Journal of Earth Science Research

By using statistical analysis methods such as empirical frequency distribution and quartile method, the temporal distribution and weather situation characteristics of Jinsahnling cloud sea from 2019 to 2021 are analyzed, and suitable meteorological conditions like temperature, humidity ,wind and precipitation are studied. The results show that: The average number of cloud sea is 13.7 frequencies per year. The number of cloud deck event is increasing.The 500 hPa high altitude situation field before the occurrence of the cloud sea can be divided into three types: high trough type, low vortex type, and westerly flow type. The suitable meteorological conditions for cloud sea are daily mean temperature isbetween 14.8 and 22.8 degree，daily mean humidity is between 73.0 and 81.0%, daily mean pressure is between 966.1 and 975.9 hPa, daily 2 m wind speed is between 0.8 and 1.2 m/s. Compared with no cloud sea days，the temperature factor is higher，the relative humidity condition is better，and the pressure is lower , the wind speed is smaller. On the very day or the day before the appearance of the cloud sea, it always tends to rain.

Cloud sea; Time variation; Weather classification; Meteorological conditions