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of EASM, we divided the process of EASM's movement into the following
five phases:
1. The EASM's onset and its front concentrates in South China
On average, the Asian summer monsoon breaks out in SCS at 28th pentad.
During the 28th and 29th pentad, the front stays at South China Sea (SCS)
and nearby Philippine and moves northward and eastward continually. The
rain belt over East China is influenced by the southwesterly flows from
SCS and the cold air from mid-high latitude and start retreat southward
to South China, but the rainfall over South China increase rapidly. As
the strong westerly flows from the Indian Ocean and southeasterly flows
from the south of West Pacific subtropical high meet in SCS and then they
move northward during the 30th-32nd pentad, the front of EASM reaches
South China and stays there steadily (Fig. 2(a)). Meantime, Pre-flood Rainy
Fig. 2. The distribution of the mean wind (850 hPa) and EASM's index averaged for
1958-2001. (a) 30th-32nd Pentad, (b) 33rd-35th Pentad, (c) 36th-37th Pentad, (d) 38th-
40th Pentad, (e) 41st-43rd Pentad, and (f) 46th-47th Pentad.
 
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