On December 16, the Japan Meteorological Agency started issuing public bulletins on a tropical depression southwest of Guam. The Joint Typhoon Warning Center initiated warnings on Tropical Depression 26W the next day, despite having not issued a Tropical Cyclone Formation Alert. The system was upgraded to a tropical storm by the JMA and named Trami, which is a kind of rose tree. This name was submitted by Vietnam. The storm moved west-northwest rapidly towards the Philippines, but struggled against wind shear and an approaching cold front. Entering the PAGASA Area of Responsibility on December 18 as it maintained minimal tropical storm intensity, it was named Tomas. The JTWC issued its final warning later that day, having never upgraded the storm to tropical storm strength, citing no indication of a significant low-level circulation centre. On December 19, the JMA downgraded the storm to a tropical depression and issued its last public bulletin as the storm dissipated over water.