5 |
Knots |
= |
5.8 |
MPH |
10 |
Knots |
= |
11.5 |
MPH |
15 |
Knots |
= |
17.3 |
MPH |
20 |
Knots |
= |
23.0 |
MPH |
25 |
Knots |
= |
28.8 |
MPH |
30 |
Knots |
= |
34.6 |
MPH |
35 |
Knots |
= |
40.3 |
MPH |
40 |
Knots |
= |
46.1 |
MPH |
45 |
Knots |
= |
51.8 |
MPH |
50 |
Knots |
= |
57.6 |
MPH |
55 |
Knots |
= |
63.4 |
MPH |
60 |
Knots |
= |
69.1 |
MPH |
65 |
Knots |
= |
74.9 |
MPH |
70 |
Knots |
= |
80.6 |
MPH |
75 |
Knots |
= |
86.4 |
MPH |
80 |
Knots |
= |
92.2 |
MPH |
85 |
Knots |
= |
97.9 |
MPH |
90 |
Knots |
= |
103.7 |
MPH |
95 |
Knots |
= |
109.4 |
MPH |
100 |
Knots |
= |
115.2 |
MPH |
105 |
Knots |
= |
121.0 |
MPH |
110 |
Knots |
= |
126.7 |
MPH |
115 |
Knots |
= |
132.5 |
MPH |
120 |
Knots |
= |
138.2 |
MPH |
125 |
Knots |
= |
144.0 |
MPH |
130 |
Knots |
= |
149.8 |
MPH |
135 |
Knots |
= |
155.5 |
MPH |
140 |
Knots |
= |
161.3 |
MPH |
145 |
Knots |
= |
167.0 |
MPH |
150 |
Knots |
= |
172.8 |
MPH |
|
|
Windspeed |
in MPH Description Visible Condition |
| 0 | Calm Smoke rises vertically |
| 1 - 4 | Light Air Direction of wind shown by smoke but not by wind vanes |
| 4 - 7 | Light Breeze Wind felt on face; leaves rustle; ordinary wind vane moved by wind |
| 8 - 12 | Gentle Breeze Leaves and small twigs in constant motion; wind extends light flag |
| 13 - 18 | Moderate Breeze Raises dust and loose paper; small branches are moved |
| 19 - 24 | Fresh Breeze Small trees in leaf begin to sway; crested wavelets form on inland water |
| 25 - 31 | Strong Breeze Large branches in motion; telephone wires whistle; umbrellas used with difficulty |
| 32 - 38 | Moderate Gale Whole trees in motion; inconvenience in walking against wind |
| 39 - 46 | Fresh Gale Breaks twigs off trees; generally impedes progress |
| 47 - 54 | Strong Gale Slight structural damage occurs; chimney pots and slates removed |
| 55 - 63 | Whole Gale Trees uprooted; considerable structural damage occurs |
| 64 - 72 | Storm Very rarely experienced; accompanied by widespread damage |
| 73+ | Hurricane Devastation occurs |
| 74 - 95 | CAT 1 Minimal |
| 96 - 110 | CAT 2 Moderate |
| 111 - 130 | CAT 3 Extensive |
| 131 - 155 | CAT 4 Extreme |
| > 155 | CAT 5 Catastophic |