Radar:       Or click here for map
Radar: Alpena MI
44.90 N - 84.72W
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
1360
43 15
Wind
2520
115 19
Tornadoes
231
32 5
Total
4111
190 26
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
1:317
Sig Severe
N/A
1:6,864
Tornadoes
N/A
1:5,646
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: 570%
10 year report increase: 125%
5 year report increase: 45%

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:
2.4 on 17 Jul

Primary Season:
May 09 - Sep 15

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 23 UTC

See hourly table below

Climatological Threat Potential
Threat
Avg Prob of Occurrence
Return Interval
Natl Rank
Any Tornado
0.005%
20462 yrs
N/A
F2+ Tornado
0.004%
25650 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
14
5
31
15
6
5
26
19
1981
12
6
16
7
1
1
14
11
1982
10
7
56
14
12
5
34
17
1983
25
10
89
17
6
5
37
23
1984
14
8
37
14
14
9
42
24
1985
19
5
43
11
6
4
31
12
1986
22
11
24
14
7
7
36
26
1987
12
7
57
14
11
7
34
17
1988
17
13
72
19
7
6
31
24
1989
15
6
35
13
7
6
29
18
1990
13
7
42
13
7
4
27
16
1991
32
13
142
21
14
5
60
25
1992
21
6
84
7
14
3
49
10
1993
34
12
55
18
7
5
48
24
1994
55
17
103
23
8
4
71
30
1995
37
15
116
18
7
5
51
25
1996
89
26
62
19
7
5
103
33
1997
56
16
84
16
13
3
82
21
1998
97
20
203
27
15
8
127
37
1999
42
14
153
23
7
6
56
32
2000
102
21
79
21
3
2
108
30
2001
74
28
152
31
19
8
112
45
2002
80
21
183
25
7
4
94
33
2003
103
31
89
25
3
3
109
36
2004
119
31
129
26
16
6
151
35
2005
77
24
202
23
3
3
83
33
2006
169
33
182
28
4
3
177
45
AVG
50
15
93
19
9
5
152
26


Violent Tornadoes
Date
F
Deaths
Injuries

Monthly Averages
Month
Hail
Wind
Torn
Total
Jan
0
0
0
0
Feb
0
1
0
1
Mar
1
2
0
3
Apr
4
4
0
8
May
10
12
2
24
Jun
10
17
2
29
Jul
13
31
2
47
Aug
6
17
1
25
Sep
3
7
0
10
Oct
2
2
0
5
Nov
0
0
0
0
Dec
0
0
0
0

Hourly Averages
UTC
Hail
Wind
Torn
Total
00
92
227
24
343
01
100
162
13
275
02
61
138
8
207
03
45
123
7
175
04
31
127
2
160
05
32
82
4
118
06
31
57
2
90
07
21
63
1
85
08
12
42
0
54
09
7
57
3
67
10
14
76
6
96
11
15
63
1
79
12
11
17
0
28
13
14
25
2
41
14
11
20
4
35
15
16
23
9
48
16
38
43
1
82
17
37
72
6
115
18
67
100
9
176
19
109
145
10
264
20
148
174
36
358
21
156
220
27
403
22
152
213
32
397
23
140
251
24
415

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