关键词: 河西东部, 沙尘暴, 预报方法

Abstract: Based on the meteorological data of the representative stations from 1951 to 2000, this paper analyzed the meteorological causes of sand-dust storm frequently occurring in east of Hexi Corridor, a region of more sand-dust storms in China. A system of forecasting and warning sand-dust storms for long-term, middle-term, short-term and even shorter than 6 hours has been put forward by using the daily weather data of the past 20 years and combing with the typical sand-dust storm examples of almost 50 years. Research results show that yearly forecast has relation to temperature, precipitation and gale days from winter to spring; monthly forecast depends on the numerical forecast products in China and overseas; daily forecast relates to weather circulation conditions, differential indexes; within 6 hours now-forecast relates to the gale circulation in upper air, and the weather of gale and sand-dust storm in upwind region.

Key words: east of Hexi corridor, sand-dust storm, forecasting methods