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Beaufort Wind Scale

The Beaufort Wind Scale was developed in 1805 by Sir Francis Beaufort to classify wind speeds based on observed conditions at sea and on land. It ranges from Force 0 for calm conditions up to Force 12 for a hurricane. The scale describes the appearance of wind effects on the water such as wave height and whitecaps, as well as effects on land like movement of trees, flags, and structural damage.

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195 views2 pages

Beaufort Wind Scale

The Beaufort Wind Scale was developed in 1805 by Sir Francis Beaufort to classify wind speeds based on observed conditions at sea and on land. It ranges from Force 0 for calm conditions up to Force 12 for a hurricane. The scale describes the appearance of wind effects on the water such as wave height and whitecaps, as well as effects on land like movement of trees, flags, and structural damage.

Uploaded by

Batak Legends
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Beaufort Wind Scale

Developed in 1805 by Sir Francis Beaufort, U.K. Royal Navy

Wind WMO Appearance of Wind Effects


Force (Knots) Classification On the Water On Land
Less
0 Calm Sea surface smooth and mirror-like Calm, smoke rises vertically
than 1
Smoke drift indicates wind direction, still
1 1-3 Light Air Scaly ripples, no foam crests
wind vanes
Wind felt on face, leaves rustle, vanes
2 4-6 Light Breeze Small wavelets, crests glassy, no breaking
begin to move
Large wavelets, crests begin to break, scattered Leaves and small twigs constantly
3 7-10 Gentle Breeze
whitecaps moving, light flags extended
Moderate Small waves 1-4 ft. becoming longer, numerous Dust, leaves, and loose paper lifted, small
4 11-16
Breeze whitecaps tree branches move
Moderate waves 4-8 ft taking longer form, many
5 17-21 Fresh Breeze Small trees in leaf begin to sway
whitecaps, some spray
Larger tree branches moving, whistling in
6 22-27 Strong Breeze Larger waves 8-13 ft, whitecaps common, more spray
wires
Sea heaps up, waves 13-19 ft, white foam streaks off Whole trees moving, resistance felt
7 28-33 Near Gale
breakers walking against wind
Moderately high (18-25 ft) waves of greater length,
Twigs breaking off trees, generally
8 34-40 Gale edges of crests begin to break into spindrift, foam
impedes progress
blown in streaks
High waves (23-32 ft), sea begins to roll, dense streaks Slight structural damage occurs, slate
9 41-47 Strong Gale
of foam, spray may reduce visibility blows off roofs
Very high waves (29-41 ft) with overhanging crests, sea Seldom experienced on land, trees broken
10 48-55 Storm white with densely blown foam, heavy rolling, lowered or uprooted, "considerable structural
visibility damage"
Exceptionally high (37-52 ft) waves, foam patches
11 56-63 Violent Storm
cover sea, visibility more reduced
Air filled with foam, waves over 45 ft, sea completely
12 64+ Hurricane
white with driving spray, visibility greatly reduced

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