A mesoscale convective complex developed and moved east across the forecast area.  There were numerous reports of damaging winds, large hail, flash flooding and one tornado.

Hail in MADISON, ILLINOIS
From 03-APR-14 19:44:00 to 03-APR-14 19:44:00 (CST-6)
Location: PONTOON BEACH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MADISON, ILLINOIS
From 03-APR-14 19:50:00 to 03-APR-14 20:05:00 (CST-6)
Location: COLLINSVILLE
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down a tree across a road two miles south of St. Jacob.

Hail in MARION, ILLINOIS
From 03-APR-14 21:50:00 to 03-APR-14 21:50:00 (CST-6)
Location: WALNUT HILL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in WASHINGTON, ILLINOIS
From 03-APR-14 16:30:00 to 04-APR-14 05:30:00 (CST-6)
Location: VENEDY STATION
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to four inches of rain fell in a short amount of time causing flash flooding. Numerous roads were flooded including the intersection of Highway 1 and Beaver Creek Road, about two miles east of Addieville.  Also, County Road 6 east of Venedy had water flowing over it.

Flash Flood in MONROE, ILLINOIS
From 03-APR-14 17:00:00 to 04-APR-14 05:30:00 (CST-6)
Location: BIXBY
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 causing flash flooding.  Numerous roads were flooded including several around the Waterloo area.

Flash Flood in MARION, ILLINOIS
From 03-APR-14 17:00:00 to 04-APR-14 05:30:00 (CST-6)
Location: CENTRALIA
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 causing flash flooding.  Numerous low water crossings were flooded.

Thunderstorm Wind in CLINTON, ILLINOIS
From 03-APR-14 05:55:00 to 03-APR-14 05:55:00 (CST-6)
Location: SHATTUC
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds destroyed 3 large barns on a farm at the intersection of Meridian Road and County Road 1500N. It was on the west side of Meridian Road in Clinton County. Meridian Road is the county line between Clinton County and Marion County.  Six out of 600 cows died in one of the barns.

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 03-APR-14 04:45:00 to 03-APR-14 04:45:00 (CST-6)
Location: BELLEVILLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down several large trees as well as numerous tree limbs and power lines.  One tree fell onto a house causing moderate damage.  Another tree fell onto an unoccupied car crushing it.  A two and a half foot diameter pine tree was snapped.

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 03-APR-14 19:36:00 to 03-APR-14 19:45:00 (CST-6)
Location: CENTERVILLE
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew over a truck pulling a trailer about two miles west of Fairview Heights.

Thunderstorm Wind in MARION, ILLINOIS
From 03-APR-14 05:55:00 to 03-APR-14 05:55:00 (CST-6)
Location: JUNCTION CITY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds uprooted one large tree and caused minor damage to a nearby home.  Also, further northeast a lean-to was destroyed with the debris thrown into a nearby field, power lines and a pickup truck.