on october 7, the jtwc started monitoring a tropical disturbance about 750 km (465 mi) to the south of hagåtña, guam. over the next couple of days the system gradually developed further while moving towards the west. the jma reported on october 9, that the disturbance had become a tropical depression. early on october 10, the jtwc upgraded the system to a tropical depression called "23w". the pagasa also upgraded it to a tropical depression and named it "ramon". on october 11, the jma and the jtwc upgraded the system to a tropical storm and named it "banyan". early on october 12, banyan made landfall over leyte, philippines. the jtwc downgraded it to a tropical depression. a half day later, the jma also downgraded banyan to a tropical depression. the system dissipated in the south china sea on october 16.