The southwestern air currents slowed Morakot's progress across Taiwan, with the Central Weather Bureau forecasts of 1,000 millimeters of rain being upgraded eventually to 2,900 mm.
西南氣流的牽引，讓莫拉克在台灣上空緩步慢行，氣象局的預估雨量從 1,000 毫米 7 度上修到 2,900 毫米。