 Early on 1 December, the Japan Meteorological Agency (JMA) upgraded it to a tropical depression, and so did the JTWC designating it as "22W".Only six hours later, the JMA upgraded the system to a tropical storm and named it "Hagupit", as well as the JTWC, owing to a consolidating low-level circulation center (LLCC) with tightly curved banding wrapping into the system.However, the RSMC best track data indicated that the system had been already a tropical depression since 30 November and a tropical storm early on 1 December.