Draft:Typhoon Choi-wan (2003)

Typhoon Choi-wan, known in the Philippines as Typhoon Roskas , was a powerful typhoon which paralleled Japan in September 2003. The 29th depression, 15th named storm, and 9th typhoon of the 2003 Pacific typhoon season, Choi-wan developed from (TBD)

Meteorological history
In mid-September 2003, the monsoonal trough spawned a tropical disturbance east-northeast of Luzon. At the time, the system was in an environment with low wind shear and favorable conditions, allowing the disturbance to rapidly develop. On 00:00 UTC on September 16, the Japan Meteorological Agency (JMA) would state that the disturbance had developed into a tropical depression. On 01:30 UTC the next day, the JTWC would first note the disturbance in the Philippine Sea, later issuing a Tropical Cyclone Formation Alert (TCFA) less than 12 hours later. On September 18, both the JMA and JTWC would recognize the system as a tropical storm, with the former naming it Choi-wan.

Choi-wan would be upgraded to a severe tropical storm on September 19 as it paralleled Japan, later peaking as a typhoon at 21:00 UTC on September 20. After that, Choi-wan would steadily weaken, becoming a severe tropical storm on September 22 and transitioning into an extratropical low the next day, resulting in the JTWC issuing their last advisory on the system. The JMA would monitor the system until it crossed the International Date Line later that day.