7
51-61
32-38
Strong
Whole trees in motion;
Inconvenience felt while
walking against the wind.
At sea, 13-20ft 4-6m waves.
8
62-74
39-46
Gale
Breaks twigs off trees;
generally impedes progress.
9
75-87
47-54
Gale
Slight structural damage,
roofing dislodged, large
branches break off. High waves
(20ft/6m), reduced visibility at
sea. Protect wind gauge.
10
11
88-101
55-63
Storm
Seldom experienced inland;
accompanied by widespread
damage. Exceptionally high
waves 30-45ft (9-14m).
102-116
64-72
Storm
Very rarely experienced inland;
accompanied by widespread
damage. Exceptionally high
waves 30-45ft (9-14m).
12
117 or more
73 or more
Hurricane
Very rarely experienced;
accompanied by widespread
damage. At sea, waves over
45/14m, visibility greatly
reduced.
24
WIND SPEED DISPLAY
Beaufort Force Wind Speed
(KmPH)
Wind Speed
(MPH)
Terms used
in forecasts
Indicators