HANOI, Vietnam (AP) — Vietnam braced for Typhoon Wipha on Monday as coastal provinces were placed on emergency alert and airlines canceled flights ahead of the storm’s expected landfall early Tuesday.

A sudden thunderstorm in Halong Bay, Vietnam, overturned a boat, killing at least 35 people and leaving four missing. Survivors describe how the storm capsized the vessel within seconds. The tragedy,

The thunderstorm came so suddenly that it overturned the boat within seconds, said two survivors of the shipwreck which killed at least 35 people in Vietnam's top tourist spot of Halong Bay and left another four missing.

State media in Vietnam have reported that 37 people were killed after a boat carrying tourists capsized during a sudden thunderstorm. Five people remain missing.

Travellers to Vietnam have been warned to “expect travel disruption” as a tropical storm approaches tourist hotspots on its northern coast. Storm Wipha is forecast to bring heavy rain, strong winds and flooding when it makes landfall on Tuesday.