Abstract:Low-altitude flight activities are highly susceptible to complex wind fields, so civil aviation me-teorological departments place significant emphasis on refined monitoring and early warning technologies of low-altitude winds. This study analyzes a cold front strong wind case at Guanghan Airport on 26 December 2021, by using the data from Doppler wind lidar and airport automatic observation equipment, as well as reanalysis data. The results indicate that the Doppler wind lidar can clearly capture that during the influence of cold air, surface strong winds occur approximately 4-6 h after the low-level jet weakens, with significant in homogeneity in downward momentum transfer and vertical motion changes. Sinking motion enhances the downward momentum transfer of the low-level jet, which result in increased surface wind speeds, while upward motion hinders downward momentum transfer, leading to intermittent surface strong winds. The 12° PPI scanning of the Doppler wind lidar can provide early warnings of potential strong winds along the glide path and at the surface 1.0-1.5 h in advance. The intrusion of residual cold air behind the front in the study case caused a secondary wind event, which should be taken into account when forecasting strong winds. This study demonstrates that Doppler wind lidar can significantly improve the monitoring precision of low-altitude wind field evolution, and could provide valuable insights for ensur-ing the safety and efficiency of low-altitude flight operations.