https://phys.org/news/2018-07-gpm-satellite-tropical-cyclone-son-tinh.html

At the time GPM passed overhead, Son-Tinh was still a tropical depression. It was close to the northern Philippines on July 16, 2018 at 4:51 a.m. EDT (0851 UTC). GPM is a joint mission between NASA and the Japan Aerospace Exploration Agency, JAXA.

Data collected by GPM's Microwave Imager (GMI) and Dual-Frequency Precipitation Radar (DPR) instruments showed that the tropical cyclone was relatively small but was dropping moderate to heavy rain over much of the northern Philippine island of Luzon.