兰州市冬季天气气候变化及降雪形势分析

The Climate Change and Snowfall Situation Analysis in Winter of Lanzhou

利用兰州市1951～2000年冬季(11、12～2月)逐日降雪、气温资料及1990～2000年历年(11、12～2月)的500、700hPa高空环流形势图、地面形势图,分析了兰州市冬季气温、降水变化趋势及24个降雪个例。从而对兰州市降雪天气的形势背景、发生、发展特点有了一定的了解,建立起了较为清晰的预报思路、预报模型、预报个例库。

Using the daily snowfall ,temperature data during 1995～2000 (in November, December, January, February) and 500,700hPa circulation situation pictures of high altitude and ground in 1990～2000( in November, December,January, February), the paper analyzed the temperature, precipitation variation tendency and 24 snowfall examples in winter of the past 50 years,demonstrated the weather situation background for snowfall and its occurring,developing as well, and set up the clearer forecast mentality, forecast model and forecast example storehouse.