Tornado record · Original Fujita scale

F4 tornado, Boone County, Illinois, April 21, 1967

RatingF4

Deaths24

Injuries450

Length25.5 mi

Width1,200 yd

See tornadoes near here

Map

Path

The path

Drawn as a straight line from the recorded start point (42.22, -88.92) to the end point (42.35, -88.43), which is all NOAA's record holds. The real track may have curved.

The record

Date: April 21, 1967, 3:50 PM (as recorded, Central Standard Time)
Rating: F4
States: Illinois
Counties: Boone County, McHenry County
Path: 25.5 miles long, up to 1,200 yards wide
Casualties: 24 deaths, 450 injuries

Same day

Other tornadoes on April 21, 1967

Tornadoes, newest first
Date	Rating	State	Path length	Width	Deaths	Injuries
Apr 21, 1967	F4	Missouri	59 mi	500 yd	0	2
Apr 21, 1967	F4	Illinois	8.8 mi	150 yd	1	100
Apr 21, 1967	F4	Illinois	15 mi	200 yd	33	500
Apr 21, 1967	F4	Michigan	12 mi	50 yd	0	8
Apr 21, 1967	F3	Missouri	14.6 mi	440 yd	0	0
Apr 21, 1967	F3	Iowa	0.1 mi	200 yd	0	0
Apr 21, 1967	F3	Michigan	13.6 mi	400 yd	0	32
Apr 21, 1967	F2	Missouri	8.4 mi	90 yd	0	0
Apr 21, 1967	F2	Missouri	6.3 mi	50 yd	0	7
Apr 21, 1967	F2	Missouri	3 mi	200 yd	0	0
Apr 21, 1967	F2	Missouri	20.4 mi	100 yd	0	0
Apr 21, 1967	F2	Iowa	32.8 mi	100 yd	0	0
Apr 21, 1967	F2	Illinois	25.1 mi	300 yd	0	0
Apr 21, 1967	F2	Illinois	4.5 mi	300 yd	0	0
Apr 21, 1967	F2	Illinois	5.6 mi	77 yd	0	0
Apr 21, 1967	F2	Illinois	0.3 mi	30 yd	0	1
Apr 21, 1967	F2	Illinois	2.68 mi	115 yd	0	5
Apr 21, 1967	F2	Indiana	6.3 mi	10 yd	0	2
Apr 21, 1967	F2	Illinois	0.3 mi	10 yd	0	0
Apr 21, 1967	F2	Michigan	18.6 mi	50 yd	0	4
Apr 21, 1967	F2	Michigan	14.5 mi	500 yd	0	1
Apr 21, 1967	F2	Michigan	1 mi	27 yd	0	0
Apr 21, 1967	F2	Michigan	0.1 mi	33 yd	0	6
Apr 21, 1967	F2	Michigan	0.3 mi	27 yd	0	0
Apr 21, 1967	F2	Michigan	10.9 mi	10 yd	0	0
Apr 21, 1967	F1	Missouri	0.2 mi	10 yd	0	0
Apr 21, 1967	F1	Indiana	0.1 mi	10 yd	0	0
Apr 21, 1967	F1	Missouri	0.1 mi	50 yd	0	0
Apr 21, 1967	F1	Missouri	0.1 mi	10 yd	0	0
Apr 21, 1967	F1	Illinois	0.3 mi	30 yd	0	0
Apr 21, 1967	F1	Illinois	1 mi	13 yd	0	0
Apr 21, 1967	F1	Illinois	5.6 mi	100 yd	0	0
Apr 21, 1967	F1	Illinois	0.5 mi	150 yd	0	0
Apr 21, 1967	F1	Illinois	2 mi	40 yd	0	0
Apr 21, 1967	F1	Illinois	0.5 mi	10 yd	0	0
Apr 21, 1967	F1	Illinois	6.8 mi	20 yd	0	0
Apr 21, 1967	F1	Illinois	0.3 mi	10 yd	0	0
Apr 21, 1967	F1	California	0.1 mi	10 yd	0	0
Apr 21, 1967	F1	Michigan	0.1 mi	10 yd	0	0
Apr 21, 1967	F1	Illinois	0.1 mi	10 yd	0	0
Apr 21, 1967	F0	Missouri	1 mi	10 yd	0	0
Apr 21, 1967	F0	Missouri	0.1 mi	10 yd	0	0
Apr 21, 1967	F0	Missouri	0.1 mi	10 yd	0	0
Apr 21, 1967	F0	Michigan	0.1 mi	10 yd	0	0
Apr 21, 1967	F0	Indiana	0.1 mi	10 yd	0	0

Nearby

Tornado history nearby

Source: NOAA Storm Prediction Center severe weather database, 1950 to 2025.