Radar:       Or click here for map
Radar: Bismarck ND
46.77 N - 100.75W
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
3665
331 32
Wind
1983
322 21
Tornadoes
598
32 10
Total
6246
685 40
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
N/A
1:209
Sig Severe
52
1:1,904
Tornadoes
74
1:2,181
F2+ Torn
N/A
1:40,757
* 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: 207%
10 year report increase: 93%
5 year report increase: -10%

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:
3.3 on 18 Jul

Primary Season:
May 25 - Sep 06

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:
12% at 00 UTC

See hourly table below

Climatological Threat Potential
Threat
Avg Prob of Occurrence
Return Interval
Natl Rank
Any Tornado
0.005%
21715 yrs
N/A
F2+ Tornado
0.003%
29376 yrs
N/A
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
99
31
63
24
37
7
173
41
1981
40
19
56
22
12
7
64
32
1982
66
20
68
27
11
8
88
37
1983
84
25
111
30
23
9
130
39
1984
28
16
33
15
13
9
54
29
1985
65
23
52
21
33
13
131
33
1986
77
26
42
17
28
15
133
38
1987
57
14
36
16
10
5
77
22
1988
53
21
34
19
16
9
85
31
1989
69
23
48
18
5
5
79
31
1990
82
30
54
23
23
11
128
39
1991
106
31
67
27
15
12
136
40
1992
76
22
15
11
9
6
94
27
1993
77
24
40
19
36
11
149
36
1994
93
36
51
21
23
15
139
49
1995
71
27
80
22
16
11
103
33
1996
136
35
68
18
30
13
196
39
1997
140
40
94
26
29
14
198
46
1998
127
31
29
13
20
12
167
33
1999
199
39
94
20
47
15
293
40
2000
269
48
84
23
23
10
315
53
2001
289
46
181
22
33
11
355
50
2002
265
45
158
31
19
8
303
50
2003
188
37
74
14
19
10
226
41
2004
248
48
55
14
23
8
294
49
2005
333
49
187
26
31
13
395
53
2006
328
54
109
33
14
7
356
61
AVG
136
32
73
21
22
10
231
40


Violent Tornadoes
Date
F
Deaths
Injuries
2002 24-Jun 0124 UTC
F4
0
0
2002 11-Aug 2100 UTC
F4
0
0
2004 19-Jul 0125 UTC
F4
0
0

Monthly Averages
Month
Hail
Wind
Torn
Total
Jan
0
0
0
0
Feb
0
0
0
0
Mar
0
0
0
0
Apr
1
1
0
2
May
13
5
2
19
Jun
38
18
9
66
Jul
42
28
7
76
Aug
35
19
3
58
Sep
7
2
0
9
Oct
0
0
0
1
Nov
0
0
0
0
Dec
0
0
0
0

Hourly Averages
UTC
Hail
Wind
Torn
Total
00
485
158
85
728
01
455
184
72
711
02
417
232
67
716
03
258
194
39
491
04
140
185
28
353
05
135
153
14
302
06
72
131
8
211
07
67
127
6
200
08
80
84
4
168
09
68
50
2
120
10
58
54
5
117
11
55
33
1
89
12
41
28
1
70
13
47
26
1
74
14
42
9
1
52
15
37
7
2
46
16
31
9
2
42
17
37
9
2
48
18
40
9
13
62
19
61
16
28
105
20
110
26
44
180
21
212
56
34
302
22
270
85
47
402
23
447
118
92
657

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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