Figure 11. Beam centerline height for various ranges as a function of elevation angle assuming standard refractive conditions. These curves are derived from the WSR-88D Beam Height Equation, Equation 12.

BELOW: Table used in the creation of Fig. 11. Beam center heights (in kft) for selected elevation angles and ranges, up to 80,000 ft.

Range
Elevation
Angle (°)
10 nm
(18.5 km)
20 nm
(37 km)
30 nm
(55.5 km)
40 nm
(74.1 km)
50 nm
(92.7 km)
60 nm
(111.2 km)
70 nm
(129.7 km)
80 nm
(148.3 km)
90 nm
(166.8 km)
100 nm
(185.3 km)
110 nm
(203.9 km)
120 nm
(222.4 km)
0.0
0.066
0.027
0.60
1.06
1.67
2.39
3.25
4.24
5.37
6.63
8.02
9.54
0.5
0.600
1.33
2.19
3.18
4.31
5.57
6.96
8.48
10.1
11.9
13.9
15.9
1.0
1.13
2.39
3.78
5.30
6.96
8.75
10.7
12.7
14.9
17.2
19.7
22.3
1.5
1.66
3.45
5.37
7.42
9.6
11.9
14.4
17.0
19.7
22.5
25.5
28.6
2.0
2.19
4.51
6.96
9.54
12.3
15.1
18.1
21.2
24.4
27.8
31.3
35.0
2.5
2.72
5.57
8.55
11.7
14.9
18.3
21.8
25.4
29.2
33.1
37.2
41.3
3.0
3.25
6.62
10.1
13.8
17.6
21.5
25.5
29.7
34.0
38.4
43.0
47.7
3.5
3.78
7.68
11.7
15.9
20.2
24.6
29.2
33.9
38.7
43.7
48.8
54.0
4.0
4.3
8.74
13.3
18.0
22.8
27.8
32.9
38.1
43.5
49.0
54.6
60.4
4.5
4.8
9.8
14.9
20.1
25.5
31.0
36.6
42.4
48.2
54.3
60.4
66.7
5.0
5.36
10.9
16.5
22.2
28.1
34.1
40.3
46.6
53.0
59.5
66.2
73.0
6
6.42
13.0
19.6
26.5
33.4
40.5
47.7
55.0
62.5
70.1
7
7.47
15.1
22.8
30.7
38.7
46.8
55.0
63.4
71.9
8
8.52
17.2
26.0
34.9
43.9
53.1
62.4
71.8
9
9.57
19.3
29.1
39.1
49.1
59.4
69.7
80.2
10
10.6
21.4
32.2
43.2
54.4
65.6
77.0
12
12.7
25.5
38.5
51.5
64.7
78.1
14
14.8
29.6
44.7
59.8
75.1
16
16.8
33.7
50.8
68.0
18
18.8
37.8
56.9
76.1
20
20.8
41.8
62.9
24
24.8
49.6
74.6
30
30.4
61.0