Land: paper and leaves are scattered. Wind speed: 8— Wave height: 2—3 m 6—10 ft. Sea: moderate waves taking longer form, many whitecaps, some spray. Land: small trees sway, whitecaps form on waves. Wind speed: Wave height: 3—4 m 9—13 ft. Sea: larger waves, whitecaps common, more spray. Land: Umbrellas are hard to use, large branches on trees move. Wave height: 4—5. Sea: sea heaps up, large waves, white foam streaks off breakers.
Land: Trees sway, walking in the wind is difficult. Wave height: 5. Sea: moderately high waves, edges of crests begin to break into spindrift. Land: Twigs and branches break off of trees. Wave height: 7—10 m 23—32 ft. Sea: high waves, crests roll over. Foam is blown along the wind direction. Large amounts of spray may reduce visibility. Land: roof tiles blow off buildings. Wave height: 9— Sea: very high waves with overhanging crests.
White appearance in the sea. Large amounts of airborne spray. Land: trees are uprooted. Wave height: Sea: exceptionally high waves that can hide small and medium ships to view. Water covered with long white patches of foam. Land: widespread damage to vegetation and buildings, nearly no visibility at sea.
Sea: completely white with driving spray; visibility very seriously affected. Land: widespread destruction. As the scale is based on visual and subjective observation, in different countries people still alter it to make it more useful for their particular region and specific weather conditions. For example:. Flag waves. Paper and leaves are scattered. Fresh breeze at kph mph. Small trees sway, whitecaps form on waves.
Strong breeze at kph mph. Umbrellas are hard to use, large branches on trees move. Moderate gale at kph mph. Trees sway, walking in the wind is difficult. Fresh gale at kph mph. Twigs and branches break off of trees. Strong gale at kph mph. Roof tiles blow off buildings. Whole gale at kph mph. Trees are uprooted. Storm at kph mph. Hurricane at kph mph. The Beaufort scale describes the force of winds. Photograph by Otis Imboden. Beaufort scale. Royal Navy. Sir Francis Beaufort. Media Credits The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit.
Last Updated Jan. Media If a media asset is downloadable, a download button appears in the corner of the media viewer. Text Text on this page is printable and can be used according to our Terms of Service. Interactives Any interactives on this page can only be played while you are visiting our website. Related Resources. Environmental Hazards.
View Collection. View Article. MapMaker: Major Hurricane Tracks. It is based on observation rather than accurate measurement. It is the most widely used system to measure wind speed today. Can you drive in 40 mph winds? Refrain from any unnecessary driving during this time since these winds will make driving very difficult, especially for high profile vehicles.
What wind speed stops ferries? Re: Too windy for the ferries? What force is 50 mph wind? What wind speed creates Whitecaps? White caps begin to appear at knots, and are more frequent in 15 knots.
Is 15 mph winds strong? How Strong is 55 mph Wind?
0コメント