利用宁波机场地面气象观测资料和NCEP/FNL 1˚ × 1˚再分析资料对2024年2月21~22日宁波机场出现的一次强对流天气过程进行分析,结果表明:此次过程是一次典型的高架雷暴,发生在地面冷锋后部。近地层大气层结稳定,低层有一明显逆温层,...利用宁波机场地面气象观测资料和NCEP/FNL 1˚ × 1˚再分析资料对2024年2月21~22日宁波机场出现的一次强对流天气过程进行分析,结果表明:此次过程是一次典型的高架雷暴,发生在地面冷锋后部。近地层大气层结稳定,低层有一明显逆温层,西南暖湿气流从逆温层顶开始抬升。过程发生时,中高层为高空槽前强盛的西南急流控制,配合850 hPa槽线和锋区。低层暖湿空气沿冷垫之上的强锋区做斜升运动,以及强的环境风垂直切变,均有利于强对流天气的触发、发展和维持。前期的降水、强盛西南急流源源不断的水汽输送,以及水汽局地的辐合,为此次过程提供了充足的水汽。To analysis the process of a severe convective weather that occurred at Ningbo Airport in February 21~22, 2024, by using surface meteorological observation data of Ningbo Airport and NECP/FNL 1˚ × 1˚ reanalysis data. The results show that this process is a typical elevated thunderstorm that occurred behind the surface cold front. The atmospheric stratification is stable near the surface layer, and there is an obvious inversion layer in the lower atmosphere. The warm and humid southwest airflow rises from the top of the inversion layer. When the process occurs, the middle and upper levels are controlled by the strong southwest jet stream in front of the high-level trough, with the trough line and frontal zone at 850 hPa. The inclined upward movement of low-level warm and humid air along the strong frontal zone above the cold air cushion and the strong vertical shear of environmental winds, are conducive to the triggering, development, maintenance and of severe convective weather. The precipitation in the early stage, continuous water vapor transport from the strong southwest jet stream, and local convergence of water vapor provided sufficient water vapor for this process.展开更多
利用常规观测资料、NCEP/FNL再分析资料、多普勒雷达资料等,对2023年8月16日厦门市的雷暴天气进行分析,结果表明:此次雷暴天气发生在冷涡后部西北气流中,高低空温度差动平流加强了不稳定层结,高CAPE值和0~6 km弱垂直风切下,在阵风锋与...利用常规观测资料、NCEP/FNL再分析资料、多普勒雷达资料等,对2023年8月16日厦门市的雷暴天气进行分析,结果表明:此次雷暴天气发生在冷涡后部西北气流中,高低空温度差动平流加强了不稳定层结,高CAPE值和0~6 km弱垂直风切下,在阵风锋与海风锋碰撞区域形成脉冲风暴,具有爆发性强对流的典型特征。触发的新生对流沿着海风锋自东北向西南发展加强给闽南地区带来较大范围、较长时间的强降水天气;通过此次雷暴个例分析可知,沿海地区的预报员加强地面辐合线推移和演变的监测,一定程度上可以提前判断出多条辐合线碰撞触发新生对流,由此对此类强对流天气提前作出预报决断。Using conventional observation data, NCEP/FNL reanalysis data, Doppler radar data, etc., an analysis was conducted on the thunderstorm weather in Xiamen on August 16, 2023. The results showed that the thunderstorm occurred in the northwest airflow behind the cold vortex, and the high and low altitude temperature differential advection strengthened the unstable stratification. Under high CAPE values and weak vertical wind shear of 0~6 km, a pulse storm was formed in the collision area between the gust front and the sea breeze front, with typical characteristics of explosive strong convection. The newly triggered convection develops and strengthens along the sea breeze front from northeast to southwest, bringing large-scale and long-term heavy precipitation weather to the southern Fujian region. Through the analysis of this thunderstorm case, it can be seen that forecasters in coastal areas can strengthen monitoring of the movement and evolution of ground convergence lines, which can, to some extent, predict in advance the collision of multiple convergence lines triggering new convection, and thus make forecast decisions for such severe convective weather in advance.展开更多
文摘利用宁波机场地面气象观测资料和NCEP/FNL 1˚ × 1˚再分析资料对2024年2月21~22日宁波机场出现的一次强对流天气过程进行分析,结果表明:此次过程是一次典型的高架雷暴,发生在地面冷锋后部。近地层大气层结稳定,低层有一明显逆温层,西南暖湿气流从逆温层顶开始抬升。过程发生时,中高层为高空槽前强盛的西南急流控制,配合850 hPa槽线和锋区。低层暖湿空气沿冷垫之上的强锋区做斜升运动,以及强的环境风垂直切变,均有利于强对流天气的触发、发展和维持。前期的降水、强盛西南急流源源不断的水汽输送,以及水汽局地的辐合,为此次过程提供了充足的水汽。To analysis the process of a severe convective weather that occurred at Ningbo Airport in February 21~22, 2024, by using surface meteorological observation data of Ningbo Airport and NECP/FNL 1˚ × 1˚ reanalysis data. The results show that this process is a typical elevated thunderstorm that occurred behind the surface cold front. The atmospheric stratification is stable near the surface layer, and there is an obvious inversion layer in the lower atmosphere. The warm and humid southwest airflow rises from the top of the inversion layer. When the process occurs, the middle and upper levels are controlled by the strong southwest jet stream in front of the high-level trough, with the trough line and frontal zone at 850 hPa. The inclined upward movement of low-level warm and humid air along the strong frontal zone above the cold air cushion and the strong vertical shear of environmental winds, are conducive to the triggering, development, maintenance and of severe convective weather. The precipitation in the early stage, continuous water vapor transport from the strong southwest jet stream, and local convergence of water vapor provided sufficient water vapor for this process.
文摘利用常规观测资料、NCEP/FNL再分析资料、多普勒雷达资料等,对2023年8月16日厦门市的雷暴天气进行分析,结果表明:此次雷暴天气发生在冷涡后部西北气流中,高低空温度差动平流加强了不稳定层结,高CAPE值和0~6 km弱垂直风切下,在阵风锋与海风锋碰撞区域形成脉冲风暴,具有爆发性强对流的典型特征。触发的新生对流沿着海风锋自东北向西南发展加强给闽南地区带来较大范围、较长时间的强降水天气;通过此次雷暴个例分析可知,沿海地区的预报员加强地面辐合线推移和演变的监测,一定程度上可以提前判断出多条辐合线碰撞触发新生对流,由此对此类强对流天气提前作出预报决断。Using conventional observation data, NCEP/FNL reanalysis data, Doppler radar data, etc., an analysis was conducted on the thunderstorm weather in Xiamen on August 16, 2023. The results showed that the thunderstorm occurred in the northwest airflow behind the cold vortex, and the high and low altitude temperature differential advection strengthened the unstable stratification. Under high CAPE values and weak vertical wind shear of 0~6 km, a pulse storm was formed in the collision area between the gust front and the sea breeze front, with typical characteristics of explosive strong convection. The newly triggered convection develops and strengthens along the sea breeze front from northeast to southwest, bringing large-scale and long-term heavy precipitation weather to the southern Fujian region. Through the analysis of this thunderstorm case, it can be seen that forecasters in coastal areas can strengthen monitoring of the movement and evolution of ground convergence lines, which can, to some extent, predict in advance the collision of multiple convergence lines triggering new convection, and thus make forecast decisions for such severe convective weather in advance.
