The higher correlation between the forecasts and the observed rainfalls are also in the up-slope area.The orographic forcing has an effect to induce the systematic rainfalls.

• 从平均法对降水量的预测也显示，迎风面地区之台风降水预测准确度较背风面地区之预测准确度为高，显示地形强迫作用有助于在台风来袭时产生系统性的降水。