Research On Statistics And Analysis Of North Pacific Extratropical Cyclones

North pacific extratropical cyclone is an important weather system severely threatening the ships sailing on high latitude routes. Extratropical cyclone is often accompanied by hash weather such as storm, torrential rain, very rough waves and low visibility and with the wide affected area and long duration the extent to which it affects the ships in routes is not less than typhoon. The present numerical weather forecast time limit can not meet the demand of choosing interocean routes. Therefore, the material of extratropical cyclone weather and climate are very important to choosing interocean routes. The characteristics of North pacific extratropical cyclone weather and climate is the main weather and climate background which navigators take into account when they choose routes on North Pacific especially in winter. Meanwhile, familiar with the characteristics of North Pacific extratropical cyclone weather and climate, navigators can better understand and operate the received short or medium numerical weather forecast fax weather chart by ships to route automatically; being familiar with the characteristics of North Pacific extratropical cyclone weather and climate is helpful to understand and properly apply the recommended routes by weather routing companies. Hereby the further research on North Pacific extratropical cyclone weather and their moving regulation is of importance and meaningfulness.On the basis of precedent research, this article categorizes and researches statistically on extratropical cyclone at East Asia and North Pacific from 1987 to 19%, and summarizes North Pacific extratropical cyclone's frequency, intensity, origin, development and moving path, gale distribution, and frequency of North Pacific extratropical cyclone explosive development, frequency of explosive extratropical cyclone, intensity, origin, development and moving path, average ground distribution of extratropical cyclone explosive development. On the basis of this statistics and analysis, it is compared with other main North Pacific extratropical cyclone statistic material. The statistic features of this article is: the material is later; statistic analysis is morecomprehensive, detail and aimed, more practical, better serves navigation ; the statistic result almost coincides with the other statistic material but there is a little deference. Finally by the statistic result, the article discusses interocean routing on North Pacific and the solution to explosive extratropical cyclone under the circumstance of ships. In the background of statistic features of North Pacific extratropical cyclone weather and climate, the article objectively analyzes the safe high latitude routing on North Pacific in cold half year and has some practical value. At last in the background of North Pacific explosive extratropical cyclone weather and climate characteristics, the practical solutions to explosive extratropical cyclone under the circumstance of ships are presented.