Episode narrative: During the afternoon and evening of the 31st, a wave of severe thunderstorms produced numerous tornadoes, severe hail, extensive wind damage, and localized flooding across northern and northeastern Illinois. A total of 37 tornadoes were confirmed across the state. The NWS Chicago office tied a record for the most tornadoes to occur in a single calendar day within the office's county warning area with 22, 17 of which occurred in Illinois. One EF-2 tornado occurred in south-central Lee County and two others in northwest Indiana. Some of the more notable damage includes multiple semi trucks blown over, a garage that had been completely destroyed southeast of Amboy, and the partial roof collapse of the Apollo Theatre in Belvidere which unfortunately resulted in one fatality and 40 injuries.

Tornado event in BOONE County, ILLINOIS
Start: 31-MAR-23 18:37:00
End: 31-MAR-23 18:50:00
Direct deaths: 1
Property damage: 0.00K
Event narrative: This tornado crossed into Boone County south of Cherry Valley from Winnebago County. The tornado, which originated in Ogle County, traversed northeastward doing minor damage to farms. As it moved through the town of Belvidere, the storm produced multiple instances of damage to businesses, homes, and trees. Included in this is the partial roof collapse of the Apollo Theatre downtown which resulted in one fatality and 40 injuries. From there, the tornado would travel another 7 miles doing additional damage to trees before lifting near Orth Rd just west of the Boone-McHenry county line.

Tornado event in WINNEBAGO County, ILLINOIS
Start: 31-MAR-23 18:33:00
End: 31-MAR-23 18:42:00
Direct deaths: 0
Property damage: 0.00K
Event narrative: This tornado began southwest of the intersection of Elmwood Rd and Rockton Ave on the north side of Rockford and tracked northeastward for almost 9 miles, straddling the Rock River as it tracked through the west side of Machesney Park before weakening and lifting over Roscoe. This tornado caused damage to several trees and outbuildings, as well as multiple homes, which primarily suffered roof damage. A couple of homes had entire portions of their roofs removed where the tornado was at its peak intensity and featured 90-100 mph winds.

Tornado event in KANE County, ILLINOIS
Start: 31-MAR-23 18:57:00
End: 31-MAR-23 19:01:00
Direct deaths: 0
Property damage: 0.00K
Event narrative: Just a couple of minutes after touching down in far northern Kendall County, this tornado crossed into Kane County in Montgomery just west of Albright Rd. The tornado had caused minor damage to an outbuilding while still in Kendall County but most of the damage in Kane County was to trees. The tornado lifted on the south side of Aurora near the intersection of Hill Ave and Binder St.

Tornado event in KANE County, ILLINOIS
Start: 31-MAR-23 19:00:00
End: 31-MAR-23 19:02:00
Direct deaths: 0
Property damage: 0.00K
Event narrative: This tornado began in an open field south of Engstrom Family Park and tracked east northeast towards downtown Batavia before lifting shortly after it crossed the Fox River near Wilson St. Damage along the tornado's path consisted of several uprooted and damaged trees, downed fences, downed power lines, roof shingles peeled off of houses, and a toppled chimney.

Tornado event in WILL County, ILLINOIS
Start: 31-MAR-23 19:05:00
End: 31-MAR-23 19:07:00
Direct deaths: 0
Property damage: 0.00K
Event narrative: The tornado began near W 135th Street just west of Meadow Lane in Plainfield and tracked east-northeast before dissipating near the intersection of Golden Meadow Dr and Golden Sunset Dr just west of IL Rt. 59. The damage was confined to primarily trees, but some shingles and siding were removed from homes along the path.

Tornado event in DU PAGE County, ILLINOIS
Start: 31-MAR-23 19:17:00
End: 31-MAR-23 19:19:00
Direct deaths: 0
Property damage: 0.00K
Event narrative: The tornado dropped in an industrial park near N Main St just north of N North Ave on the far north side of Lombard. There, it caused roof damage to a couple of buildings. It continued on into the town of Addison where it caused roof damage to office buildings. The tornado then caused primarily tree damage as it tracked across a residential area of Addison south of Fullerton Ave before lifting as it crossed Fullerton Ave at Hale St. South and east of the tornado's track was a large swath of additional damage caused by straight line winds.