Storm and Hurricane
The Beaufort scale is an empirical measure that relates wind speed to observed conditions at sea or on land. Its full name is the Beaufort winds force scale, although it is a measure of wind speed and not of force in the scientific sense. The scale was devised in 1805 by Francis Beaufort (later Rear Admiral Sir Francis Beaufort), an Irish Royal Navy officer.
Effects Land / Sea
Slight damage occurs to buildings, shingles are blown off of roofs. High waves (6 meters), rolling seas, dense foam, Blowing spray reduces visibility.
Trees are broken or uprooted, building damage is considerable.
Large waves (6-9 meters), overhanging crests, sea becomes white with foam, heavy rolling, reduced visibility.
Extensive widespread damage.
Large waves (9-14 meters), white foam, visibility further reduced.
Extreme destruction, devastation.
Large waves over 14 meters, air filled with foam, sea white with foam and driving spray, little visibility.
Km/h
118+
103-117
89-102
75-88
Wind speed
Knots
64+
56-63
48-55
41-47
Mp/h
73+
64-72
55-63
47-54
Beaufort
number of force
9
10
11
12
Wind and storm - Beaufort scale
Motivation articles
Description
Strong Gail
Whole Gail or Storm
Violent Storm
Hurricane