The cold front mentioned in the previous event washed out and stalled south of Iowa.  An east to west boundary set up along the Iowa Missouri border.  There was little in the way of temperature contrast across the boundary, however there was a very significant dew point discontinuity.  Dew point readings were in the mid 30s to low 40s north of the boundary, while they were in the mid 60s to the south of it.  During the evening hours, a low level get formed with winds of 50 to 65 kts blowing across the boundary.  A supercell formed over eastern Nebraska and moved east-northeast into Iowa.  There were a few other cells that formed during the evening, however most of the severe weather was associated with the one supercell.  Hail from three quarters of an inch to two inches in diameter was common with the storm as it moved through.  The supercell produced two tornadoes.  Both of them were only on the ground briefly and caused little damage.  The first was in Carroll County east of Dedham.  The second was in Boone County west of Madrid.  Later in the evening, a cluster of thunderstorms formed to the northwest of the supercell.  In Kossuth County, hail nearly an inch in diameter nearly covered the ground along a two to three mile path near Fenton.

Hail in BOONE, IOWA
From 17-APR-02 23:10:00 to 17-APR-02 23:10:00 (CST)
Location: FRASER
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Hail in CARROLL, IOWA
From 17-APR-02 21:13:00 to 17-APR-02 21:13:00 (CST)
Location: MANNING
Magnitude: 1.75 
Property damage: 25K
Reported by: AMATEUR RADIO

Hail in AUDUBON, IOWA
From 17-APR-02 21:00:00 to 17-APR-02 21:00:00 (CST)
Location: GRAY
Magnitude: 0.88 
Property damage: 1K
Reported by: UNKNOWN

Hail in AUDUBON, IOWA
From 17-APR-02 20:50:00 to 17-APR-02 20:50:00 (CST)
Location: GRAY
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in GREENE, IOWA
From 17-APR-02 22:01:00 to 17-APR-02 22:01:00 (CST)
Location: SCRANTON
Magnitude: 1.00 
Property damage: 3K
Reported by: AMATEUR RADIO

Hail in GREENE, IOWA
From 17-APR-02 22:35:00 to 17-APR-02 22:35:00 (CST)
Location: RIPPEY
Magnitude: 2.00 
Property damage: 25K
Reported by: BROADCAST MEDIA

Hail in BREMER, IOWA
From 18-APR-02 01:25:00 to 18-APR-02 01:25:00 (CST)
Location: WAVERLY
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Hail in PALO ALTO, IOWA
From 17-APR-02 23:27:00 to 17-APR-02 23:27:00 (CST)
Location: EMMETSBURG
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Tornado in BOONE, IOWA
From 17-APR-02 22:45:00 to 17-APR-02 22:45:00 (CST)
Location: MADRID
Tornado F-scale: F0
Property damage: 1K
Reported by: AMATEUR RADIO

Brief touchdown in open country.  Little significant damage.

Tornado in CARROLL, IOWA
From 17-APR-02 21:40:00 to 17-APR-02 21:40:00 (CST)
Location: DEDHAM
Tornado F-scale: F0
Property damage: 1K
Reported by: TRAINED SPOTTER

Brief touchdown with only minor damage.

Hail in CARROLL, IOWA
From 17-APR-02 21:52:00 to 17-APR-02 21:52:00 (CST)
Location: COON RAPIDS
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in KOSSUTH, IOWA
From 17-APR-02 23:55:00 to 17-APR-02 23:59:00 (CST)
Location: FENTON
Magnitude: 0.88 
Property damage: 10K
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in KOSSUTH, IOWA
From 17-APR-02 23:55:00 to 17-APR-02 23:55:00 (CST)
Location: FENTON
Magnitude: 50 E
Reported by: EMERGENCY MANAGER

Hail in CRAWFORD, IOWA
From 17-APR-02 21:20:00 to 17-APR-02 21:20:00 (CST)
Location: MANILLA
Magnitude: 1.75 
Property damage: 20K
Reported by: TRAINED SPOTTER

Hail in CARROLL, IOWA
From 17-APR-02 21:28:00 to 17-APR-02 21:28:00 (CST)
Location: CARROLL
Magnitude: 1.75 
Property damage: 15K
Reported by: TRAINED SPOTTER

Hail in POCAHONTAS, IOWA
From 17-APR-02 22:58:00 to 17-APR-02 22:58:00 (CST)
Location: HAVELOCK
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Hail in CARROLL, IOWA
From 17-APR-02 21:25:00 to 17-APR-02 21:25:00 (CST)
Location: TEMPLETON
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in GREENE, IOWA
From 17-APR-02 22:06:00 to 17-APR-02 22:06:00 (CST)
Location: SCRANTON
Magnitude: 0.88 
Property damage: 3K
Reported by: TRAINED SPOTTER

Hail in HARDIN, IOWA
From 18-APR-02 00:40:00 to 18-APR-02 00:40:00 (CST)
Location: IOWA FALLS
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in FRANKLIN, IOWA
From 18-APR-02 00:55:00 to 18-APR-02 00:55:00 (CST)
Location: ACKLEY
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in GREENE, IOWA
From 17-APR-02 22:32:00 to 17-APR-02 22:32:00 (CST)
Location: GRAND JCT
Magnitude: 1.00 
Property damage: 5K
Reported by: AMATEUR RADIO

Hail in HAMILTON, IOWA
From 17-APR-02 23:40:00 to 17-APR-02 23:40:00 (CST)
Location: STANHOPE
Magnitude: 0.88 
Property damage: 3K
Reported by: LAW ENFORCEMENT

Hail in CARROLL, IOWA
From 17-APR-02 21:07:00 to 17-APR-02 21:07:00 (CST)
Location: DEDHAM
Magnitude: 2.00 
Property damage: 15K
Reported by: BROADCAST MEDIA

Hail in HAMILTON, IOWA
From 18-APR-02 00:06:00 to 18-APR-02 00:06:00 (CST)
Location: JEWELL
Magnitude: 1.00 
Property damage: 3K
Reported by: TRAINED SPOTTER

Hail in CARROLL, IOWA
From 17-APR-02 21:08:00 to 17-APR-02 21:08:00 (CST)
Location: MANNING
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in STORY, IOWA
From 17-APR-02 23:45:00 to 17-APR-02 23:45:00 (CST)
Location: STORY CITY
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in HAMILTON, IOWA
From 17-APR-02 23:27:00 to 17-APR-02 23:27:00 (CST)
Location: ELLSWORTH
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Hail in POCAHONTAS, IOWA
From 17-APR-02 23:00:00 to 17-APR-02 23:00:00 (CST)
Location: HAVELOCK
Magnitude: 1.00 
Property damage: 7K
Reported by: TRAINED SPOTTER

Hail in CRAWFORD, IOWA
From 17-APR-02 21:02:00 to 17-APR-02 21:02:00 (CST)
Location: ASPINWALL
Magnitude: 1.75 
Property damage: 25K
Reported by: TRAINED SPOTTER

Hail in CARROLL, IOWA
From 17-APR-02 21:05:00 to 17-APR-02 21:05:00 (CST)
Location: DEDHAM
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in HARDIN, IOWA
From 18-APR-02 00:21:00 to 18-APR-02 00:21:00 (CST)
Location: BUCKEYE
Magnitude: 1.50 
Property damage: 15K
Reported by: TRAINED SPOTTER

Hail in POCAHONTAS, IOWA
From 17-APR-02 22:57:00 to 17-APR-02 22:57:00 (CST)
Location: HAVELOCK
Magnitude: 0.88 
Property damage: 3K
Reported by: AMATEUR RADIO