 The depression subsequently started to move north-westwards towards the island nation of Tuvalu, under the influence of a subtropical ridge of high pressure.The system subsequently passed in between the islands of Wallis and Futuna, as a tropical depression during April 19.Early on April 20, the JTWC initiated advisories on the system and designated it as Tropical Cyclone 20P, while the system was located about to the west of Avata, Samoa.