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 |
