https://phys.org/news/2018-12-gpm-heavy-rainfall-tropical-cyclone.html

On December 12, 2018 at 0047 UTC (Dec. 11 at 7:47 p.m. EST) Owen's maximum sustained winds had increased to about 55 knots (63 mph) when the Global Precipitation Measurement mission or GPM core observatory satellite scanned the western side of the tropical cyclone. This wind speed meant that Owen's intensity had reached the equivalent of a strong tropical storm on the Saffir-Simpson hurricane wind scale.

GPM's Microwave Imager (GMI) and GPM's Dual-Frequency Precipitation Radar (DPR) instruments collected data showing that extremely heavy rainfall was occurring in the Arafura Sea well to the northwest of Owen's center of circulation. GPM's GMI indicated that rain in that area was falling at a rate of over 97 mm (3.8 inches) per hour. West of Owen's center, rainfall was occurring at a rate as high as 40 mm (1.5 inches) per hour.