Schools have been closed and public events cancelled.
“We don’t have much time left. The storm is intensifying, so our responses must be stronger and faster,” Prime Minister Pham Minh Chinh said at an emergency disaster response meeting on Tuesday, according to Reuters.
Evacuation, he said, must take place “as soon as possible”.
Approximately 270,000 military personnel have been placed on standby, the government said in a statement.
In Danang and Quang Nam provinces, a curfew will be in effect starting Tuesday evening. It forbids people from venturing out except those on official duty, the TV station reported.
Flights at five regional airports have been cancelled and train service halted until the typhoon passes.
The weather agency said Noru, which is expected early on Wednesday, had recorded maximum sustained winds of 180km/h (111 mph).
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Authorities have urged 400,000 people to leave their homes, including in the popular tourist city of Hoi An.