Radar:       Or click here for map
Radar: Riverton WY
43.05 N - 108.47W
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
383
12 7
Wind
351
39 9
Tornadoes
90
6 3
Total
824
57 16
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
1:1,583
Sig Severe
N/A
1:22,881
Tornadoes
N/A
1:14,492
F2+ Torn
N/A
1:217,373
* 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: 74%
10 year report increase: 236%
5 year report increase: -41%

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:
0.5 on 13 Jun

Primary Season:
May 11 - Sep 16

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:
15% at 00 UTC

See hourly table below

Climatological Threat Potential
Threat
Avg Prob of Occurrence
Return Interval
Natl Rank
Any Tornado
0.003%
32679 yrs
N/A
F2+ Tornado
0.003%
36363 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
2
2
10
9
3
3
8
13
1981
3
3
8
8
1
1
5
11
1982
9
7
11
8
7
3
23
13
1983
5
4
14
9
0
0
5
13
1984
12
5
7
7
6
5
24
15
1985
0
0
9
6
2
2
4
8
1986
5
4
19
14
3
3
11
17
1987
8
6
19
10
6
5
20
18
1988
2
2
14
9
4
2
10
12
1989
7
5
18
11
4
3
15
18
1990
3
3
17
12
4
4
11
17
1991
14
8
3
3
6
4
26
14
1992
4
3
18
15
2
2
8
20
1993
14
11
8
7
1
1
16
18
1994
11
7
16
13
0
0
11
19
1995
5
3
22
11
3
2
11
13
1996
5
4
9
5
0
0
5
8
1997
23
14
4
4
13
8
49
21
1998
24
13
16
11
3
3
30
22
1999
20
11
9
6
7
6
34
16
2000
24
10
9
8
1
1
26
16
2001
41
19
31
13
7
5
55
25
2002
38
11
18
8
0
0
38
17
2003
26
9
5
5
2
2
30
12
2004
29
16
5
5
1
1
31
21
2005
21
14
14
9
3
1
27
20
2006
28
8
18
9
1
1
30
16
AVG
14
7
13
9
3
3
31
16


Violent Tornadoes
Date
F
Deaths
Injuries
1987 21-Jul 2050 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
0
0
0
1
May
2
1
1
4
Jun
5
3
1
10
Jul
4
4
1
8
Aug
2
3
0
5
Sep
1
1
0
2
Oct
0
0
0
0
Nov
0
0
0
0
Dec
0
0
0
0

Hourly Averages
UTC
Hail
Wind
Torn
Total
00
54
58
13
125
01
34
49
8
91
02
28
28
4
60
03
17
21
0
38
04
6
6
1
13
05
5
4
0
9
06
2
2
0
4
07
2
7
0
9
08
2
1
0
3
09
1
1
0
2
10
0
2
0
2
11
1
2
0
3
12
0
0
1
1
13
1
1
0
2
14
0
0
0
0
15
0
0
0
0
16
6
0
0
6
17
4
3
2
9
18
7
4
4
15
19
26
3
6
35
20
34
23
15
72
21
49
45
13
107
22
52
46
12
110
23
52
45
11
108

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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