Classification of Tropical Cyclones
熱帶氣旋之分級
Grade
級別
One-Minute Mean Wind Speed at Ten Metres above Sea
海面上十公尺之一分鐘平均風速
Force
風級
m/s
公尺/秒
knot
海浬/時
mph
英哩/時
km/h
公里/時
Tropical Depression
熱帶低氣壓
6-710.8-17.122-3325-3839-61
Tropical Storma
熱帶風暴a
8-917.2-24.434-4739-5462-88
Severe Tropical Stormb
強烈熱帶風暴b
10-1124.5-32.648-6355-7289-117
Typhoon/Hurricane
颱風/颶風
12+32.7+64+73+118+
a, b: Adopted by the Hong Kong Observatory and the Japan Meteorological Agency
a,b:香港天文及日本氣象廳台採用
In the rest of the world these two grades are often combined as "Tropical Storm"
世界各地多合併此兩級為「熱帶風暴」
The Saffir-Simpson Scale of Typhoons/Hurricanes
Saffir-Simpson之颱風/颶風分級法
Category 1 一級
Minimal 輕度
980mb+
12-1432.7-42.764-8373-95118-153
Category 2 二級
Moderate 中度
965-980mb
14-1542.8-49.384-9696-110154-177
Category 3 三級
Extensive 廣泛
945-964mb
15-1749.4-58.197-113111-130178-209
Category 4 四級
Extreme 極度
920-944mb
17+58.2-69.4114-135131-155210-250
Category 5 五級
Catastrophic 災難性
920mb-
17+69.4+135+155+250+
A 130-knot+ typhoon is also known as a "Super Typhoon"
持續風速超過每小時130浬之颱風,亦稱為「超級颱風」