Radar:       Or click here for map
Radar: Chicago IL
41.60 N - 88.08W
Period: 1980 - 2006      Range: 124 nm

Database Overview
All reports in the domain All severe weather reports during the period are plotted. Blue dots represent damaging wind, green dots represent large hail, and red dots represent tornadoes. [Click to enlarge]
  All Rpts Sig Rpts Avg Days
Hail
5007
264 33
Wind
9197
430 44
Tornadoes
1076
144 15
Total
15280
838 55
Significant severe reports Significant severe weather reports during the period are plotted. Only tornadoes F2 or stronger, wind gusts of 65 knots or stronger, and hail of 2" diameter or larger are plotted. [Click to enlarge]
Category
Rank*
Freq/mi2
Any Severe
38
1:85
Sig Severe
38
1:1,556
Tornadoes
30
1:1,212
F2+ Torn
37
1:9,057
* Compared to 141 national radar coverage areas studied.

Annual Report Information
Annual severe weather reports
Plot of annual severe weather reports in the search area. The dashed magenta line denotes a 5 year running average of all reports.

20 year report increase: 683%
10 year report increase: 232%
5 year report increase: 113%

See annual table below

Daily Report Information
Annual severe weather reports
Plot of daily severe weather reports in the search area. Lines denote a 7 day running mean.

Maximum daily value:
5.1 on 19 Jul

Primary Season:
May 05 - Aug 29

See monthly table below

Hourly Report Information
Annual severe weather reports
Plot of hourly severe weather reports in the search area. Values are in percent of total, and have been rounded to the nearest hour (UTC).

Maximum hourly value:
11% at 23 UTC

See hourly table below

Climatological Threat Potential
Threat
Avg Prob of Occurrence
Return Interval
Natl Rank
Any Tornado
0.024%
4178 yrs
46
F2+ Tornado
0.018%
5511 yrs
50
This table represents the average annual probability and return interval of each event for any point within the search domain.

Read details of computational method

Annual Totals
Year
Hail
Wind
Tornado
Total
 
Rpt
Days
Rpt
Days
Rpt
Days
Rpt
Days
1980
98
33
288
44
48
20
194
56
1981
48
18
125
35
42
18
132
44
1982
31
19
175
40
26
12
83
50
1983
46
15
272
37
15
12
76
44
1984
54
24
134
33
34
20
122
48
1985
87
24
152
29
14
11
115
39
1986
60
18
140
37
26
14
112
47
1987
75
22
235
43
33
16
141
48
1988
55
19
240
34
35
13
125
43
1989
62
21
185
34
18
9
98
43
1990
73
27
190
42
43
15
159
52
1991
125
25
276
45
44
20
213
53
1992
80
25
274
28
26
14
132
41
1993
112
28
327
54
38
16
188
59
1994
169
37
238
41
19
6
207
53
1995
134
32
286
49
64
14
262
54
1996
158
32
331
48
44
13
246
62
1997
95
25
425
38
32
10
159
44
1998
173
41
612
45
65
24
303
62
1999
184
41
377
44
38
10
260
54
2000
456
41
550
48
49
16
554
58
2001
282
46
514
55
35
13
352
70
2002
146
41
281
53
7
6
160
65
2003
575
46
574
57
102
26
779
65
2004
375
58
594
60
83
22
541
75
2005
344
53
613
52
25
10
394
65
2006
910
67
789
62
71
22
1052
84
AVG
185
33
341
44
40
15
566
55


Violent Tornadoes
Date
F
Deaths
Injuries
1981 30-Mar 0030 UTC
F4
0
0
1981 04-Apr 0604 UTC
F4
3
53
1983 04-Jul 0115 UTC
F4
0
0
1984 27-Apr 2239 UTC
F4
1
14
1984 08-Jun 0541 UTC
F5
9
200
1990 28-Aug 2030 UTC
F5
29
350
1994 27-Apr 0458 UTC
F4
3
70
1995 13-May 2255 UTC
F4
0
45
2004 13-Jul 1934 UTC
F4
0
3

Monthly Averages
Month
Hail
Wind
Torn
Total
Jan
0
2
0
2
Feb
1
2
0
3
Mar
16
9
1
27
Apr
35
24
8
67
May
46
49
11
106
Jun
29
78
10
116
Jul
24
87
5
116
Aug
19
50
3
72
Sep
8
19
1
28
Oct
5
7
0
11
Nov
1
6
0
8
Dec
0
1
0
1

Hourly Averages
UTC
Hail
Wind
Torn
Total
00
505
921
165
1591
01
391
791
121
1303
02
317
672
82
1071
03
266
470
50
786
04
169
432
16
617
05
95
300
33
428
06
100
303
13
416
07
90
254
13
357
08
71
213
8
292
09
41
188
4
233
10
34
143
3
180
11
36
102
3
141
12
35
128
1
164
13
50
108
2
160
14
59
107
2
168
15
52
120
8
180
16
76
126
7
209
17
120
125
10
255
18
181
207
23
411
19
272
350
44
666
20
392
578
84
1054
21
492
800
91
1383
22
563
880
125
1568
23
600
879
168
1647

Click Here for tabular data (F2+ tornadoes).
Page Updated: Saturday 10-27-2007
If you have comments regarding this information, contact John Hart of the Storm Prediction Center.
Go to SPC web page Go to NWS web site Go to NOAA web site