Beaufort Scale of Wind  蒲福风级表

Beaufort Scale  Description  Wind speed(knot)

0         Calm 无风                     <0     Sea like a mirror1        light air 软风                  1-2Ripples but without foam crests2       Light breeze 轻风           3-6Small wavelets. Crests do not break3       Gentle breeze 微风        7-10Large wavelets. Perhaps scattered white horses4    Moderate breeze  和风      11-15Small waves. Fairly frequent white horses5    Fresh breeze 清风            16-20Moderate waves, many white horses6    Strong breeze 强风          21-26     Large waves begin to form; white foam crests,probably spray                                                                7    Near gale   疾风              27-33Sea heaps up and white foam blown in streaksalong the direction of the wind8      Gale 大风                     34-40Moderately high waves, crests begin to break into spindrift 9      Strong gale  烈风          41-47High waves. Dense foam along the direction ofthe wind. Crests of waves begin to roll over. Spray may affect visibility10       Storm  狂风               48-55Very high waves with long overhanging crests. The surface of the seatakes a white appearance. The tumbling of the sea becomes heavy and shocklike. Visibility affected11     Violent storm  暴风      56-63Exceptionally high waves. The seais completelycovered with long white patches of foam lying inthe direction of the wind. Visibility affected12    Hurricane  飓风              ≥64The air is filled with foam and spray. Sea completely white with driving spray. Visibility very seriously affected

蒲福风级（Beaufort scale）是国际通用的风力等级，由英国人弗朗西斯·蒲福（Francis Beaufort）于1805年拟定，用以表示风强度等级。风力等级简称风级，是风强度（风力）的一种表示方法，故又称“蒲福风力等级表”。它最初是根据风对地面物体或海面的影响大小分为0—12级， 共13个等级。 自1946年以来，风力等级又作了扩充，增加到18个等级（0—17级）。蒲福风级表最开始时只运用于海上，经改良后也可用于陆地。1947年第12届国际气象台长会议上被正式承认。

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