【摘要】 针对１９９８ 年４ 月１８ ～２１ 日出现在中国西北地区的一次强沙尘暴、浮尘天气过程，从天气事实、天气成因及动力诊断等方面进行了分析探讨。结果表明，西西伯利亚强冷空气迅速东移，在新疆西部上空形成强锋区，对应地面冷锋东移至前期增暖显著的新疆、内蒙古、甘肃、宁夏等地的沙漠、戈壁上，形成了大风、强沙尘暴、浮尘天气。该次强沙尘暴天气过程出现在基本稳定的大气层结中。更多还原

【Abstract】 Based on its fact,formation and dynamics diagnosis,a sandstorm and floating dust weather process occurred on 18～21 April 1998 in Northwest China is studied.The results show that cold air from west Siberian moves rapidly eastward and forms strong frontal zone over west XinJiang,which correponding surface cold front moves to such special underlying surface as desert,gobi in Xingjiang,lnner Mongolia,Gansu and Ningxia where has been heated before,and then results in the gale,strong sandstorm and floating dust weather.Moreover,the stratified atmosphere is stable,and the strongest sandstorm locat northly.更多还原