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Beaufort Wind Scale

 

Number

Name

mph

kph

Effects

0

Calm

0-1

0-1

Calm; smoke rises vertically.

1

Light Air

1-3

1-5

Weathervanes inactive; smoke drifts.

2

Light Breeze

4-7

6-11

Weatervanes active; leaves rustle, wind felt.

3

Gentle Breeze

8-12

12-19

Leaves and small twigs move; light flags extend.

4

Moderate Breeze

13-18

20-28

Small branches sway; dust and paper blow.

5

Fresh Breeze

19-24

29-38

Small trees sway; waves break on inland waters.

6

Strong Breeze

25-31

39-49

Large branches sway; umbrellas hard to use.

7

Moderate Gale

32-38

50-61

Whole trees sway; hard to walk against wind.

8

Fresh Gale

39-46

62-74

Twigs break off trees; very difficult to walk against wind.

9

Strong Gale

47-54

75-88

Slight damage to buildings; shingles blow off.

10

Whole Gale

55-63

89-102

Trees uprooted; significant damage to buildings.

11

Storm

64-73

103-117

Widespread damage.

12-17

Hurricane

74 +

117 +

Violent destruction.

 


This page last modified on 4 December 2008 04:20:02 PM (active 605 days)

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