What is the big white ball on the mountain north of Jiaxiang?

Doppler weather radar. Doppler weather radar is an active remote sensing detection tool, which has important applications in measuring the internal factors of the occurrence and development of clouds, rainfall and various severe convective weather. Its working principle is based on Doppler effect, which can measure the velocity of scatterer relative to radar and reflect the vertical velocity distribution and turbulence of atmospheric wind field and airflow under certain conditions. This is of great significance to the early warning of severe convective weather.