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BEAUFORT SCALE -- WIND EQUIVALENT

Beaufort
#

MPH

KTS

International
Description

Specifications

0

<1

<1

Calm Calm; smoke rises vertically

1

1-3

1-3

Light Air Direction of wind shown by smoke drift not by wind vanes

2

4-7

4-6

Light Breeze Wind felt on face; leaves rustle; vanes moved by wind

3

8-12

7-10

Gentle Breeze Leaves and small twigs in constant motion; wind extends light flag

4

13-18

11-16

Moderate Raises dust, loose paper; small branches moved

5

19-24 17-21 Fresh Small trees in leaf begin to sway; crested wavelets form on inland waters

6

25-31 22-27 Strong Large branches in motion; whistling heard in telegraph wires; umbrellas used with difficulty

7

32-38 28-33 Near Gale Whole trees in motion; inconvenience felt walking against the wind

8

39-46 34-40 Gale Breaks twigs off trees; impedes progress

9

47-54 41-47 Strong Gale Slight structural damage occurs

10

55-63 48-55 Storm Trees uprooted; considerable damage occurs

11

64-72 56-63 Violent Storm Widespread damage

12

73-82 64-71 Hurricane