 Though land interaction with the Philippines did not significantly affect the cyclone, a shortwave trough forced Nanmadol to sharply curve northward, bringing it into hostile atmospheric conditions within the Luzon Strait.At 0000 UTC on December 3, the JMA downgraded Nanmadol to severe tropical storm status.Increased wind shear and the advection of dry air further weakened the tropical cyclone, and by midday on December 3, the storm's center of circulation became decoupled from the rest of the convection.