Radar:       Or click here for map
Radar: Grand Fords ND
47.52 N - 97.32W
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
4963
322 30
Wind
2624
373 20
Tornadoes
728
62 11
Total
8315
757 36
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
1:157
Sig Severe
46
1:1,723
Tornadoes
63
1:1,792
F2+ Torn
N/A
1:21,036
* 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: 328%
10 year report increase: 87%
5 year report increase: -44%

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:
4.6 on 23 Jun

Primary Season:
May 06 - Sep 09

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
0.005%
20451 yrs
N/A
F2+ Tornado
0.004%
28306 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
88
23
60
21
7
5
102
32
1981
37
19
17
11
17
12
71
27
1982
83
25
79
21
12
6
107
33
1983
81
25
93
25
17
10
115
36
1984
59
19
34
15
18
9
95
27
1985
104
29
30
17
30
13
164
34
1986
62
22
45
19
20
9
102
33
1987
55
15
43
13
27
12
109
25
1988
63
24
56
26
19
12
101
35
1989
49
20
38
13
5
3
59
26
1990
45
17
45
12
11
7
67
22
1991
89
26
64
21
25
12
139
36
1992
69
20
15
11
16
8
101
25
1993
21
11
34
16
38
11
97
28
1994
87
25
66
21
18
11
123
35
1995
21
14
31
14
9
8
39
25
1996
188
36
73
15
30
13
248
38
1997
216
37
83
24
24
11
264
44
1998
260
32
73
21
22
12
304
35
1999
348
39
187
24
45
10
438
41
2000
380
37
99
21
15
8
410
38
2001
562
48
350
34
54
12
670
52
2002
512
51
207
41
40
19
592
55
2003
322
39
188
17
33
15
388
40
2004
366
48
113
19
62
19
490
53
2005
415
47
371
32
82
20
579
53
2006
381
51
130
28
32
15
445
55
AVG
184
30
97
20
27
11
308
36


Violent Tornadoes
Date
F
Deaths
Injuries
1999 06-Jun 2020 UTC
F4
0
0
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
1
Apr
3
1
0
4
May
21
7
3
31
Jun
45
26
10
81
Jul
51
34
8
94
Aug
48
24
4
76
Sep
13
5
1
18
Oct
1
1
0
1
Nov
0
0
0
0
Dec
0
0
0
0

Hourly Averages
UTC
Hail
Wind
Torn
Total
00
584
161
119
864
01
506
227
88
821
02
386
209
54
649
03
275
204
30
509
04
205
222
24
451
05
178
163
11
352
06
117
180
13
310
07
98
175
7
280
08
101
104
5
210
09
63
69
5
137
10
55
83
4
142
11
57
84
0
141
12
67
53
0
120
13
72
37
2
111
14
83
29
4
116
15
80
43
2
125
16
99
47
10
156
17
117
45
0
162
18
97
38
14
149
19
133
34
33
200
20
215
52
51
318
21
343
93
71
507
22
450
136
87
673
23
582
136
94
812

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