春季寒潮天气过程诊断分析

Diagnostic Analysis of Cold Wave Weather in Spring of Shiyan City in Hubei

利用Micaps处理客观分析、数值预报、卫星云图以及自动气象站等资料,对2001年4月8～10日发生在十堰市历史罕见的寒潮天气过程进行分析探讨,结果表明:新地岛以西高空小槽引导极地冷空气不断南侵;垂直散度场、速度场配置与产生较大降水关系密切,寒潮过程中特征反映出与暴雨过程存在类似点;云图分析显示秦岭等大地形对北方冷空气南下速度存在阻挡作用,是预报这类天气的一个关键;槽底负涡度平流、槽前疏散场的正涡度平流是其动力因素,槽前暖平流提供了热力条件。

The Objective analysis Micaps processing,, numerical weather prediction, satellite images, and automatic weather stations, etc. , a analysis of the process of cold wave rare historical on 8 - 10 April 2001 in Shiyan City, the results show that ： new earth island west of the high - altitude small groove in the guide polar cold air southward invasion; vertical divergence, configuration and have a greater velocity of precipitation is closely related to the process characteristics of cold and heavy rain reflected a similar point ; cloud of topographic analysis showed that the North of Qinling cold air southward there blocking speed is a key prediction of this type of weather; bottom of negative vorticity advection, trough the evacuation of the positive vorticity advection field is its power factor, provides a warm advection front of the trough thermal conditions.