The National Meteorological Centre warned that 24-hour rainfall levels across eastern China could reach around 250-320 millimetres from Friday afternoon to Saturday afternoon.
Erick, rated a Category 1 hurricane, is the season's third hurricane and potentially could grow to a Category 3, but is expected to weaken again before reaching Hawaii.
After briefly becoming a Category 1 hurricane, the system weakened to a tropical storm as it made landfall near Intracoastal City, about 257km (160 miles) west of New Orleans, the National Hurricane Center said.
Forecasters say the tropical storm could have winds of about 120 km per hour when it comes ashore, making it a Category 1 storm.
International donors last month pledged $1.2 billion after the poor southern African country was battered by two powerful cyclones in March and April this year.
Vayu, which is now classified as a very severe cyclonic storm, is expected to hit Gujarat state early on Thursday. Authorities are trying to evacuate close to 300,000 people living in coastal areas.
UN Secretary-General Antonio Guterres called for a "generous response" from the international community to help Mozambiquans after Cyclone Kenneth and Idai, the worst environmental disasters ever experienced in Africa.
With reconstruction moving slowly, residents of the US Virgin Islands express their fears that they are unprepared if there was a new hurricane.
Indian weather service says cyclone Fani is expected to make landfall on Friday afternoon in Odisha state and barrel northeastwards on a pathway close to the homes of more than 100 million people.
Cyclone Kenneth packed the power of a Category 4 hurricane as it approached Mozambique, the Joint Typhoon Warning Center said. The government said it evacuated around 30,000 people before the storm.
Torrential rains were expected to continue into Thursday and floodwaters were still rising, according to aid groups trying to get food, water and clothing to desperate survivors.
Evacuees were being moved by air and road on Thursday from remote, mostly indigenous communities on the Northern Territory's east coast to the territory's capital, Darwin.
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