Radar:       Or click here for map
Radar: Des Moines IA
41.72 N - 93.72W
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
7715
 494 39
Wind
6950
 779 40
Tornadoes
1308
 194 18
Total
15973
 1467 56
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
30
1:82
Sig Severe
13
1:889
Tornadoes
11
1:997
F2+ Torn
20
1:6,723
* 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: 240%
10 year report increase: 236%
5 year report increase: -16%
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:
6.9 on 17 Jun

Primary Season:
Apr 02 - 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:
10% at 00 UTC
See hourly table below

Climatological Threat Potential
Threat
Avg Prob of Occurrence
Return Interval
Natl Rank
Any Tornado
0.034%
2917 yrs
23
F2+ Tornado
0.029%
3439 yrs
22
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
109
28
160
46
37
16
183
53
1981
94
26
86
28
34
16
162
39
1982
59
22
104
29
36
20
131
47
1983
50
19
141
42
31
14
112
48
1984
74
22
171
32
71
21
216
46
1985
99
31
132
34
26
15
151
48
1986
110
29
217
36
39
19
188
53
1987
95
34
120
41
33
20
161
56
1988
55
13
97
28
42
10
139
34
1989
94
30
219
33
34
12
162
44
1990
78
29
178
33
65
27
208
48
1991
119
32
213
40
55
17
229
55
1992
117
31
148
33
31
17
179
43
1993
147
42
343
46
57
23
261
68
1994
194
40
230
39
41
19
276
53
1995
165
35
168
37
44
15
253
50
1996
217
32
134
33
20
14
257
45
1997
163
35
222
32
18
14
199
53
1998
357
56
564
49
78
25
513
80
1999
361
43
246
36
67
18
495
56
2000
526
56
425
51
44
16
614
65
2001
891
55
480
52
103
19
1097
67
2002
586
53
399
51
31
15
648
68
2003
637
48
339
34
37
13
711
55
2004
1016
66
550
57
138
26
1292
80
2005
559
64
407
44
51
19
661
74
2006
743
71
457
57
45
15
833
81
AVG
286
39
257
40
48
18
592
56


Violent Tornadoes
Date
F
Deaths
Injuries
1980 02-Jun 2125 UTC
F4
0
0
1984 07-Jun 2345 UTC
F4
3
64
1986 28-Jul 2330 UTC
F4
0
2
1986 28-Sep 2234 UTC
F4
0
0
1989 24-May 2311 UTC
F4
0
0
1989 24-May 2320 UTC
F4
0
0
1989 31-May 0050 UTC
F4
0
3
1990 13-Mar 2253 UTC
F4
0
0
1995 28-May 0022 UTC
F4
0
0
1995 28-May 0055 UTC
F4
0
2
1995 28-May 0056 UTC
F4
0
1
1999 08-Apr 1954 UTC
F4
0
3
1999 08-Apr 2048 UTC
F4
0
1
2004 30-May 0330 UTC
F4
3
6

Monthly Averages
Month
Hail
Wind
Torn
Total
Jan
0
0
0
0
Feb
0
1
0
1
Mar
12
9
2
22
Apr
46
24
6
76
May
84
36
13
133
Jun
63
72
14
149
Jul
34
60
7
100
Aug
20
34
3
57
Sep
19
15
2
36
Oct
4
3
0
7
Nov
1
2
1
4
Dec
0
0
0
1

Hourly Averages
UTC
Hail
Wind
Torn
Total
00
902
572
166
1640
01
761
587
155
1503
02
620
608
135
1363
03
480
490
67
1037
04
338
471
37
846
05
237
400
30
667
06
166
341
12
519
07
134
270
13
417
08
86
158
8
252
09
90
160
7
257
10
89
111
4
204
11
68
99
5
172
12
114
80
6
200
13
86
72
5
163
14
125
70
0
195
15
160
119
2
281
16
185
134
12
331
17
226
141
17
384
18
233
169
37
439
19
251
227
63
541
20
355
296
100
751
21
489
395
132
1016
22
660
457
154
1271
23
860
523
141
1524

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