Radar:       Or click here for map
Radar: Washington (Sterling) VA
38.97 N - 77.47W
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
2654
102 24
Wind
9353
239 48
Tornadoes
717
113 11
Total
12724
454 54
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
53
1:103
Sig Severe
68
1:2,873
Tornadoes
64
1:1,819
F2+ Torn
52
1:11,542
* 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: 378%
10 year report increase: 11%
5 year report increase: 29%

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:
5.1 on 08 Jul

Primary Season:
Apr 20 - Sep 02

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 22 UTC

See hourly table below

Climatological Threat Potential
Threat
Avg Prob of Occurrence
Return Interval
Natl Rank
Any Tornado
0.011%
9251 yrs
72
F2+ Tornado
0.007%
15362 yrs
74
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
38
19
130
44
19
14
76
52
1981
16
11
35
19
9
7
34
29
1982
11
8
89
29
4
3
19
32
1983
30
15
226
37
14
7
58
42
1984
17
8
73
22
16
5
49
28
1985
52
13
77
22
9
6
70
25
1986
25
12
135
33
6
4
37
38
1987
25
15
89
32
6
6
37
40
1988
57
22
171
38
10
9
77
47
1989
30
14
317
44
25
13
80
50
1990
78
21
359
51
31
13
140
56
1991
64
19
381
51
17
7
98
51
1992
44
24
386
50
38
11
120
54
1993
118
28
324
55
39
12
196
61
1994
112
36
434
74
50
14
212
79
1995
92
29
525
66
40
21
172
71
1996
135
32
531
65
49
15
233
70
1997
63
15
260
42
18
7
99
46
1998
212
35
432
50
50
19
312
63
1999
148
31
513
52
14
11
176
58
2000
307
42
504
62
21
14
349
69
2001
114
31
477
51
26
12
166
58
2002
230
36
668
57
20
9
270
61
2003
140
41
698
63
36
17
212
70
2004
157
33
580
63
111
21
379
72
2005
106
25
395
60
22
6
150
64
2006
233
38
544
64
17
10
267
74
AVG
98
24
346
48
27
11
471
54


Violent Tornadoes
Date
F
Deaths
Injuries
1993 06-Aug 1730 UTC
F4
4
246
1998 03-Jun 0102 UTC
F4
0
5
2001 24-Sep 1903 UTC
F4
0
2
2002 28-Apr 2256 UTC
F4
3
122

Monthly Averages
Month
Hail
Wind
Torn
Total
Jan
0
5
0
6
Feb
0
2
0
2
Mar
2
7
0
10
Apr
16
19
2
37
May
25
54
4
82
Jun
21
76
4
101
Jul
19
92
6
117
Aug
10
54
3
67
Sep
3
16
4
24
Oct
0
6
1
8
Nov
1
14
1
16
Dec
0
1
0
1

Hourly Averages
UTC
Hail
Wind
Torn
Total
00
225
1002
79
1306
01
142
630
43
815
02
85
456
33
574
03
38
280
16
334
04
23
163
5
191
05
16
123
12
151
06
9
76
5
90
07
9
47
4
60
08
5
28
6
39
09
5
22
4
31
10
6
24
8
38
11
4
40
5
49
12
4
58
7
69
13
9
37
5
51
14
3
74
4
81
15
18
80
7
105
16
17
99
11
127
17
42
147
16
205
18
108
286
37
431
19
270
615
52
937
20
406
1051
88
1545
21
435
1344
82
1861
22
399
1453
101
1953
23
376
1218
87
1681

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