西北地区东部三次暴雨天气的螺旋度分析

利用T10 6数值预报模式 1°× 1°的标准等压面的格点资料 ,计算了K -螺旋度 ,对近年西北区东部的三次暴雨天气过程进行了螺旋度分析。结果表明 ,螺旋度的分布可以反映出高空天气系统的位置极其演变情况 ,暴雨区上空螺旋度的配置为上层负值、下层正值 ,30 0hPa以下为正的螺旋度 ,最大中心一般在 70 0～ 4 0 0hPa。

Helicity Analysis of Three Rainstorm Weather in East Part of Northwest China

Applying routine synoptic chart and standard isobaric surface grid point data of T106 NWP and calculating k-helicity,three heavy rain in east part of northwest are analysed. The results show that different weather system has different helicity tribute . over the area of heavy rain, there is positive helicity value on higher level, and negative value on lower level. Under 300hPa,there is positive value,the maximum value is on the level of 700-400hPa.