Two cold vortex weather processes in Liaoning Province in June of 2006 were analyzed.In the process of low vortex of June 3,strong convection weather,such lightning storm and hailstone,came forth in most areas of Liao...Two cold vortex weather processes in Liaoning Province in June of 2006 were analyzed.In the process of low vortex of June 3,strong convection weather,such lightning storm and hailstone,came forth in most areas of Liaoning Province.White and bright cloud was shown in satellite nephogram.Bow echo and cyclonic circumfluence were shown in weather radar production.In the process of low vortex of June 14,strong precipitation weather came forth in most area of Liaoning Province.Based on the velocity field production of weather radar,the relative place of front and radar station can be judged.The weather situation and forecast were the main basis of short-term prediction.And satellite nephogram,weather radar,automatic weather station play important roles in the monitoring and short-term prediction of disaster weathers.展开更多
为了更好地为农业生产预防冰雹、减少灾害损失提供有效的气象预报服务,利用多种气象观测资料,对2013年5次典型强对流天气进行了综合分析。结果表明:(1)冰雹发生在高能、高湿以及较强抬升条件的有利天气背景下,大尺度强迫抬升、低层中尺...为了更好地为农业生产预防冰雹、减少灾害损失提供有效的气象预报服务,利用多种气象观测资料,对2013年5次典型强对流天气进行了综合分析。结果表明:(1)冰雹发生在高能、高湿以及较强抬升条件的有利天气背景下,大尺度强迫抬升、低层中尺度露点锋和地面辐合线是强对流天气的重要触发机制。(2)冰雹极易发生在午后,SI明显减小,Ki指数、500 h Pa与850 h Pa温差以及CAPE明显增大,同时垂直风切变较大、0℃和-20℃层高度分别在600 h Pa和400 h Pa左右的情况下,湿度条件较好时会伴随短时强降水天气,强气流控制下常伴随雷暴大风。(3)冰雹常出现在对流云团成熟时、TBB等值线梯度最大值东南侧,且组合反射率因子强度>55 d BZ的对流单体内。(4)地面温度异常变化、气压梯度较大、风向顺时针旋转及风速极值同时出现,可视为强对流天气发生前的一种信号。展开更多
文摘Two cold vortex weather processes in Liaoning Province in June of 2006 were analyzed.In the process of low vortex of June 3,strong convection weather,such lightning storm and hailstone,came forth in most areas of Liaoning Province.White and bright cloud was shown in satellite nephogram.Bow echo and cyclonic circumfluence were shown in weather radar production.In the process of low vortex of June 14,strong precipitation weather came forth in most area of Liaoning Province.Based on the velocity field production of weather radar,the relative place of front and radar station can be judged.The weather situation and forecast were the main basis of short-term prediction.And satellite nephogram,weather radar,automatic weather station play important roles in the monitoring and short-term prediction of disaster weathers.
文摘为了更好地为农业生产预防冰雹、减少灾害损失提供有效的气象预报服务,利用多种气象观测资料,对2013年5次典型强对流天气进行了综合分析。结果表明:(1)冰雹发生在高能、高湿以及较强抬升条件的有利天气背景下,大尺度强迫抬升、低层中尺度露点锋和地面辐合线是强对流天气的重要触发机制。(2)冰雹极易发生在午后,SI明显减小,Ki指数、500 h Pa与850 h Pa温差以及CAPE明显增大,同时垂直风切变较大、0℃和-20℃层高度分别在600 h Pa和400 h Pa左右的情况下,湿度条件较好时会伴随短时强降水天气,强气流控制下常伴随雷暴大风。(3)冰雹常出现在对流云团成熟时、TBB等值线梯度最大值东南侧,且组合反射率因子强度>55 d BZ的对流单体内。(4)地面温度异常变化、气压梯度较大、风向顺时针旋转及风速极值同时出现,可视为强对流天气发生前的一种信号。
