天津市北辰地区冰雹发生规律及预警指标初步分析

Preliminary Analysis of Hail Occurrence Regularity and Warning Index in Beichen Area of Tianjin

利用2008-2017年天津市北辰气象站历史冰雹资料,分析了冰雹预警指标和冰雹云雷达回波特征。应用统计分析方法,得出北辰地区冰雹天气时间分布特征;归纳冰雹发生的天气形势,得出结论为影响北辰地区冰雹的天气形势可分为高空冷涡型、高空槽型和西北气流型;目前冰雹的年际变化逐年减少,月际变化呈单峰分布,大部分出现在午后到次日凌晨。

Based on the historical hail data of Beichen District Meteorological Bureau from 2008 to 2017, the hail warning indexes and hail cloud radar echo characteristics are analyzed. The time distribution characteristics of hail weather in Beichen District are obtained by using statistical analysis method. The weather conditions of hail occurrence are summarized. It is concluded that the weather conditions affecting hail in Beichen District can be divided into high-altitude cold vortex, highaltitude trough and northwest airflow. The interannual changes of the hail are decreasing year by year, and the monthly changes are unimodal, most of hail appear in the afternoon to the early morning.