Typhoon In-Fa has made landfall on China's densely-populated eastern coast.
The national observatory earlier issued an orange alert for rainstorms.
They've also warned of storm surges and high waves.
Officials have launched emergency response operations and flood prevention measures.
Heavy rain is expected in Shanghai, Zhejiang, Jiangsu and Anhui.
Now all flights of Shanghai's Pudong and Hongqiao airports have been canceled.
All high-speed trains coming in and out of Shanghai will also be suspended between 7 p.m. today and midday tomorrow.
Parts of Shanghai's subway will run at reduced speed.
Many scenic areas have been closed.
In Fujian province, over 13,000 people have been relocated to safer ground.
Some rail services have been suspended.