Affected jointly by the factors mentioned above, the low-level geopotential height lowers over the Arabian Sea, thus the negative meridional geopotential gradient strengthens and the westerly develops.

• 在以上因素的共同作用下,阿拉伯海对流层低层位势高度降低,负的经向位势梯度增大,导致西风增长,同时增强了的阿拉伯半岛热低压也引导西风向东加速,导致印度夏季风在第31候爆发。