The overall set in Malacca straight is to the NW, but from May to September there is a tendency for SE sets to prevail in some N and central parts.In this sentence,“set”refers to().
Depths in the routes (Malacca and Singapore Straits) vary between 20m and about 23m but there are many areas of sand waves and depths are liable to change. The statement infers that().
Between April and November, squalls()as Sumateras()in Malacca Strait in the late afternoon or overnight and()E to affect the W coast of Malaysia and Singapore Island.
Malacca Strait is 805 km()and()from 64 km in the S to 257 km in the N.