風速

Beaufort number

Description

Sea conditions

Land conditions

風速

Kilometres per hour (min)

Kilometres per hour (max)

Metre per second (min)

Metre per second (max)

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Amount of substance

Absorbed dose

Calm

Light air

Light breeze

Gentle breeze

Moderate breeze

Fresh breeze

Strong breeze

High wind

Gale

Strong gale

Storm

Violent storm

Hurricane force

Flat.

Ripples without crests.

Small wavelets. Crests of glassy appearance, not breaking

Large wavelets. Crests begin to break; scattered whitecaps

Small waves with breaking crests. Fairly frequent white horses.

Moderate waves of some length. Many white horses. Small amounts of spray.

Long waves begin to form. White foam crests are very frequent. Some airborne spray is present.

Sea heaps up. Some foam from breaking waves is blown into streaks along wind direction. Moderate amounts of airborne spray.

Moderately high waves with breaking crests forming spindrift. Well-marked streaks of foam are blown along wind direction. Considerable airborne spray.

High waves whose crests sometimes roll over. Dense foam is blown along wind direction. Large amounts of airborne spray may begin to reduce visibility.

Very high waves with overhanging crests. Large patches of foam from wave crests give the sea a white appearance. Considerable tumbling of waves with heavy impact. Large amounts of airborne spray reduce visibility.

Exceptionally high waves. Very large patches of foam, driven before the wind, cover much of the sea surface. Very large amounts of airborne spray severely reduce visibility.

Huge waves. Sea is completely white with foam and spray. Air is filled with driving spray, greatly reducing visibility.

Calm. Smoke rises vertically.

Smoke drift indicates wind direction, still wind vanes.

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語言

風速

風速

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