: 10K
Reported by: BROADCAST MEDIA

Hail in MARION, IOWA
From 12-JUN-01 08:05:00 to 12-JUN-01 08:05:00 (CST)
Location: RED ROCK
Magnitude: 1.00 
Property damage: 5K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Tornado in POWESHIEK, IOWA
From 12-JUN-01 10:25:00 to 12-JUN-01 10:25:00 (CST)
Location: MONTEZUMA
Tornado F-scale: F0
Crop damage: 1K
Reported by: LAW ENFORCEMENT

Brief touchdown in open country.

Hail in GREENE, IOWA
From 12-JUN-01 10:32:00 to 12-JUN-01 10:32:00 (CST)
Location: SCRANTON
Magnitude: 0.75 
Crop damage: 5K
Reported by: AMATEUR RADIO

Hail in GREENE, IOWA
From 12-JUN-01 11:00:00 to 12-JUN-01 11:00:00 (CST)
Location: JEFFERSON
Magnitude: 0.88 
Property damage: 2K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in GREENE, IOWA
From 12-JUN-01 11:15:00 to 12-JUN-01 11:15:00 (CST)
Location: COOPER
Magnitude: 1.00 
Property damage: 3K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in CRAWFORD, IOWA
From 12-JUN-01 11:15:00 to 12-JUN-01 11:15:00 (CST)
Location: CHARTER OAK
Magnitude: 1.00 
Property damage: 3K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in JASPER, IOWA
From 12-JUN-01 09:55:00 to 12-JUN-01 09:55:00 (CST)
Location: LYNNVILLE
Magnitude: 1.75 
Property damage: 25K
Crop damage: 10K
Reported by: EMERGENCY MANAGER

Hail in BOONE, IOWA
From 12-JUN-01 10:13:00 to 12-JUN-01 10:13:00 (CST)
Location: BERKLEY
Magnitude: 1.75 
Property damage: 10K
Crop damage: 10K
Reported by: BROADCAST MEDIA

Hail in POWESHIEK, IOWA
From 12-JUN-01 10:23:00 to 12-JUN-01 10:23:00 (CST)
Location: SEARSBORO
Magnitude: 1.50 
Property damage: 10K
Crop damage: 5K
Reported by: TRAINED SPOTTER