Tornado Outbreak of April 19, 1996

On April 19, 1996, Illinois recorded its largest tornado outbreak on record. Across the state, 39 tornadoes were observed. These tornadoes were part of a larger outbreak across the Midwest.

Four of these tornadoes occured in the forecast area covered by the NWS office in Chicago (also known as its 'County Warning Area' or CWA). A tornado in Zion rated F2 on the original Fujita Scale produced significant damage and resulted in two injuries.

The Zion tornado was somewhat unusual in multiple respects. First, as seen in the map above, it was by far the most northern of all the tornadoes during the event. It also was by far the latest tornado during the event, occurring about two hours after the previous tornado. Additionally, the tornado was rated as F2 which is considered a strong tornado, yet it was very short lived and occurred as part of a bowing line of storms rather than from an isolated supercell, as seen in this loop of Doppler radar Reflectivity (left side) and Base Velocity (right side):

Radar loop of Zion, IL tornado

**4/19/1996 Tornado Summary for NWS Chicago County Warning Area**
Location	County	F-Scale	Time (CST)
Rutland	LaSalle	F1	4:40-4:41 PM	More information
Herscher	Kankakee	F0	5:25-5:29 PM	More information
Momence	Kankakee	F0	6:01-6:08 PM	More information
Zion	Lake, IL	F2	10:32-10:35 PM	More information

Most of the Illinois tornadoes on this day occurred in areas covered by other National Weather Service offices. Here is some additional information about the event from those offices: