Radar:       Or click here for map
Radar: Sioux Falls SD
43.58 N - 96.72W
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
7920
504 40
Wind
5374
625 34
Tornadoes
1244
181 15
Total
14538
1310 52
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
43
1:90
Sig Severe
17
1:996
Tornadoes
15
1:1,048
F2+ Torn
28
1:7,206
* 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: 126%
10 year report increase: 55%
5 year report increase: -27%

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:
7.0 on 21 Jun

Primary Season:
May 03 - 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 01 UTC

See hourly table below

Climatological Threat Potential
Threat
Avg Prob of Occurrence
Return Interval
Natl Rank
Any Tornado
0.023%
4352 yrs
47
F2+ Tornado
0.019%
5257 yrs
46
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
161
36
164
35
52
18
265
48
1981
90
29
102
28
35
13
160
35
1982
87
31
161
31
16
13
119
47
1983
45
16
162
27
23
11
91
33
1984
103
27
97
25
58
20
219
40
1985
98
30
142
30
65
20
228
51
1986
133
36
186
42
41
17
215
55
1987
89
31
101
29
27
14
143
47
1988
32
17
53
25
6
5
44
34
1989
80
27
108
31
11
7
102
48
1990
72
25
161
33
21
12
114
40
1991
169
36
169
45
41
18
251
59
1992
116
30
177
24
87
14
290
40
1993
133
35
159
34
78
18
289
45
1994
221
34
201
33
56
23
333
48
1995
99
30
114
28
14
10
127
40
1996
313
44
158
33
53
16
419
51
1997
236
44
213
35
37
14
310
52
1998
369
57
320
35
83
20
535
65
1999
350
46
190
36
39
15
428
54
2000
417
53
292
43
54
21
525
63
2001
716
54
319
41
81
21
878
63
2002
849
70
372
43
13
10
875
74
2003
485
43
324
27
118
12
721
46
2004
1097
72
302
44
79
19
1255
75
2005
834
67
370
40
26
15
886
72
2006
526
60
257
37
30
14
586
66
AVG
293
40
199
34
46
15
538
52


Violent Tornadoes
Date
F
Deaths
Injuries
1986 28-Jul 2330 UTC
F4
0
2
1992 16-Jun 2200 UTC
F5
1
35
1992 16-Jun 2218 UTC
F4
0
3
1993 07-Jun 2130 UTC
F4
0
5
1993 07-Jun 2140 UTC
F4
0
4
1995 28-May 0022 UTC
F4
0
0
1998 29-Mar 2150 UTC
F4
1
19
1998 31-May 0126 UTC
F4
6
150
2000 25-Jul 2257 UTC
F4
1
15
2003 24-Jun 0243 UTC
F4
1
0
2003 25-Jun 0029 UTC
F4
0
4

Monthly Averages
Month
Hail
Wind
Torn
Total
Jan
0
0
0
0
Feb
0
0
0
0
Mar
3
2
0
5
Apr
24
13
3
40
May
58
21
9
88
Jun
84
55
19
158
Jul
58
59
8
125
Aug
40
36
3
79
Sep
21
9
1
32
Oct
5
3
0
9
Nov
1
0
0
1
Dec
0
0
0
0

Hourly Averages
UTC
Hail
Wind
Torn
Total
00
912
449
185
1546
01
875
559
189
1623
02
692
529
151
1372
03
561
503
68
1132
04
419
438
37
894
05
262
374
21
657
06
219
339
11
569
07
190
259
6
455
08
123
163
6
292
09
105
137
6
248
10
97
85
7
189
11
81
59
3
143
12
79
69
0
148
13
77
52
2
131
14
91
65
4
160
15
95
77
1
173
16
107
83
7
197
17
121
59
2
182
18
139
47
7
193
19
190
88
37
315
20
362
107
62
531
21
503
201
96
800
22
728
275
136
1139
23
892
357
200
1449

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.
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