Thunderstorms developed along an outflow boundary across west-central Illinois during the afternoon of September 2nd into the early morning hours of September 3rd.  A moderately unstable airmass and an approaching upper level disturbance resulted in a few severe thunderstorms with large hail and damaging wind gusts.  In addition, locally heavy rainfall of between 2 and 5 inches was common with the storms, which produced areas of flash flooding.

Thunderstorm Wind in SANGAMON, ILLINOIS
From 02-SEP-10 15:45:00 to 02-SEP-10 15:50:00 (CST-6)
Location: SOUTHLAWN
Magnitude: 52.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Mesonet

Several large trees were snapped near I-55 and Stevenson Drive.  A tree was blown onto a house on East Lake Shore Drive.

Thunderstorm Wind in MACON, ILLINOIS
From 02-SEP-10 18:05:00 to 02-SEP-10 18:10:00 (CST-6)
Location: ELWIN
Magnitude: 52.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown onto a house in Elwin.  In addition, numerous tree limbs and powerlines were knocked down.

Flash Flood in CASS, ILLINOIS
From 02-SEP-10 15:30:00 to 02-SEP-10 23:30:00 (CST-6)
Location: VIRGINIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Heavy rainfall rates of 2.00 to 2.50 per hour for nearly 90 minutes resulted in flash flooding across southern Cass County. Most rural roads were impassable due to the heavy rain.

Flash Flood in CHRISTIAN, ILLINOIS
From 02-SEP-10 17:30:00 to 03-SEP-10 00:00:00 (CST-6)
Location: ILLIOPOLIS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rainfall rates of 2.00 to 2.50 per hour for nearly two hours resulted in flash flooding across northern Christian County. Most rural roads in and near the town of Mount Auburn were impassable due to the heavy rain.

Hail in CASS, ILLINOIS
From 02-SEP-10 14:20:00 to 02-SEP-10 14:21:00 (CST-6)
Location: ARENZVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in MENARD, ILLINOIS
From 02-SEP-10 16:45:00 to 02-SEP-10 23:30:00 (CST-6)
Location: TALLULA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Heavy rainfall rates of 2.00 to 2.50 per hour for nearly 90 minutes resulted in flash flooding across southern Menard County. Most rural roads were impassable due to the heavy rain.

Flash Flood in SANGAMON, ILLINOIS
From 02-SEP-10 17:30:00 to 03-SEP-10 00:00:00 (CST-6)
Location: PLEASANT PLAINS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Heavy rainfall rates of 1.50 to 2.00 per hour for nearly 90 minutes resulted in flash flooding across northern Sangamon County, including the city of Springfield. Most roads and viaducts were impassable due to the heavy rain. Maximum rainfall totals reached 3.00 inches along the Sangamon River in eastern parts of the county.

Flash Flood in SANGAMON, ILLINOIS
From 02-SEP-10 19:30:00 to 03-SEP-10 02:00:00 (CST-6)
Location: LOWDER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rainfall rates of 2.00  per hour for nearly two hours resulted in flash flooding across southern Sangamon County. Most rural roads were impassable due to the heavy rain. Nearly three feet of standing water flooded the football and baseball fields at Pawnee High School.

Flash Flood in CHRISTIAN, ILLINOIS
From 02-SEP-10 20:30:00 to 03-SEP-10 04:00:00 (CST-6)
Location: SICILY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Heavy rainfall rates of 2.00 to 2.50 per hour for nearly two hours resulted in flash flooding across the southern half of Christian County, including the city of Taylorville. Most roads were impassable due to the heavy rain. Maximum rainfall amounts reached 4.00 to 5.00 inches in southeast and eastern parts of the county from Assumption to Pana.

Flash Flood in SHELBY, ILLINOIS
From 02-SEP-10 21:00:00 to 03-SEP-10 04:00:00 (CST-6)
Location: MOWEAQUA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rainfall rates of 1.00 to 1.50 per hour for three hours in the late evening resulted in flash flooding across the northern half of Shelby County. State highway 16 and 128 both had nearly a foot of flowing water, and most other rural roads were impassable due to the heavy rain.

Flash Flood in MOULTRIE, ILLINOIS
From 02-SEP-10 21:00:00 to 03-SEP-10 04:00:00 (CST-6)
Location: KIRKSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rainfall rates of 1.00 to 1.50 per hour for three hours during the late evening resulted in flash flooding across southern Moultrie County. Parts of state highway 16, 32 and 121 had nearly a foot of water flowing over them, and most rural roads in the county were impassable due to the heavy rain.

Flash Flood in COLES, ILLINOIS
From 02-SEP-10 21:00:00 to 03-SEP-10 04:00:00 (CST-6)
Location: COOKS MILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Heavy rainfall rates of 1.00 to 1.50 per hour for nearly three hours during the late evening resulted in flash flooding across western Coles County. Parts of state highway 16 and 121 had nearly a foot of water flowing over them, and most rural roads in the county were impassable due to the heavy rain. Significant street flooding was also reported in Mattoon. Maximum rainfall amounts ranged from 3.00 to 4.00 inches.

Hail in CASS, ILLINOIS
From 02-SEP-10 14:47:00 to 02-SEP-10 14:48:00 (CST-6)
Location: PHILADELPHIA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in SANGAMON, ILLINOIS
From 02-SEP-10 16:46:00 to 02-SEP-10 16:47:00 (CST-6)
Location: SPRINGFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCLEAN, ILLINOIS
From 02-SEP-10 17:19:00 to 02-SEP-10 17:20:00 (CST-6)
Location: BLOOMINGTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MCLEAN, ILLINOIS
From 02-SEP-10 17:20:00 to 02-SEP-10 17:25:00 (CST-6)
Location: BLOOMINGTON
Magnitude: 52.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous powerlines were blown down in the city of Bloomington.

Hail in MCLEAN, ILLINOIS
From 02-SEP-10 17:23:00 to 02-SEP-10 17:24:00 (CST-6)
Location: BLOOMINGTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in CHRISTIAN, ILLINOIS
From 02-SEP-10 18:15:00 to 02-SEP-10 18:20:00 (CST-6)
Location: KINCAID
Magnitude: 52.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown onto a house in Kincaid at the 300 block of West Elm Street.

Thunderstorm Wind in MACON, ILLINOIS
From 02-SEP-10 18:10:00 to 02-SEP-10 18:15:00 (CST-6)
Location: KNIGHTS
Magnitude: 52.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several tree tops were ripped off and powerlines were blown down in the South Shores area of Decatur.

Lightning in MCLEAN, ILLINOIS
From 02-SEP-10 17:20:00 to 02-SEP-10 17:21:00 (CST-6)
Location: BLOOMINGTON
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Newspaper

A lightning strike occurred in the 300 block of St. Joseph Drive in Bloomington.  The resulting fire caused approximately $50,000 in damages to the roof of a physician's office building.