Typhoon Detection of Radar Improved Using Ultra Low Elevation Angle

Using the ultra-low-elevation angle data of changle radar,the ultra-low-elevation of typhoon 'Haitang' and 'Jangmi' and difference of PPI echo with 0.5° elevation angle are analyzed.The obtained results are as follows:(1) It can improve the remote detection,judge the construction and evolution of typhoon.(2) It can help to forecast the intensity and development of typhoon,improve the early warning system and nowcasting.(3) It can help to find out the development and change of typhoon cloud system.For the typhoon 'Jangmi',comparing with 0.5° elevation angle,the remote detection area has been enhanced for 1.09 times,the total estimated precipitation increase between 2.1%～7.9%.Ultra-low-elevation angle can improve the weakness of routine scan way on detecting ability of remote low radar echo.In the meantime,the ultra-low-elevation angle is also vulnerable to detect the impact of close-wave clutter,judgment the construction of typhoon can be interfered sometimes.Through radar detecting of typhoon the 'Haitang' and 'Jangmi',the ultra-low-elevation angle can improve the remote detection and early warning of typhoon.