A line of thunderstorms pivoted northeast into parts of southeast Iowa during the mid-morning hours of June 1st. Much of the area was just breaking out of a blanket of dense fog where visibilities dropped to less than a quarter mile. Dew point temperatures were in the middle 60s to around 70 degrees.
The line of storms appeared to become more broken through the late morning hours, while the area from Iowa City to Waterloo appeared to stratify out into a large area of showers. Just before 12:00 pm CDT, rapid intensification of storm cells on the southeast end of the original line occurred as it moved into northern portions of Louisa County.
A tornado touched down just south of Grandview, IA and moved northeast through Fruitland, IA and on to the southwest parts of Muscatine, IA. The tornado then lifted and as the storm cell continued to move northeast across Muscatine County. The super-cell re-intensified as it entered the southeast part of Cedar County just before 1 pm producing a brief tornado near Wilton, IA. The storm then moved across northwest parts of Scott County and Clinton County producing damaging wind gusts and large hail. The super-cell continued northeast into Jackson County producing a tornado near Bellevue around 2:30 pm, which moved across the Mississippi River into Jo Daviess County before lifting. The storm produced yet another tornado just south of Scales Mound, IL around 3:15 pm before moving into southwest Wisconsin and dissipating.
During the early afternoon hours, additional storms strengthened on the south end of the original line of storms, which went on to produce wind damage and large hail as they moved through northwest Illinois through the late afternoon hours.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 01-JUN-07 12:45:00 to 01-JUN-07 12:45:00 (CST-6)
Location: BLACKHAWK STATE PARK
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in HENRY, ILLINOIS
From 01-JUN-07 13:55:00 to 01-JUN-07 13:55:00 (CST-6)
Location: ANNAWAN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Tree limbs about 4 to 5 inches in diameter were blown down.  Time estimated.

Thunderstorm Wind in MERCER, ILLINOIS
From 01-JUN-07 12:40:00 to 01-JUN-07 12:40:00 (CST-6)
Location: NORTH HENDERSON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A dozen 12 inch diameter trees were blown over.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 01-JUN-07 13:30:00 to 01-JUN-07 13:30:00 (CST-6)
Location: ERIE
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 1.00K
Reported by: Emergency Manager

Some grain bins were blown off of their foundations into each other and a pole building was destroyed.  In addition, some power poles and large tree limbs were blown down and a portion of a corn field was flattened.  Time estimated.

Hail in ROCK ISLAND, ILLINOIS
From 01-JUN-07 12:27:00 to 01-JUN-07 12:27:00 (CST-6)
Location: BLACKHAWK STATE PARK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail the size of nickels and quarters fell in downtown Rock Island.

Thunderstorm Wind in CARROLL, ILLINOIS
From 01-JUN-07 14:05:00 to 01-JUN-07 14:05:00 (CST-6)
Location: MT CARROLL
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down on Funk Rd northeast of Mount Carroll just off of Route 78.

Hail in ROCK ISLAND, ILLINOIS
From 01-JUN-07 12:26:00 to 01-JUN-07 12:26:00 (CST-6)
Location: BLACKHAWK STATE PARK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail the size of quarters fell in lower Rock Island.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 01-JUN-07 12:45:00 to 01-JUN-07 12:45:00 (CST-6)
Location: BLACKHAWK STATE PARK
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down on 11th Street.

Hail in ROCK ISLAND, ILLINOIS
From 01-JUN-07 12:30:00 to 01-JUN-07 12:35:00 (CST-6)
Location: TAYLOR RIDGE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail the size of a penny fell about 1 mile north of the Highland Spring Golf Course.

Thunderstorm Wind in CARROLL, ILLINOIS
From 01-JUN-07 14:40:00 to 01-JUN-07 14:40:00 (CST-6)
Location: MILLEDGEVILLE
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Power lines were blown down.

Hail in BUREAU, ILLINOIS
From 01-JUN-07 16:45:00 to 01-JUN-07 16:45:00 (CST-6)
Location: SPRING VLY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PUTNAM, ILLINOIS
From 01-JUN-07 16:40:00 to 01-JUN-07 16:40:00 (CST-6)
Location: MARK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail (quarter size) fell right before the heavy rain.