Storms developed ahead of a strong cold front as it moved through the region.  There were numerous reports of damaging winds as well as some isolated large hail and flash flooding.

Thunderstorm Wind in GREENE, ILLINOIS
From 27-JUN-10 16:57:00 to 27-JUN-10 16:57:00 (CST-6)
Location: GREENFIELD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds blew down several power lines as well as trees just east of Greenfield.

Thunderstorm Wind in JERSEY, ILLINOIS
From 27-JUN-10 17:22:00 to 27-JUN-10 17:22:00 (CST-6)
Location: MONUMENT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds blew down tree limbs up to 18 inches in diameter in Pere Marquette Park.

Flash Flood in BOND, ILLINOIS
From 27-JUN-10 18:41:00 to 28-JUN-10 00:30:00 (CST-6)
Location: SORENTO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to five inches of rain fell in a short amount of time on already saturated soils causing flash flooding.  Numerous roads were flooded including streets in Greenville and Illinois Route 127 near Reno.  Also, Illinois Route 140 between Smithboro and Mulberry Grove had several inches of water flowing over it.

Thunderstorm Wind in MADISON, ILLINOIS
From 27-JUN-10 18:15:00 to 27-JUN-10 18:15:00 (CST-6)
Location: EAST ALTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds blew down numerous large tree limbs around town.

Thunderstorm Wind in FAYETTE, ILLINOIS
From 27-JUN-10 17:55:00 to 27-JUN-10 18:00:00 (CST-6)
Location: VANDALIA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down numerous large trees, tree limbs and power lines in Vandalia and St. Elmo.

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 27-JUN-10 18:55:00 to 27-JUN-10 18:55:00 (CST-6)
Location: BELLEVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused some minor shingle damage to a building in town.

Thunderstorm Wind in CLINTON, ILLINOIS
From 27-JUN-10 19:26:00 to 27-JUN-10 19:26:00 (CST-6)
Location: NEW BADEN
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BOND, ILLINOIS
From 27-JUN-10 18:30:00 to 27-JUN-10 19:10:00 (CST-6)
Location: OLD RIPLEY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down numerous large trees across the county.

Flash Flood in FAYETTE, ILLINOIS
From 27-JUN-10 20:23:00 to 28-JUN-10 00:30:00 (CST-6)
Location: BINGHAM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to six inches of rain fell in a short amount of time on already saturated soils causing flash flooding.  Numerous roads were flooded including U.S. Highway 51 both north and south of Vandalia.  Up to 100 homes and businesses sustained damage from the flooding in Vandalia.  Though most of the homes that sustained damage was due to water and sewer backup.  Some businesses did have substantial flooding and the city garage had 18 inches of water inside and two squad cars parked outside the garage were damaged when they were submerged in the flood waters. Also, several water rescues had to be done as people drove around barricades and attempted to drive through the flooded streets. Some of the flooding in town was due to a 10 foot culvert under a railroad bed that was bent due to the large flow of water through it actually forcing the culvert up into the air, this stopped up the flow of water and backed the water up into properties on that side of town.  No injuries were reported.