|
MPH
|
Description
|
Beaufort Effects
|
Beaver Effects
|
|
0-1
|
Calm
|
Smoke rises straight
up; water like mirror
|
|
|
1-3
|
Light air
|
Smoke drifts
slowly; ripples on water
|
|
|
4-7
|
Slight breeze
|
Leaves rustle;
small wavelets
|
|
|
8-12
|
Gentle breeze
|
Leaves and twigs
in motion; large wavelets, scattered whitecaps up to 1½ feet tall
|
|
|
13-18
|
Moderate breeze
|
Small branches
move; loose paper blows; small waves 2 to 4 feet tall
|
|
|
19-24
|
Fresh breeze
|
Small trees sway;
many whitecaps 4-8 feet tall; some spray
|
|
|
25-31
|
Strong breeze
|
Large branches
sway; telephone wires whistle; whitecaps everywhere with waves 8-13
feet tall
|
|
|
32-38
|
Near gale
|
Whole trees in
motion; becomes hard to walk against wind; waves 13 feet tall; foam
from waves begins to blow
|
|
|
39-46
|
Gale
|
Twigs break off
trees; waves up to 16 feet tall
|
|
|
47-54
|
Strong gale
|
Branches break;
minor damage to houses; high, rolling waves up to 21 feet; damage
to beaches
|
|
|
55-63
|
Whole gale
|
Trees blown over;
overhanging crests on waves up to 26 feet tall; sea is white
|
|
|
64-73
|
Storm
|
Widespread damage;
exceptionally high waves up to 35 feet tall
|
|
|
74-up
|
Hurricane
|
Widespread damage;
air filled with foam; large ships sink
|
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