Short lines of thunderstorms developed ahead of a cold front that extended from the Chicago area southwest across the eastern Ozark Mountains of south central Missouri. Filtered sunshine allowed some warming and destabilization to occur ahead of developing thunderstorms over southeast Missouri. Organized storm structures evolved in an environment of moderate instability and rather strong deep-layer wind shear. Locally damaging winds accompanied small bowing lines of storms, especially north and west of the Marion/Carbondale area. A succession of thunderstorm complexes contributed to minor flooding along the Ohio River by the end of the month.

Thunderstorm Wind in JEFFERSON, ILLINOIS
From 26-APR-17 14:14:00 to 26-APR-17 14:17:00 (CST-6)
Location: MT VERNON
Magnitude: 61.00 MG
Crop damage: 0.00K
Reported by: Trained Spotter

Severe thunderstorm winds up to 70 mph spread rapidly northeast across the Mt. Vernon area. A trained spotter measured a wind gust to 70 mph about three miles south-southwest of Mt. Vernon. The public estimated a wind gust to 60 mph in Mt. Vernon.

Thunderstorm Wind in JEFFERSON, ILLINOIS
From 26-APR-17 14:20:00 to 26-APR-17 14:30:00 (CST-6)
Location: MT VERNON
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Severe thunderstorm winds to 70 mph affected much of eastern and northeastern Jefferson County. A trained spotter about five miles east of Mt. Vernon estimated winds gusted to at least 70 mph. Small hail was reported with the storm as well. About five miles north of Bluford near the Wayne County line, a trained spotter measured a wind gust to 58 mph, which downed small tree limbs. Large tree limbs were blown down in Bluford, including one limb which fell through the roof of a house.

Flood in ALEXANDER, ILLINOIS
From 27-APR-17 21:00:00 to 30-APR-17 23:59:00 (CST-6)
Location: CAIRO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Ohio River rose above flood stage. Through the end of April, the flooding was mostly minor. The river continued rising beyond the end of the month.

Flood in PULASKI, ILLINOIS
From 28-APR-17 21:00:00 to 30-APR-17 23:59:00 (CST-6)
Location: OLMSTED
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Ohio River rose above flood stage. Through the end of April, the flooding was mostly minor. The river continued rising beyond the end of the month.

Hail in JEFFERSON, ILLINOIS
From 26-APR-17 14:14:00 to 26-APR-17 14:17:00 (CST-6)
Location: MT VERNON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in PERRY, ILLINOIS
From 26-APR-17 13:15:00 to 26-APR-17 13:15:00 (CST-6)
Location: PINCKNEYVILLE
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Numerous trees and large limbs were blown down near Highway 154. Winds were estimated near 70 mph.

Thunderstorm Wind in JACKSON, ILLINOIS
From 26-APR-17 13:35:00 to 26-APR-17 13:35:00 (CST-6)
Location: MURPHYSBORO
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Department of Highways

A tree was down across the road.

Thunderstorm Wind in FRANKLIN, ILLINOIS
From 26-APR-17 14:00:00 to 26-APR-17 14:00:00 (CST-6)
Location: SESSER
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An overturned semi and trailer was reported along Highway 154.