Figure 1. The top images are from passive microwave data for western Pacific Typhoon Imbudo (2003) at 0942 Z July 20 and at 2219 Z July 20 (image courtesy of Naval Research Laboratory, Monterey, California). The bottom images are reflectivity at 0.5 elevation angle for Typhoon Lekima (2001) from the Central Weather Bureau WSR-88D (10 cm) radar at Kung-Ting at local time 0935 September 25 and 1935 September 25. The radial increment of the circles centered at the radar station is 50 km. The time interval of concentric eyewalls formation is approximately 12 hours in both cases.

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