According to the National Center for Hydro-Meteorological Forecasting, northern Vietnam on July 8 was under the influence of a low-pressure trough with its axis extending across the region.

Quang Ninh, Hai Phong, the coastal area of Hung Yen and Ninh Binh were also affected by a low-pressure circulation that developed over northern Vietnam, generating a band of rapidly developing convective clouds along the eastern coastline.

The waterspout observed off the coast of Hung Yen, in the area formerly belonging to Thai Binh Province, developed within this zone of intense convection associated with the low-pressure trough.

In earlier weather forecasts and warning bulletins, the National Center for Hydro-Meteorological Forecasting had already warned of thunderstorms over the coastal waters of the Gulf of Tonkin, with the potential for waterspouts, strong wind gusts and high waves.

Forecasters expect the low-pressure trough across northern Vietnam to remain active through July 11, bringing moderate to heavy rainfall across the northern midlands, mountainous provinces and Quang Ninh.

Over the next two days, the Gulf of Tonkin is expected to continue experiencing strong thunderstorms. The meteorological agency has advised residents and vessels operating at sea to remain alert for squalls, waterspouts, strong wind gusts and other hazardous weather conditions.

Bao Anh