Radar:       Or click here for map
Radar: Denver Boulder CO
39.78 N - 104.53W
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
6397
 472 49
Wind
1561
 192 29
Tornadoes
1220
 59 19
Total
9178
 723 64
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
70
1:142
Sig Severe
47
1:1,804
Tornadoes
18
1:1,069
F2+ Torn
N/A
1:22,106
* 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: 177%
10 year report increase: -31%
5 year report increase: -11%
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 06 Jun

Primary Season:
May 03 - Sep 05
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:
16% at 23 UTC
See hourly table below

Climatological Threat Potential
Threat
Avg Prob of Occurrence
Return Interval
Natl Rank
Any Tornado
0.007%
15278 yrs
N/A
F2+ Tornado
0.004%
27705 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
36
18
23
21
29
21
94
48
1981
64
25
44
28
26
14
116
48
1982
144
40
35
20
59
28
262
55
1983
168
36
49
23
33
16
234
50
1984
72
24
26
16
45
23
162
43
1985
93
29
34
21
26
18
145
46
1986
107
34
32
21
21
11
149
46
1987
146
39
19
16
44
19
234
52
1988
66
27
31
24
52
28
170
55
1989
104
38
30
23
17
10
138
55
1990
102
33
42
23
68
26
238
55
1991
239
52
42
24
84
24
407
61
1992
165
45
38
26
70
27
305
68
1993
243
52
78
44
72
25
387
72
1994
211
62
95
41
52
16
315
74
1995
166
45
53
29
41
20
248
64
1996
436
68
119
45
89
27
614
75
1997
260
69
56
35
56
27
372
82
1998
317
72
61
29
45
28
407
84
1999
352
58
63
35
44
19
440
69
2000
294
55
99
44
50
15
394
78
2001
359
69
102
38
39
15
437
82
2002
312
42
46
23
17
8
346
50
2003
338
71
68
32
31
15
400
78
2004
602
73
93
35
69
23
740
81
2005
666
79
88
39
28
15
722
91
2006
335
55
95
33
13
6
361
64
AVG
237
49
58
29
45
19
340
64


Violent Tornadoes
Date
F
Deaths
Injuries

Monthly Averages
Month
Hail
Wind
Torn
Total
Jan
0
0
0
0
Feb
0
0
0
0
Mar
1
0
0
2
Apr
11
2
1
14
May
40
9
8
57
Jun
82
15
18
115
Jul
51
18
10
79
Aug
38
10
5
53
Sep
12
3
1
16
Oct
2
1
1
4
Nov
0
0
0
0
Dec
0
0
0
0

Hourly Averages
UTC
Hail
Wind
Torn
Total
00
1040
252
180
1472
01
847
256
139
1242
02
644
148
106
898
03
412
119
67
598
04
217
71
25
313
05
145
31
15
191
06
44
13
10
67
07
35
11
3
49
08
23
12
0
35
09
12
4
0
16
10
6
1
0
7
11
7
0
0
7
12
6
2
0
8
13
7
1
1
9
14
7
4
1
12
15
9
3
0
12
16
6
0
5
11
17
19
1
11
31
18
36
14
16
66
19
105
29
39
173
20
269
60
96
425
21
604
122
146
872
22
841
166
181
1188
23
1056
241
179
1476

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