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 showed hot towers, some reaching as high as 9.3 miles (15 km) high (shown in orange tops) Credit: NASA/JAXA, Hal Pierce