The coupling of a meso-scale low pressure and the divergence zone of an upper-level jet caused strong upward motion.
低层中尺度低压环流的扰动,并与高空急流南侧的辐散区耦合,产生强烈的上升运动;
Europe-Asia circulation position between middle and high latitudes, is two ridges-one trough, there is a low trough in the middle of Asia. The most severe successively heavy rainfall event in the summer 2004 was caused by upper-level trough on 15& 20 July.
亚欧中高纬环流形势为两脊一槽型,亚洲中部为一低压槽;夏季最强的一次降雨过程(7月15~20日)是高空低压槽前的持续性暴雨。
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