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Beaufort Wind Scale

The Beaufort Wind Scale was developed in 1805 by Sir Francis Beaufort to describe wind speed and its effects on land and sea. It classifies wind speeds into 12 categories from 0-12 based on observed conditions like wave height, foam coverage, tree movement, and structural damage. Higher categories above 10 represent very strong winds like storms and hurricanes with waves over 45 feet and visibility greatly reduced by air filled with foam and spray.

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343 views1 page

Beaufort Wind Scale

The Beaufort Wind Scale was developed in 1805 by Sir Francis Beaufort to describe wind speed and its effects on land and sea. It classifies wind speeds into 12 categories from 0-12 based on observed conditions like wave height, foam coverage, tree movement, and structural damage. Higher categories above 10 represent very strong winds like storms and hurricanes with waves over 45 feet and visibility greatly reduced by air filled with foam and spray.

Uploaded by

FadilRamadhanTanjung
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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12/22/2017 Beaufort Wind Scale

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

Back to The Online Tornado FAQ

SPC Home Page

http://www.spc.noaa.gov/faq/tornado/beaufort.html 1/1

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