To evaluate the detection and early warning capabilities of the FC-III wind lidar developed by the Southwest Institute of Technical Physics in actual operational applications, the automatic observation stations data and the wind lidar detection data at Lhasa Gonggar Airport were used to analyze the characteristics of a clear-air low-level wind shear event that occurred on June 3, 2023. The results show that the low-level wind shear event was primarily caused by the combined effects of downward transport of momentum from upper-level winds, afternoon surface heating, and intensified turbulence. During this operational mission, the FC-III wind lidar effectively detected the horizontal position, vertical height and intensity distribution of wind shear. It was able to detect the changes of environmental wind field near the airport 10 minutes before the start of wind shear. The monitoring results were also largely consistent with the wind shear conditions reported by the flight crew, demonstrating the potential of wind lidar to monitor and provide early warnings for low-level wind shear at high-plateau airports.