The remnants of Hurricane Isaac brought heavy rain and thunderstorms with isolated damaging winds. A southwesterly low level jet around 40 knots persisted along the southeastern flank of the circulation from Isaac. The stronger low level winds were co-located with an axis of moderate instability, where mixed-layer capes ranged from 1500 to 2000 j/kg. Within this region, numerous storms developed along low level convergence bands extending across southern Illinois. A discrete supercell in the extreme southern part of Illinois produced funnel clouds, and a bowing line segment caused scattered wind damage.

Flood in WILLIAMSON, ILLINOIS
From 01-SEP-12 16:30:00 to 01-SEP-12 19:30:00 (CST-6)
Location: HERRIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flooding occurred in Herrin, especially on a few residential streets east of Highway 148. Yards were flooded.

Heavy Rain in PERRY, ILLINOIS
From 01-SEP-12 13:06:00 to 01-SEP-12 17:06:00 (CST-6)
Location: SUNFIELD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported 2.75 inches of rain in a four-hour period.

Heavy Rain in SALINE, ILLINOIS
From 01-SEP-12 19:00:00 to 01-SEP-12 19:44:00 (CST-6)
Location: HARRISBURG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water was reported over the road at a street intersection in Harrisburg. Water was also over Highway 145 south of Harrisburg.

Funnel Cloud in ALEXANDER, ILLINOIS
From 01-SEP-12 17:41:00 to 01-SEP-12 17:41:00 (CST-6)
Location: CAIRO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wall cloud and funnel cloud were observed by the general public.

Funnel Cloud in PULASKI, ILLINOIS
From 01-SEP-12 17:58:00 to 01-SEP-12 17:58:00 (CST-6)
Location: AMERICA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A funnel cloud was seen crossing the Ohio River into northwest Ballard County, Kentucky.

Thunderstorm Wind in MASSAC, ILLINOIS
From 01-SEP-12 18:20:00 to 01-SEP-12 18:30:00 (CST-6)
Location: ROUND KNOB
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several large trees were blown down, and tree tops were blown out. About half the city of Metropolis was reported to be out of power. The highest wind gusts were estimated near 60 mph. The tree damage area included Joppa, Metropolis, and the Midway area.

Thunderstorm Wind in POPE, ILLINOIS
From 01-SEP-12 18:40:00 to 01-SEP-12 18:40:00 (CST-6)
Location: ROSEBUD
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Scattered tree limbs were blown down.

Heavy Rain in JEFFERSON, ILLINOIS
From 01-SEP-12 00:00:00 to 01-SEP-12 19:00:00 (CST-6)
Location: MT VERNON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a rainfall total of 5 inches over a period of about 18 hours.  Street flooding was reported in portions of the area.

Flash Flood in JACKSON, ILLINOIS
From 01-SEP-12 16:00:00 to 01-SEP-12 19:00:00 (CST-6)
Location: CARBONDALE
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash flooding occurred throughout much of the city. Street flooding was reported throughout downtown Carbondale. Highway 13 was closed through the middle of the city due to stranded vehicles in the road. Flash flooding occurred in front of the train station on U.S. Highway 51, where two cars were stalled out. A nearby theater was damaged by floodwater.  The automated observing system at the Carbondale airport measured 4.72 inches of rain from the remnants of Hurricane Isaac. Of that amount, 2.38 inches fell in a two-hour period.