Illinois, 1984

Tornadoes and Hail in Illinois, April 27, 1984

April 27, 1984 · NWS MT · 17 events in 14 counties and zones

11 hail, 5 tornado, 1 thunderstorm wind, 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
1
Injuries
5
Property damage
$5.3 million
Crop damage
None recorded
Events
17

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

11 hail, 5 tornado, 1 thunderstorm wind. Local standard time, as filed.

Hail, Macoupin

When
April 27, 1:18 PM CST
Where
Macoupin County
Measured
1 in hail
Coordinates
39.030, -89.950

Hail, Macoupin

When
April 27, 1:40 PM CST
Where
Macoupin County
Measured
1.75 in hail
Coordinates
39.130, -89.830

Hail, Christian

When
April 27, 3:30 PM CST
Where
Christian County
Measured
0.75 in hail
Coordinates
39.480, -89.200

Hail, Shelby

When
April 27, 4:38 PM CST
Where
Shelby County
Measured
1 in hail
Coordinates
39.430, -88.800

Hail, De Kalb

When
April 27, 4:55 PM CST
Where
De Kalb County
Measured
1 in hail
Coordinates
41.880, -88.750

Tornado, Grundy

When
April 27, 5:10 PM CST
Where
Grundy County
Rating
F1
Path length
2.7 mi
Path width
150 yd
Property damage
$250,000
Coordinates
41.430, -88.300

Hail, Kane

When
April 27, 5:12 PM CST
Where
Kane County
Measured
0.75 in hail
Coordinates
41.930, -88.380

Hail, Cumberland

When
April 27, 5:29 PM CST
Where
Cumberland County
Measured
1.75 in hail
Coordinates
39.220, -88.170

Hail, Marion

When
April 27, 5:32 PM CST
Where
Marion County
Measured
0.75 in hail
Coordinates
38.530, -89.130

Tornado, Kendall

When
April 27, 5:39 PM CST
Where
Kendall County
Rating
F3
Path length
5 mi
Path width
200 yd
Property damage
$2.5 million
Coordinates
41.550, -88.330

Thunderstorm Wind, McHenry

When
April 27, 5:40 PM CST
Where
McHenry County
Measured
59 kt (68 mph)
Coordinates
42.320, -88.450

Tornado, Will

When
April 27, 5:50 PM CST
Where
Will County
Rating
F3
Path length
4 mi
Path width
200 yd
Deaths
1 direct, 0 indirect
Injuries
5 direct, 0 indirect
Property damage
$2.5 million
Coordinates
41.580, -88.250

Hail, Marion

When
April 27, 5:50 PM CST
Where
Marion County
Measured
0.75 in hail
Coordinates
38.720, -88.870

Tornado, Will

When
April 27, 6:10 PM CST
Where
Will County
Rating
F1
Path length
1 mi
Path width
100 yd
Property damage
$25,000
Coordinates
41.430, -88.230

Hail, Clay

When
April 27, 6:30 PM CST
Where
Clay County
Measured
1 in hail
Coordinates
38.830, -88.620

Tornado, Effingham

When
April 27, 6:35 PM CST
Where
Effingham County
Rating
F0
Path length
0.3 mi
Path width
30 yd
Property damage
$30
Coordinates
39.120, -88.530

Hail, Clark

When
April 27, 8:30 PM CST
Where
Clark County
Measured
1.75 in hail
Coordinates
39.470, -87.600

The people who died

As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.

EventDateAgeSexWhereKind
Tornado, Will1984-04-27Direct

What these are

Hail
Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
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.
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.

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

The same day elsewhere

More

Every storm in Illinois in 1984Every state in 1984This day in weather historyThe tornado archive for Illinois, 1984

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: 10004407, 10004408, 10004409, 10004410, 10004411, 10004412, 10004413, 10004414, 10004415, 10004416, 10004417, 10004418, 10004419, 10004420, 10004421, 10004422, 10004423.