A strong low level jet moving over a warm front from Northern Missouri into Central Illinois combined with an upper level disturbance to produce thunderstorms across Iowa and Northern Illinois.  As the storms became better organized, they were prolific producers of hail from 0.75 to 1 inch.  In Muscatine County Iowa, the storms organized into a small bow echo that moved through Rock Island, Henry, Bureau, and Putnam counties in Illinois.  Southern Henry County Illinois took the brunt of the bow echo with near continuous damage from Interstate 74 to Galva, Illinois with the worst damage in Galva.	A second round of thunderstorms developed around dawn from boundaries left over from the overnight storms.  Due to a drier atmosphere, the hail produced by this round of storms was much larger.

Hail in LINN, IOWA
From 07-MAY-04 01:50:00 to 07-MAY-04 01:53:00 (CST)
Location: CEDAR RAPIDS
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

At Kirkwood College

Hail in JOHNSON, IOWA
From 07-MAY-04 02:13:00 to 07-MAY-04 02:18:00 (CST)
Location: IOWA CITY
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Also reported 2 West and 1 East of Iowa City

Hail in JOHNSON, IOWA
From 07-MAY-04 09:08:00 to 07-MAY-04 09:10:00 (CST)
Location: SHUEYVILLE
Magnitude: 0.88 
Crop damage: 5K
Reported by: BROADCAST MEDIA

Reported by KCRG TV

Hail in LINN, IOWA
From 07-MAY-04 10:23:00 to 07-MAY-04 10:25:00 (CST)
Location: MARION
Magnitude: 1.75 
Property damage: 20K
Crop damage: 2K
Reported by: TRAINED SPOTTER

Also reported by Amateur radio.  Hail of 1.25 to 1.5 inches in diameter also occurred on the north side of the city of Marion.

Hail in SCOTT, IOWA
From 07-MAY-04 07:15:00 to 07-MAY-04 07:19:00 (CST)
Location: ELDRIDGE
Magnitude: 1.00 
Property damage: 5K
Crop damage: 10K
Reported by: NWS EMPLOYEE(OFF DUTY)

A thunderstorm producing hail of 0.75 to 1 inch struck Eldridge with some accumulation noted on the ground.

Hail in JOHNSON, IOWA
From 07-MAY-04 09:02:00 to 07-MAY-04 09:04:00 (CST)
Location: SWISHER
Magnitude: 0.88 
Crop damage: 5K
Reported by: BROADCAST MEDIA

Reported by KCRG TV

Thunderstorm Wind in SCOTT, IOWA
From 07-MAY-04 03:27:00 to 07-MAY-04 03:30:00 (CST)
Location: DAVENPORT
Magnitude: 57 EG
Property damage: 10K
Reported by: NWS EMPLOYEE(OFF DUTY)

10 inch diameter limbs down

Hail in JOHNSON, IOWA
From 07-MAY-04 05:44:00 to 07-MAY-04 05:54:00 (CST)
Location: IOWA CITY
Magnitude: 1.75 
Property damage: 70K
Crop damage: 10K
Reported by: TRAINED SPOTTER

Hail of 1.00 to 1.50 inches in diameter with some golfball sized hail occurred with thunderstorm number 3 in Iowa City, and 2 miles west, 1 mile south, and 1 mile east of Iowa City.  Hail covered the ground in the southeast part of the city with numerous cars receiving dents.

Hail in JOHNSON, IOWA
From 07-MAY-04 04:55:00 to 07-MAY-04 04:59:00 (CST)
Location: IOWA CITY
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Hail in CEDAR, IOWA
From 07-MAY-04 09:53:00 to 07-MAY-04 10:00:00 (CST)
Location: TIPTON
Magnitude: 1.00 
Property damage: 5K
Crop damage: 10K
Reported by: LAW ENFORCEMENT

Also reported by a storm chaser

Hail in LINN, IOWA
From 07-MAY-04 10:06:00 to 07-MAY-04 10:11:00 (CST)
Location: TODDVILLE
Magnitude: 0.75 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in SCOTT, IOWA
From 07-MAY-04 03:11:00 to 07-MAY-04 03:13:00 (CST)
Location: BUFFALO
Magnitude: 52 EG
Property damage: 2K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in SCOTT, IOWA
From 07-MAY-04 03:16:00 to 07-MAY-04 03:17:00 (CST)
Location: BLUE GRASS
Magnitude: 0.75 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in LINN, IOWA
From 07-MAY-04 10:10:00 to 07-MAY-04 10:15:00 (CST)
Location: ROBINS
Magnitude: 1.75 
Property damage: 20K
Crop damage: 2K
Reported by: TRAINED SPOTTER

Also reported by the public.

Hail in LINN, IOWA
From 07-MAY-04 01:46:00 to 07-MAY-04 01:50:00 (CST)
Location: CEDAR RAPIDS
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in BENTON, IOWA
From 07-MAY-04 01:32:00 to 07-MAY-04 01:36:00 (CST)
Location: SHELLSBURG
Magnitude: 1.00 
Property damage: 5K
Crop damage: 10K
Reported by: EMERGENCY MANAGER

Hail in SCOTT, IOWA
From 07-MAY-04 03:11:00 to 07-MAY-04 03:13:00 (CST)
Location: BUFFALO
Magnitude: 0.88 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in LINN, IOWA
From 07-MAY-04 10:09:00 to 07-MAY-04 10:11:00 (CST)
Location: HIAWATHA
Magnitude: 0.75 
Crop damage: 2K
Reported by: AMATEUR RADIO

Covered the ground.

Hail in LINN, IOWA
From 07-MAY-04 10:35:00 to 07-MAY-04 10:37:00 (CST)
Location: SPRINGVILLE
Magnitude: 1.75 
Property damage: 20K
Crop damage: 10K
Reported by: AMATEUR RADIO

Hail in JONES, IOWA
From 07-MAY-04 10:45:00 to 07-MAY-04 10:55:00 (CST)
Location: ANAMOSA
Magnitude: 1.00 
Property damage: 5K
Crop damage: 15K
Reported by: FIRE DEPT/RESCUE SQUAD

Also reported by KCRG TV and amateur radio.  A severe thunderstorm produced a continuous path of 1 inch hail from the junction of highways 1 and U.S. 151 to Anamosa.  At the U.S. 151 bridge over the Wapsipinicon River 1.9 miles SSE of Anamosa, 1 inch hail also occurred.

Thunderstorm Wind in MUSCATINE, IOWA
From 07-MAY-04 02:41:00 to 07-MAY-04 02:43:00 (CST)
Location: ATALISSA
Magnitude: 52 EG
Property damage: 20K
Crop damage: 15K
Reported by: TRAINED SPOTTER

2 semi trucks blown over with significant power lines down

Thunderstorm Wind in MUSCATINE, IOWA
From 07-MAY-04 02:56:00 to 07-MAY-04 02:58:00 (CST)
Location: SWEETLAND CENTER
Magnitude: 61 EG
Property damage: 50K
Crop damage: 25K
Reported by: LAW ENFORCEMENT

Grain bin blown over with trees into houses.

Thunderstorm Wind in MUSCATINE, IOWA
From 07-MAY-04 03:01:00 to 07-MAY-04 03:04:00 (CST)
Location: PLEASANT PRAIRIE
Magnitude: 55 EG
Property damage: 10K
Crop damage: 20K
Reported by: LAW ENFORCEMENT

Semi blown over on U.S. 61 at 97 mile marker.

Thunderstorm Wind in MUSCATINE, IOWA
From 07-MAY-04 02:55:00 to 07-MAY-04 02:57:00 (CST)
Location: MUSCATINE
Magnitude: 54 MG
Property damage: 2K
Crop damage: 5K
Reported by: OFFICIAL NWS OBS.

From co-op observer

Hail in MUSCATINE, IOWA
From 07-MAY-04 02:48:00 to 07-MAY-04 02:54:00 (CST)
Location: WILTON
Magnitude: 0.75 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in MUSCATINE, IOWA
From 07-MAY-04 02:57:00 to 07-MAY-04 03:00:00 (CST)
Location: MUSCATINE
Magnitude: 61 EG
Property damage: 25K
Crop damage: 10K
Reported by: TRAINED SPOTTER

8 power lines down with 2 semi trucks blown over.

Hail in JOHNSON, IOWA
From 07-MAY-04 09:24:00 to 07-MAY-04 09:29:00 (CST)
Location: SOLON
Magnitude: 0.88 
Crop damage: 5K
Reported by: GENERAL PUBLIC

Covered the ground

Hail in BENTON, IOWA
From 07-MAY-04 01:13:00 to 07-MAY-04 01:16:00 (CST)
Location: VINTON
Magnitude: 1.75 
Property damage: 10K
Crop damage: 15K
Reported by: EMERGENCY MANAGER

Also reported by KCRG TV

Hail in CEDAR, IOWA
From 07-MAY-04 09:41:00 to 07-MAY-04 09:44:00 (CST)
Location: CEDAR BLUFF
Magnitude: 1.00 
Property damage: 5K
Crop damage: 10K
Reported by: EMERGENCY MANAGER

Hail in BENTON, IOWA
From 07-MAY-04 09:50:00 to 07-MAY-04 09:52:00 (CST)
Location: SHELLSBURG
Magnitude: 1.00 
Property damage: 5K
Crop damage: 10K
Reported by: BROADCAST MEDIA

A second thunderstorm developed on outflow boundaries from the earlier storms and produced a second round of 1 inch hail in Shellsburg.