 The Japan Meteorological Agency began monitoring the system as a tropical depression the next day.The depression continued to organise and strengthen, and the Joint Typhoon Warning Center issued a Tropical Cyclone Formation Alert on it during the afternoon of September 12, and began issuing advisories on Tropical Depression 12W an hour later.The JMA followed suit early on September 13 and initiated advisories on the system; PAGASA named the system Falcon shortly after.