Illinois, 1974

Tornadoes and Hail in Illinois, June 20, 1974

June 20, 1974 · 90 events in 35 counties and zones

60 thunderstorm wind, 22 tornado, 8 hail, as filed by the National Weather Service.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
$258,000
Crop damage
None recorded
Events
90

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

Event by event

60 thunderstorm wind, 22 tornado, 8 hail. Local standard time, as filed.

Hail, Ogle

When
June 20, 4:30 PM CST
Where
Ogle County
Measured
1 in hail
Coordinates
41.920, -89.480

Thunderstorm Wind, Jo Daviess

When
June 20, 4:34 PM CST
Where
Jo Daviess County
Coordinates
42.420, -90.420

Tornado, Jo Daviess

When
June 20, 4:45 PM CST
Where
Jo Daviess County
Rating
F0
Path width
33 yd
Coordinates
42.500, -89.980

Thunderstorm Wind, Jo Daviess

When
June 20, 4:45 PM CST
Where
Jo Daviess County
Coordinates
42.320, -90.220

Hail, Jo Daviess

When
June 20, 4:50 PM CST
Where
Jo Daviess County
Measured
0.75 in hail
Coordinates
42.500, -89.980

Thunderstorm Wind, Jo Daviess

When
June 20, 4:50 PM CST
Where
Jo Daviess County
Coordinates
42.500, -89.980

Thunderstorm Wind, Carroll

When
June 20, 4:55 PM CST
Where
Carroll County
Measured
52 kt (60 mph)
Coordinates
42.080, -90.150

Tornado, Whiteside

When
June 20, 5:00 PM CST
Where
Whiteside County
Rating
F0
Path width
33 yd
Coordinates
41.830, -90.170

Hail, Whiteside

When
June 20, 5:10 PM CST
Where
Whiteside County
Measured
1 in hail
Coordinates
41.620, -90.170

Thunderstorm Wind, Whiteside

When
June 20, 5:10 PM CST
Where
Whiteside County
Coordinates
41.620, -90.170

Tornado, Henry

When
June 20, 5:12 PM CST
Where
Henry County
Rating
F0
Path width
33 yd
Coordinates
41.520, -90.500

Thunderstorm Wind, Stephenson

When
June 20, 5:15 PM CST
Where
Stephenson County
Coordinates
42.320, -89.620

Thunderstorm Wind, Rock Island

When
June 20, 5:15 PM CST
Where
Rock Island County
Coordinates
41.400, -90.900

Thunderstorm Wind, Rock Island

When
June 20, 5:16 PM CST
Where
Rock Island County
Measured
59 kt (68 mph)
Coordinates
41.450, -90.520

Hail, Whiteside

When
June 20, 5:25 PM CST
Where
Whiteside County
Measured
1 in hail
Coordinates
41.800, -89.820

Thunderstorm Wind, Whiteside

When
June 20, 5:25 PM CST
Where
Whiteside County
Coordinates
41.800, -89.820

Thunderstorm Wind, Stephenson

When
June 20, 5:25 PM CST
Where
Stephenson County
Coordinates
42.420, -89.420

Thunderstorm Wind, Carroll

When
June 20, 5:25 PM CST
Where
Carroll County
Coordinates
41.970, -89.780

Tornado, Henry

When
June 20, 5:30 PM CST
Where
Henry County
Path width
33 yd
Property damage
$3,000
Coordinates
41.300, -90.370

Tornado, Henry

When
June 20, 5:30 PM CST
Where
Henry County
Rating
F0
Path length
1.5 mi
Path width
33 yd
Property damage
$250,000
Coordinates
41.230, -89.930

Thunderstorm Wind, Henry

When
June 20, 5:30 PM CST
Where
Henry County
Coordinates
41.300, -90.200

Thunderstorm Wind, Henry

When
June 20, 5:30 PM CST
Where
Henry County
Coordinates
41.480, -89.920

Thunderstorm Wind, Mercer

When
June 20, 5:30 PM CST
Where
Mercer County
Coordinates
41.200, -90.750

Thunderstorm Wind, Lee

When
June 20, 5:40 PM CST
Where
Lee County
Coordinates
41.720, -89.550

Tornado, Knox

When
June 20, 5:45 PM CST
Where
Knox County
Path width
33 yd
Property damage
$3,000
Coordinates
41.080, -90.300

Tornado, Lee

When
June 20, 5:45 PM CST
Where
Lee County
Path width
33 yd
Coordinates
41.780, -89.420

Tornado, Ogle

When
June 20, 5:45 PM CST
Where
Ogle County
Rating
F0
Path width
33 yd
Coordinates
42.120, -89.170

Thunderstorm Wind, Ogle

When
June 20, 5:45 PM CST
Where
Ogle County
Coordinates
42.020, -89.330

Thunderstorm Wind, Winnebago

When
June 20, 5:45 PM CST
Where
Winnebago County
Coordinates
42.270, -89.080

Tornado, Bureau

When
June 20, 5:50 PM CST
Where
Bureau County
Path width
33 yd
Property damage
$3,000
Coordinates
41.520, -89.400

Thunderstorm Wind, Bureau

When
June 20, 5:50 PM CST
Where
Bureau County
Coordinates
41.370, -89.470

Thunderstorm Wind, Winnebago

When
June 20, 5:50 PM CST
Where
Winnebago County
Measured
53 kt (61 mph)
Coordinates
42.200, -89.100

Thunderstorm Wind, Stark

When
June 20, 5:55 PM CST
Where
Stark County
Coordinates
41.070, -89.770

Thunderstorm Wind, Lee

When
June 20, 6:00 PM CST
Where
Lee County
Coordinates
41.770, -89.080

Thunderstorm Wind, Knox

When
June 20, 6:00 PM CST
Where
Knox County
Coordinates
40.980, -90.370

Thunderstorm Wind, Boone

When
June 20, 6:05 PM CST
Where
Boone County
Coordinates
42.400, -88.750

Thunderstorm Wind, Knox

When
June 20, 6:05 PM CST
Where
Knox County
Coordinates
40.830, -90.020

Thunderstorm Wind, La Salle

When
June 20, 6:05 PM CST
Where
La Salle County
Coordinates
41.550, -89.120

Tornado, Kane

When
June 20, 6:10 PM CST
Where
Kane County
Rating
F0
Path width
33 yd
Coordinates
42.030, -88.580

Thunderstorm Wind, La Salle

When
June 20, 6:10 PM CST
Where
La Salle County
Coordinates
41.330, -89.100

Thunderstorm Wind, De Kalb

When
June 20, 6:10 PM CST
Where
De Kalb County
Coordinates
41.930, -88.750

Thunderstorm Wind, Marshall

When
June 20, 6:15 PM CST
Where
Marshall County
Coordinates
41.030, -89.230

Thunderstorm Wind, Peoria

When
June 20, 6:15 PM CST
Where
Peoria County
Coordinates
40.920, -89.480

Thunderstorm Wind, McHenry

When
June 20, 6:15 PM CST
Where
McHenry County
Coordinates
42.320, -88.450

Thunderstorm Wind, De Kalb

When
June 20, 6:20 PM CST
Where
De Kalb County
Coordinates
41.670, -88.530

Thunderstorm Wind, Peoria

When
June 20, 6:20 PM CST
Where
Peoria County
Measured
55 kt (63 mph)
Coordinates
40.670, -89.680

Thunderstorm Wind, Kane

When
June 20, 6:20 PM CST
Where
Kane County
Coordinates
42.100, -88.380

Thunderstorm Wind, La Salle

When
June 20, 6:22 PM CST
Where
La Salle County
Measured
60 kt (69 mph)
Coordinates
41.330, -88.720

Tornado, Lake

When
June 20, 6:25 PM CST
Where
Lake County
Rating
F0
Path width
33 yd
Coordinates
42.420, -88.050

Hail, Kane

When
June 20, 6:25 PM CST
Where
Kane County
Measured
0.75 in hail
Coordinates
41.880, -88.300

Thunderstorm Wind, La Salle

When
June 20, 6:25 PM CST
Where
La Salle County
Coordinates
41.120, -88.830

Thunderstorm Wind, Lake

When
June 20, 6:25 PM CST
Where
Lake County
Coordinates
42.270, -88.130

Thunderstorm Wind, Kane

When
June 20, 6:26 PM CST
Where
Kane County
Measured
55 kt (63 mph)
Coordinates
41.900, -88.250

Thunderstorm Wind, Woodford

When
June 20, 6:30 PM CST
Where
Woodford County
Coordinates
40.720, -89.270

Thunderstorm Wind, Grundy

When
June 20, 6:30 PM CST
Where
Grundy County
Coordinates
41.370, -88.420

Thunderstorm Wind, Grundy

When
June 20, 6:35 PM CST
Where
Grundy County
Coordinates
41.450, -88.270

Thunderstorm Wind, Livingston

When
June 20, 6:35 PM CST
Where
Livingston County
Coordinates
40.830, -88.880

Thunderstorm Wind, Will

When
June 20, 6:35 PM CST
Where
Will County
Measured
75 kt (86 mph)
Coordinates
41.600, -88.200

Tornado, Du Page

When
June 20, 6:40 PM CST
Where
Du Page County
Path width
33 yd
Coordinates
41.820, -88.000

Tornado, Cook

When
June 20, 6:40 PM CST
Where
Cook County
Path width
33 yd
Coordinates
42.070, -87.930

Thunderstorm Wind, Lake

When
June 20, 6:40 PM CST
Where
Lake County
Coordinates
42.370, -87.830

Thunderstorm Wind, Livingston

When
June 20, 6:45 PM CST
Where
Livingston County
Coordinates
41.000, -88.520

Thunderstorm Wind, Cook

When
June 20, 6:45 PM CST
Where
Cook County
Measured
50 kt (58 mph)
Coordinates
42.080, -87.820

Hail, Cook

When
June 20, 6:49 PM CST
Where
Cook County
Measured
0.75 in hail
Coordinates
41.870, -87.650

Tornado, Will

When
June 20, 6:50 PM CST
Where
Will County
Rating
F0
Path width
33 yd
Coordinates
41.570, -87.820

Thunderstorm Wind, Will

When
June 20, 6:50 PM CST
Where
Will County
Coordinates
41.320, -88.150

Tornado, McLean

When
June 20, 6:53 PM CST
Where
McLean County
Rating
F0
Path width
33 yd
Coordinates
40.550, -88.500

Thunderstorm Wind, McLean

When
June 20, 6:55 PM CST
Where
McLean County
Coordinates
40.480, -88.980

Thunderstorm Wind, Will

When
June 20, 6:55 PM CST
Where
Will County
Coordinates
41.500, -87.630

Thunderstorm Wind, Livingston

When
June 20, 7:00 PM CST
Where
Livingston County
Coordinates
40.750, -88.520

Thunderstorm Wind, Kankakee

When
June 20, 7:10 PM CST
Where
Kankakee County
Coordinates
41.120, -87.850

Tornado, Knox

When
June 20, 7:15 PM CST
Where
Knox County
Rating
F1
Path width
33 yd
Coordinates
41.030, -90.100

Tornado, Iroquois

When
June 20, 7:20 PM CST
Where
Iroquois County
Rating
F0
Path width
33 yd
Coordinates
40.880, -87.830

Thunderstorm Wind, Iroquois

When
June 20, 7:20 PM CST
Where
Iroquois County
Coordinates
40.770, -87.980

Tornado, Iroquois

When
June 20, 7:30 PM CST
Where
Iroquois County
Rating
F0
Path width
33 yd
Coordinates
40.480, -88.070

Thunderstorm Wind, Iroquois

When
June 20, 7:35 PM CST
Where
Iroquois County
Coordinates
40.770, -87.570

Tornado, Knox

When
June 20, 8:00 PM CST
Where
Knox County
Rating
F0
Path width
33 yd
Coordinates
40.950, -90.300

Hail, Hancock

When
June 20, 8:15 PM CST
Where
Hancock County
Measured
1.75 in hail
Coordinates
40.580, -90.970

Thunderstorm Wind, Hancock

When
June 20, 8:15 PM CST
Where
Hancock County
Coordinates
40.580, -90.970

Thunderstorm Wind,

When
June 20, 8:15 PM CST
Where
County
Coordinates
40.550, -91.380

Tornado, Knox

When
June 20, 8:20 PM CST
Where
Knox County
Path width
33 yd
Coordinates
40.730, -90.400

Thunderstorm Wind, Hancock

When
June 20, 8:25 PM CST
Where
Hancock County
Coordinates
40.420, -91.130

Tornado, McDonough

When
June 20, 8:30 PM CST
Where
McDonough County
Rating
F0
Path width
33 yd
Coordinates
40.380, -90.830

Hail, McDonough

When
June 20, 8:34 PM CST
Where
McDonough County
Measured
1.75 in hail
Coordinates
40.420, -90.830

Thunderstorm Wind, Fulton

When
June 20, 8:35 PM CST
Where
Fulton County
Coordinates
40.700, -90.000

Tornado, Fulton

When
June 20, 8:40 PM CST
Where
Fulton County
Rating
F0
Path width
33 yd
Coordinates
40.530, -90.180

Thunderstorm Wind, McDonough

When
June 20, 8:40 PM CST
Where
McDonough County
Coordinates
40.470, -90.670

Thunderstorm Wind, Fulton

When
June 20, 8:45 PM CST
Where
Fulton County
Coordinates
40.400, -90.150

Thunderstorm Wind,

When
June 20, 8:45 PM CST
Where
County
Coordinates
40.550, -89.670

Thunderstorm Wind, Mason

When
June 20, 8:54 PM CST
Where
Mason County
Coordinates
40.270, -89.780

What these are

Hail
Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Thunderstorm Wind
Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Tornado
A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Illinois in 1974Every state in 1974This day in weather historyThe tornado archive for Illinois, 1974

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 10006876, 10006877, 10006878, 10006879, 10006880, 10006881, 10006882, 10006883, 10006884, 10006885, 10006886, 10006887, 10006888, 10006889, 10006890, 10006891, 10006892, 10006893, 10006894, 10006895, 10006896, 10006897, 10006898, 10006899, 10006900, 10006901, 10006902, 10006903, 10007751, 10007967, 10007968, 10007969, 10007970, 10007971, 10007972, 10007973, 10007974, 10007975, 10007976, 10007977, and more.