 In the early hours of October 9 the JTWC upgraded the storm to a tropical cyclone.The same day, the IMD upgraded the storm to a deep depression, and subsequently a cyclonic storm, naming it "Phailin".Rapid intensification ensued, and Phailin strengthened into a Very Severe Cyclonic storm on October 10, followed by the JTWC upgrading the storm to a strong Category 4 status.