Tropical Depression Twenty Five (TD25W) also formed today. It was located east of Guam and is predicted by the Joint Typhoon Warning Center (JTWC) to move toward the west-northwestward and pass to the north of Guam. TD25W is expected to become a typhoon with maximum sustained winds of 75 kt (86 mph) on October 18, 2015. The GPM core observatory satellite saw TD25W on October 13, 2015 at 1313 UTC. GPM found that TD25W contained moderate to heavy rainfall falling at a rate of up to 67 mm (2.6 inches) per hour.

A 3-D image was made using GPM's Dual-Frequency Precipitation Radar (DPR) data where the Ku Band data sliced through the western side of the tropical depression.