A 3-D Look at the Rain in Developing Tropical Storm Matthew

GPM captured an image of the wave on Sept. 27 at 4:41 p.m. EDT as it was approaching the Windward Isles. The data showed rain rates derived from GPM's GMI microwave imager (outer swath) and dual-frequency precipitation radar or DPR (inner swath) overlaid on enhanced VIS/IR data from the GOES-East satellite. The wave contains a broad area of light rain (blue areas) with several embedded bands of moderate rain (green areas) containing relatively scattered areas of heavier rain (dark red areas). The data also