@Figure shows typhoon No.18 observed by Precipitation Radar (PR) and TRMM Microwave Imager (TMI) on Sep 1999. As typhoon No.8 moved to north, sea surface temperature and rain areas were changed. Figure a) shows the horizontal distribution of rain rate near the surface (unit is mm/hr) observed by the Precipitation Radar (PR) aboard the TRMM satellite for Typhoon hBart h (No. 18) in September 1999. Typhoon Bart developed on September 19, and PR observed it five times as it passed near Japan. Organized rainfall distribution east of the Philippines was also observed by PR before the typhoon developed. The storm track of Typhoon Bart is shown as the red line in the figure, and red dots indicate the center of the typhoon at 0000UTC (0900JST) in each date. There are changes of rainfall distribution as the typhoon moved north, and heavy rainfall developed at the slope of mountains in Shikoku and Kyushu islands.
@Figures b, c, d, and e show variations of sea surface temperature (SST), retrieved from the TRMM Microwave Imager (TMI), related to the typhoon passage. Figures show 3 day-means, b) from September 13 to 15 (before the typhoon developed), c) from Sep.18 to Sep. 20 (just after the typhoon developed), d) from Sep 21 to Sep 23 (typhoon passing), e) from Sep. 23 to Sep. 25 (after typhoon passed). The red solid line indicates the past and present storm track of the typhoon in each figure, and the blue dashed line indicates future ones. It is clear that SST along the storm track decreased as the typhoon passed. In particular, the SST around the Southwest islands decreased about 3 degrees after the typhoon passed.