The ministry said that the water levels may rise beyond control lines in some rivers.
On Wednesday, Chinese foreign ministry spokesperson Mao Ning rebuked U.S. ambassador to China Nicholas Burns for blaming China for blocking bilateral exchanges.
It may move southwestward from the coastal areas near the middle parts of Guangdong, the NMC said.
Videos showed streets turning into raging rivers with masses of mud and parked cars being swept away.
China upgraded the typhoon alert to orange as Muifa, the 12th typhoon this year, is expected to make landfall in Zhejiang Province on Wednesday.
