Analysis of a Large-scale Cold Wave Weather Process in Qinghai on November 6,2021
Using the data of ground observation and NCEP reanalysis,this article analyzes a large-scale cold wave weather process in Qinghai on November 6,2021.The results show that after the horizontal trough turns vertical,the northwest airflow behind the trough almost controls the entire Qinghai Province,and there is a dense distribution of isotherms over the province.The angle between the wind direction and the isotherm exceeds 90 °,indicating that cold air affects Qinghai Province.Compared with previous cold wave weather processes,the cooling range of this cold wave in Qinghai Province is relatively large and has a wide range of impacts.The 24-hour variable pressure in most areas of Qinghai Province is mainly positive,and cold air has invaded and had an impact on most areas of Qinghai Province.The abnormal warming and cold advection in the early stage controlled the entire Qinghai region,indicating that the intensity of cold air was relatively high,leading to cold waves,weak snowfall,and cold wave weather.For the prediction of cold wave weather,it is necessary to focus on the accumulation of cold air,the outbreak of cold waves,the intensity of cold waves,and the focus of cold wave path prediction.
Cold wave weatherCirculation backgroundForecast focusQinghai Province
NETL
NSTL
万方数据
