Making use of the year-book data of the typhoon between 1960-1994 we define the tropical cyclone entering the area north to 30 ° N and west to 125 ° E as the affecting-north tropical cyclone .

本文利用1960～1994年台风 年鉴资料，定义进入30°N以北、125°E以西的热带气旋为影响北方热带气旋。