Over the next couple of days, the system gradually developed further as it moved south-westwards, before the Naval Western Oceanography Center (NWOC) initiated advisories on the system and designated it as Tropical Cyclone 07P. Later that day, the FMS reported that the system had developed into a category one tropical cyclone on the Australian tropical cyclone intensity scale and named it Wasa, while it was located about 250 kilometers to the southwest of the Penhryn in the Northern Cook Islands.