Dwyer Mark II WSI - Manual (Page 3)

Bulletin H-89
Beaufort
Number
0
1
2
3
4
5
6
Miles
per
Hour
Less
than 1
1-3
4-7
8-12
13-18
19-24
25-31
Knots
Less
than 1
1-3
4-6
7-10
11-16
17-21
22-27
Descriptive Term
Calm
Light Air
Light Breeze
Gentle Breeze
Moderate
Fresh
Strong
Beaufort
Number
7
8
9
10
11
12 or
more
Miles
per
Hour
32-38
39-46
47-54
55-63
64-72
73 or
more
Knots
28-33
34-40
41-47
48-55
56-63
64 or
more
Descriptive Term
Near Gale
Gale
Strong Gale
Storm
Violent Storm
Hurricane
35
30
25
20
15
10
5
0
-5
-10
-15
-20
5
33
27
21
16
12
7
1
-6
-11
-15
-20
-26
10
21
16
9
2
-2
-9
-15
-22
-27
-31
-38
-45
15
16
11
1
-6
-11
-18
-25
-33
-40
-45
-51
-60
20
12
3
-4
-9
-17
-24
-32
-40
-46
-52
-60
-68
25
7
0
-7
-15
-22
-29
-37
-45
-52
-58
-67
-75
30
5
-2
-11
-18
-26
-33
-41
-49
-56
-63
-70
-78
35
3
-4
-13
-20
-27
-35
-43
-52
-60
-67
-72
-83
40
1
-5
-15
-22
-29
-36
-45
-54
-62
-69
-76
-87
WIND CHILL EFFECT
Wind Speed
M.P.H.
BEAUFORT SCALE OF WIND FORCE
T
emperatur
e °F
Wind Chill Temperature
Extreme danger of frostbite to exposed flesh exists at wind
chill temperatures below -22° F.
page 3