Radar:       Or click here for map
Radar: Great Falls MT
47.45 N - 111.38W
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
1082
62 14
Wind
737
84 12
Tornadoes
89
10 2
Total
1908
156 21
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
1:684
Sig Severe
N/A
1:8,360
Tornadoes
N/A
1:14,654
F2+ Torn
N/A
1:130,424
* 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: 1238%
10 year report increase: 30%
5 year report increase: -40%

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:
1.2 on 01 Jul

Primary Season:
May 17 - Sep 07

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:
17% at 23 UTC

See hourly table below

Climatological Threat Potential
Threat
Avg Prob of Occurrence
Return Interval
Natl Rank
Any Tornado
0.000%
N/A
N/A
F2+ Tornado
0.000%
N/A
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
5
5
12
9
4
3
13
13
1981
5
5
6
5
3
2
11
11
1982
21
7
10
6
3
2
27
11
1983
10
6
19
9
1
1
12
12
1984
4
4
19
8
0
0
4
9
1985
9
5
3
2
0
0
9
6
1986
3
2
3
3
2
2
7
6
1987
8
6
3
3
0
0
8
9
1988
24
11
25
14
7
3
38
22
1989
11
8
41
20
1
1
13
24
1990
14
9
12
6
1
1
16
11
1991
28
16
8
6
3
3
34
21
1992
22
9
8
7
5
5
32
16
1993
31
16
29
14
8
6
47
26
1994
19
11
34
20
7
4
33
26
1995
71
25
36
17
2
2
75
34
1996
56
17
23
14
3
3
62
25
1997
62
25
20
9
6
5
74
30
1998
50
17
40
16
6
4
62
25
1999
50
15
27
10
11
8
72
20
2000
110
22
35
17
2
2
114
32
2001
122
24
57
19
0
0
122
32
2002
81
25
82
21
6
3
93
30
2003
72
20
57
17
2
2
76
29
2004
69
22
57
15
1
1
71
29
2005
67
19
23
16
4
3
75
27
2006
58
15
48
20
1
1
60
29
AVG
40
14
27
12
3
2
71
21


Violent Tornadoes
Date
F
Deaths
Injuries

Monthly Averages
Month
Hail
Wind
Torn
Total
Jan
0
0
0
0
Feb
0
0
0
0
Mar
0
0
0
0
Apr
0
1
0
1
May
2
3
0
5
Jun
14
8
1
23
Jul
14
9
1
24
Aug
9
5
1
14
Sep
1
2
0
3
Oct
0
0
0
0
Nov
0
0
0
0
Dec
0
0
0
0

Hourly Averages
UTC
Hail
Wind
Torn
Total
00
151
125
10
286
01
159
81
8
248
02
95
96
7
198
03
88
58
9
155
04
50
37
2
89
05
24
14
0
38
06
21
7
1
29
07
9
8
1
18
08
4
2
0
6
09
9
5
0
14
10
3
2
0
5
11
6
5
0
11
12
1
0
0
1
13
1
2
0
3
14
6
0
0
6
15
2
1
0
3
16
3
2
0
5
17
5
2
2
9
18
8
2
1
11
19
19
7
2
28
20
50
21
6
77
21
89
45
11
145
22
109
91
7
207
23
170
124
22
316

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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