https://phys.org/news/2018-10-nasa-tracks-tropical-storm-yutu.html

Tropical Depression 31 developed on Monday, Oct. 22 at 2 a.m. CHST (Guam local time) and rapidly intensified into a tropical storm.

On Oct. 22, the Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard NASA-NOAA's Suomi NPP satellite passed over Yutu and captured a visible image of the storm. VIIRS showed an organized storm with strong thunderstorms circling the center and in bands feeding into the center from the south and east.